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fractint-digest        Thursday, April 16 1998        Volume 01 : Number 166




----------------------------------------------------------------------

Date: Tue, 14 Apr 1998 21:07:22 -0600
From: "Tim Wegner" <[e-mail]>
Subject: Re: (fractint) New Colormaps

Question: if we repair Fractint's color compression so that no color
is ever off by more than 4 out of 256, is there still a need for a
lossless option?

We could do both, but I never want to add a feature that isn't
really needed by anyone.

Thanks to Michael Bell and Sylvie Gallet for their suggestions.

Tim

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------------------------------

Date: Tue, 14 Apr 1998 23:04:41 -0400 (EDT)
From: [e-mail] (Kragen)
Subject: Re: (fractint) New down-load?

On Tue, 14 Apr 1998, Ray Montgomery wrote:
>         I've been running v19.3 Fractint for two years now.  It has been
> suggested that it is about time that I down-loaded the newer v19.6.  (Isn't
> that the latest version?)  I would like to, but it presents such a problem
> to my scant knowledge that I am somewhat reluctant to do so.  On top of
> which, I MAY get a new rig before too much longer and wonder if it makes
> sense to down-load now, or wait till I get the new computer.

Well, if you download it now, you can copy it over to the new computer
without having to download it again -- either with floppies, or over
a cable, or simply by sticking the old hard disk in the new computer.

>         If it makes sense to get the newer version now, (I may not even get
> a new computer) so that at least I have it, and even if I do get a new
> computer, it may be a while - so at least I'd be breaking in on it and be
> readier when the new computer was up and running.
>         And, above all, I don't know the procedures for this down-load.
> I've down-loaded before, (even a 50 or so page data-base of Van Gogh that I
> wanted).  But this is different.

Shouldn't be too different.

> Must I remove my OLD Fractint before I down-load the new one?

Not unless things have changed a lot since I last installed Fractint,
which was admittedly some time ago -- 19 November 1996, according to
the timestamps on the files :)  (It was version 19.5.)

Just create a new directory (also known as "folder") for the new version
of Fractint.

>   If I do, what do I do with all my personal
> treasure-trove (OK, junk to you - but they're "mine, all mine!!!") of images
> and pars and formulas and all like that?

You can leave them where they are and read them with the new Fractint,
or you can copy them to the new Fractint directory for convenience --
because I think Fractint normally looks in the directory it's started
in for its images, unless you navigate to somewhere else.

I suggest that, if you copy them to the new location, you delete them
from the old location once you've verified that the new copies are OK.
This is because, if you're like me, you'll modify your pars, colormaps,
etc., a bit from time to time, and if you have two copies of them, you
may end up with divergent modifications.  Or you may delete one copy to
save space, and it's the wrong copy.  Etc.

> So I'm dumb.  What can  I do but ask?

Not knowing stuff doesn't make you dumb!

Hope this helps.

Kragen


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------------------------------

Date: Tue, 14 Apr 1998 23:02:55 -0600
From: "Tim Wegner" <[e-mail]>
Subject: Re: (fractint) New Colormaps

Gedeon said:

> Not fully understanding what is meant by it I answer your question as
> follows. If "lossless option" means the retention of the .map format, my
> answer is a resounding yes. I would consider it's demise a great loss.

No, that's not what I meant. We will keep maps. What I have in mind is
a lossless variation of the current color compression as proposed by
Lee Skinner, and implemented by Michael Bell.

Consider the three PARs at the bottom of this message.

Test1 is how the current fractint encodes lyapunov.map. The statistics show
that the average root-sum-square (rss) error per color is 1.62, but worse, the
maximum error is 48 (out of 256!). This is a bad bug. Fortunately this is
unusual - the color compression usually works well, which is why we've heard
almost nothing about this for almost ten years.

Test2 is compression using Sylvie gallet's fix. The rss error drops to .11,
and the maximum error is 4, which is not bad.

Test3 exactly encodes lyapunov map. If you load test3, press <c> to go
into the cycling mode, press <s> to save the color map, you should get
a map identical to the original lyapunov.map.

Note that the test3 colors= values take much more space than the test2 colors=
values, but are still very much smaller than an actual map.

Now let me re-ask the question. If we fix fractint's color compression
so that test1 is gone and compression works like test2, would that be
sufficient, or for critical work would you like a "recordcolors=exact"
option that would result in test3? Without this option, the colors would still
be very accurate - it is hard to image a situation where a color error of 4
makes a difference.

Tim

test1              { ; debug=0  lyapunov.map - old algorithm
                     ; rss error 1.629126 count 256
                     ; max error rgb   4  48   0
  reset=1961 type=mandel center-mag=-0.5/0/0.6666667 params=0/0
  float=y colors=000zk0<253>000
  }

test2              { ; debug=910 lyapunov.map - Sylvie's 4/13/98 fix
                     ; rss error 0.113752 count 256
                     ; max error rgb   4   4   0
  reset=1961 type=mandel debug=910 center-mag=-0.5/0/0.6666667
  params=0/0 float=y colors=000zk0<189>G10G10F00<61>000
  }

test3              { ; debug=920
                     ;  Version 1961 Patchlevel 40
  reset=1961 type=mandel debug=920 center-mag=-0.5/0/0.6666667
  params=0/0 float=y
  colors=000zk0zk0zk0zk0yj0yj0yj0yj0xi0xi0xi0xi0wh0wh0wh0wh0vg0vg0vg0vg0uf\
  0uf0uf0uf0te0te0te0te0sd0sd0sd0sd0rc0rc0rc0rc0qb0qb0qb0qb0pa0pa0pa0pa0o`\
  0o`0o`0o`0n_0n_0n_0n_0mZ0mZ0mZ0mZ0lY0lY0lY0lY0kX0kX0kX0kX0jW0jW0jW0jW0iV\
  0iV0iV0iV0hU0hU0hU0hU0gT0gT0gT0gT0fS0fS0fS0fS0eR0eR0eR0eR0dQ0dQ0dQ0dQ0cP\
  0cP0cP0cP0bO0bO0bO0bO0aN0aN0aN0aN0`M0`M0`M0`M0_L0_L0_L0_L0ZK0ZK0ZK0ZK0YJ\
  0YJ0YJ0YJ0XI0XI0XI0XI0WH0WH0WH0WH0VG0VG0VG0VG0UF0UF0UF0UF0TE0TE0TE0TE0SD\
  0SD0SD0SD0RC0RC0RC0RC0QB0QB0QB0QB0PA0PA0PA0PA0O90O90O90O90N80N80N80N80M7\
  0M70M70M70L60L60L60L60K50K50K50K50J40J40J40J40I30I30I30I30H20H20H20H20G1\
  0G10G10G10F00F00F00F00E00E00E00E00D00D00D00D00C00C00C00C00B00B00B00B00A0\
  0A00A00A0090090090090080080080080070070070070060060060060050050050050040\
  0400400400300300300300200200200200100100100100000000000
 }


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------------------------------

Date: Wed, 15 Apr 1998 01:08:32 -0400
From: "Blake Hyde" <[e-mail]>
Subject: (fractint) Re: new download?

This didn't go thru the first (two) times...

>At 4/14/1998 3:52:00 PM, you wrote:
>>        I've been running v19.3 Fractint for two years now.  It has been
>>suggested that it is about time that I down-loaded the newer v19.6.  (Isn't
>>that the latest version?)  I would like to, but it presents such a problem
>>to my scant knowledge that I am somewhat reluctant to do so.  On top of
>>which, I MAY get a new rig before too much longer and wonder if it makes
>>sense to down-load now, or wait till I get the new computer.
>
>Get it now, and see which you like better.  That way you won't have to agonize
>over it when you get the new rig.  :)
>
>[snip - self convincing stuff]
>
>>        And, above all, I don't know the procedures for this down-load.
>>I've down-loaded before, (even a 50 or so page data-base of Van Gogh that I
>>wanted).  But this is different.  Must I remove my OLD Fractint before I
>>down-load the new one?  If I do, what do I do with all my personal
>>treasure-trove (OK, junk to you - but they're "mine, all mine!!!") of images
>>and pars and formulas and all like that?  So I'm dumb.  What can  I do but ask?
>
>Okies.  Make a new directory on your hard drive caled "FRACT196" or something
>similar, then go to Spanky and get the file from the homepage.  Save it into the
>new directory, and play with it a while.  If you like it better than your old
>version, move *.par, *.frm, and *.map to the new directory (this is the easiest
>way, believe me) and delete the old one--or you can delete the files needed by
>fractint in the old directory, move them there from the new directory, and
>delete the new directory.  *catches breath*  Any questions?  :)
>
>>        Does any of this make sense to anybody?  Would appreciate some
>>advice and suggestions.
>
>I've been through almost the same thing.  I wanted to change to an editor which
>I could use in many different situations, instead of relying on my all-purpose
>W95 editor, NotesPad.  I started shopping around, and saw the huge glut of W95
>editors out there.  I played around with WinVi, emacs, vim, and several others,
>and finally decided to go with vim--1.2 meg zip file, many features, freeware,
>and available for unix, w95, dos, win3, and mac.  Now I use vim for everything.
>Shameless plug:  I recommend that everybody visit www.vim.org, which is the
>home of the Greatest Editor to Ever Be Compiled Even Though It Is A Bit Obtuse.

~~~~~~Blake Hyde~~~~~~
  [e-mail]
~~~~~~~~~~~~~~~~~~~~~~
www.connectu.net/bhyde
~~~~~~~~~~~~~~~~~~~~~~

If this doesn't work this time, i'm killing my computer.

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------------------------------

Date: Tue, 14 Apr 1998 23:04:03 -0700 (PDT)
From: Jiho Kim <[e-mail]>
Subject: Re: (fractint) New Colormaps

> Now let me re-ask the question. If we fix fractint's color compression
> so that test1 is gone and compression works like test2, would that be
> sufficient, or for critical work would you like a "recordcolors=exact"
> option that would result in test3? Without this option, the colors would
> still be very accurate - it is hard to image a situation where a color
> error of 4 makes a difference.

> test3              { ; debug=920
>                      ;  Version 1961 Patchlevel 40
>   reset=1961 type=mandel debug=920 center-mag=-0.5/0/0.6666667
>   params=0/0 float=y
>   colors=000zk0zk0zk0zk0yj0yj0yj0yj0xi0xi0xi0xi0wh0wh0wh0wh0vg0vg0vg0vg0uf\
>   0uf0uf0uf0te0te0te0te0sd0sd0sd0sd0rc0rc0rc0rc0qb0qb0qb0qb0pa0pa0pa0pa0o`\
>   0o`0o`0o`0n_0n_0n_0n_0mZ0mZ0mZ0mZ0lY0lY0lY0lY0kX0kX0kX0kX0jW0jW0jW0jW0iV\
>   0iV0iV0iV0hU0hU0hU0hU0gT0gT0gT0gT0fS0fS0fS0fS0eR0eR0eR0eR0dQ0dQ0dQ0dQ0cP\
>   0cP0cP0cP0bO0bO0bO0bO0aN0aN0aN0aN0`M0`M0`M0`M0_L0_L0_L0_L0ZK0ZK0ZK0ZK0YJ\
>   0YJ0YJ0YJ0XI0XI0XI0XI0WH0WH0WH0WH0VG0VG0VG0VG0UF0UF0UF0UF0TE0TE0TE0TE0SD\
>   0SD0SD0SD0RC0RC0RC0RC0QB0QB0QB0QB0PA0PA0PA0PA0O90O90O90O90N80N80N80N80M7\
>   0M70M70M70L60L60L60L60K50K50K50K50J40J40J40J40I30I30I30I30H20H20H20H20G1\
>   0G10G10G10F00F00F00F00E00E00E00E00D00D00D00D00C00C00C00C00B00B00B00B00A0\
>   0A00A00A0090090090090080080080080070070070070060060060060050050050050040\
>   0400400400300300300300200200200200100100100100000000000
>  }

Can't we improve the test3 color par by compressing it a little?  I'm not
programming expert (yet), but there are lossless (or exact) compression
algorithms, right?  Maybe the we can begin the first character after
'colors=' with something that hasn't been used before in a color par to
signify to Fractint that it should use the exact uncompression procedure
instead of the normal. How about the back-slash? or comma, or semicolin.
Or you can end up with 'color=' spelled 'exactcolor=' or something just as
revealing.

The problem with idea is that it will complicate the code more.  The poor
programmers will have to have three sets of compression and decompression
codes.

My 2 yen worth

Jiho



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------------------------------

Date: Wed, 15 Apr 1998 08:54:56 -0400 (EDT)
From: [e-mail] (Kragen)
Subject: Re: (fractint) Re: new download?

On Wed, 15 Apr 1998, Blake Hyde wrote:
> Someone unattributed wrote:
> >I wanted to change to an editor which
> >I could use in many different situations, instead of relying on my all-
> >purpose > >W95 editor, NotesPad.  I started shopping around, and saw
> >the huge glut of W95 editors out there.  I played around with WinVi,
> >emacs, vim, and several others, and finally decided to go with vim--1.2
> >meg zip file, many features, freeware, and available for unix, w95,
> >dos, win3, and mac.  Now I use vim for everything.
> >Shameless plug:  I recommend that everybody visit www.vim.org, which is the
> >home of the Greatest Editor to Ever Be Compiled Even Though It Is A Bit
> >Obtuse.

vim is definitely the greatest editor to ever be compiled.  I use it
everywhere myself.

What I like best about it are the .swp files:
- - they keep me from accidentally opening the same file in two different editor
windows and making divergent changes, which is especially handy if I'm at work
and the other editor window is on my screen at home;
- - they keep me from losing more than a keystroke or two of work if I
accidentally yank the plug out of the wall, or shut down the machine without
remembering to save, or if it's a crashy machine.

However, vim is still vi -- the editor that someone remarked "has to hold
some sort of award for being hard to use."  The vi command set is about the
farthest thing I can imagine from being intuitive.  (Well, maybe TECO is
worse.  Maybe.)  It's not something I recommend to beginners.

Kragen


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------------------------------

Date: Wed, 15 Apr 1998 08:37:51 -0600
From: Ray Montgomery <[e-mail]>
Subject: (fractint) vim vs. TextPad

Hi Kragen

        Thanks for the advice.  It is greatly appreciated.  I'm working on
your suggestions now.
        Your response to the subject of vim was intriguing. The "obtuse"
from Blake Hyde was a sort of warning for me. Now you suggest, along with
Blake, that it is great but not for beginners.  Points well taken and
program "lost."
        How about a program that I've heard good things about called
Textpad, not in  comparison with vim, but just as an asset to have?
        Thanks again

                                                Ray


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------------------------------

Date: Wed, 15 Apr 1998 11:24:32 -0500 (Central Daylight Time)
From: "John J. Brassil" <[e-mail]>
Subject: Re: (fractint) vim vs. TextPad

Ray et al.,

Was he tasty?

I have been using vi since 87, and have been with Textpad since the 16-bit
days.   Both are great, but in very different ways.

vi and its various clones are all line editors, and have characteristics that
strongly show their derivation from ex, a unix text editor.   The big leap to
vi was that while you could only *edit* one line at a time, you could *see* a
whole screenful.

Because of this heritage, you have to get used to moving between command mode
and insert mode.   If you're cool with that, vi is the bomb.   Pattern
matching, named buffers, shortcuts, macros, the whole works.

Textpad, on the other hand, is a text editor built for a windowed
environment.   You can open bunches of files, cut 'n' paste, customize it out
the wazoo, etc.   You will never use notepad again.   And it's got enough in
common with the standard MS products that the learning curve isn't very
steep, especially for basic functionality.

You have some other choices, but I don't think you can go wrong with Textpad.

B

On Wed, 15 Apr 1998 08:37:51 -0600 Ray Montgomery <[e-mail]> wrote:

>
> Hi Kragen
>
>         Thanks for the advice.  It is greatly appreciated.  I'm working on
> your suggestions now.
>         Your response to the subject of vim was intriguing. The "obtuse"
> from Blake Hyde was a sort of warning for me. Now you suggest, along with
> Blake, that it is great but not for beginners.  Points well taken and
> program "lost."
>         How about a program that I've heard good things about called
> Textpad, not in  comparison with vim, but just as an asset to have?
>         Thanks again
>
>                                                 Ray
>
>
> -
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John J. Brassil | Network Engineer, Vanderbilt ACIS Networks | 615.322.2496



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------------------------------

Date: Wed, 15 Apr 1998 12:25:37 -0500
From: "Jon Camp" <[e-mail]>
Subject: (fractint) Question about posting PAR's

Hi! This my first time posting to the list and I want to make sure that any
PAR's i post are done in the correct manner. Is the best method just to copy
and past the PAR into the email? Thanks!


005                {  reset=1960 type=barnsleyj3
  center-mag=+0.07169604106416233/+0.00042805979123193/266.3553
  params=-0.3572349791475409/0.657971371476832 float=y maxiter=10000
  inside=zmag outside=imag
  colors=10E00O<2>00c00h00l00p00s00u00x00y00z00z<2>00x00u00s00p00l<2>00Z00\
  U00O<3>000<3>O00U00Z00c00h00l00p00s00u00x00y00z00z00<2>x00u00s00p00l00<2\
  >Z00U00O00<3>000<4>E00H00K00M00O00Q00<2>U00V00V00V00V00<2>T00S00Q00O00M0\
  0<4>900600300000100300<6>C01D01D01E01<5>F01F01E01<2>C01B01901<2>60040030\
  0100000<10>603703703703<5>703603603502502<5>100000000000<9>306307307307<\
  5>307306306205205<6>000000001<2>00600700810910B<3>10E10F10F10F<2>10F10F1\
  0D10D<5>006004003001000<4>00E00H00K00M00O00Q<2>00U00V00V00V00V<2>00T00S0\
  0Q00O00M<4>00900600300000600C00I  }


Jon Camp
Valparaiso University
Vist chaotic n-space network @
http://www.valpo.edu/home/student/jcamp/index.html


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------------------------------

Date: Wed, 15 Apr 1998 20:14:41 +0100
From: Michael Bell <[e-mail]>
Subject: Re: (fractint) New Colormaps

Tim Wegner wrote:
>
> Question: if we repair Fractint's color compression so that no color
> is ever off by more than 4 out of 256, is there still a need for a
> lossless option?
>
> We could do both, but I never want to add a feature that isn't
> really needed by anyone.
>
> Thanks to Michael Bell and Sylvie Gallet for their suggestions.
>
> Tim
>

Hi,

If we keep the map format (which I think we should) there is no need for
the lossless option as it doesn't compress much.  I think that just
using Sylvie's fix would be fine in this case.

Michael Bell.

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Date: Wed, 15 Apr 1998 12:37:19 -0700 (PDT)
From: Jiho Kim <[e-mail]>
Subject: Re: (fractint) New Colormaps

If Mr. Bell's suggestion is the consensus (which I think it will be), can
there be a warning to tell the user if there has been a lossy compression
when saving colors into a par?

Also, would uncompressed par colors compress into the same par?  Or would
its trueness to the original degrade further?  I'd test this out myself,
but I don't have Sylvie's new fix.  The implication, if this be true, is
that if you post pars, it'll be difficult to keep from degrading away
from the original.

Also about the compression algorithm itself...  Would it make sense to
compress each primary color separately?

Just random thoughts,

Jiho

> Hi,
>
> If we keep the map format (which I think we should) there is no need for
> the lossless option as it doesn't compress much.  I think that just
> using Sylvie's fix would be fine in this case.
>
> Michael Bell.



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------------------------------

Date: Wed, 15 Apr 1998 14:25:45 -0700
From: "John Wilson" <[e-mail]>
Subject: (fractint) Another Text Editor

Seems to be a lot of interest, but I haven't seen "NotesPad" by BremerCorp
mentioned.  This one does everything that those mentioned so far will
do...plus a lot more; including file conversions between Unix, DOS and Mac
text file formats.   The current version 8.0 readily replaces Windows
"Notepad", it's freeware, and no-one should be without it!   It's available
at most software download sites.

John Wilson  (no association with the company)



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------------------------------

Date: Wed, 15 Apr 1998 22:09:56 -0400
From: Gedeon Peteri <[e-mail]>
Subject: (fractint) 6 more gravijul

Regrettably I lost more precise documentation on the second formula. I
believe it is Mark Christenson's own variation, but I cannot be sure. I
would like to be corrected if I am wrong.

Gedeon

g-gj2-02           { ; (c) Gedeon Peteri, Apr 15, 1998
                     ;   0:00:40.20 on P166MMX at 1024x768
                     ; Sylvie Gallet's variation of
                     ; Mark Christenson's formula
  reset=1960 type=formula formulafile=gravijul.frm
  formulaname=gravijul-v2 function=sinh/log/log passes=1
  center-mag=4.44089e-016/-1.33227e-014/0.3723863/1.3141
  params=0/0.9/0/0/9/0 float=y maxiter=2047
  inside=0 decomp=256
  colors=rX8sY9uZ9<31>H91BMC<29>Zl__m`Zl_<30>BMCW21<27>\
  vNMwONxPOyPOxPOwON<29>W212IU<29>KevLfwLfv<29>3JV2IU000\
  H91<26>qW8 cyclerange=0/255
  }

g-gj2-03           { ; (c) Gedeon Peteri, Apr 15, 1998
                     ;   0:00:23.02 on P166MMX at 1024x768
                     ; Sylvie Gallet's variation of
                     ; Mark Christenson's formula
  reset=1960 type=formula formulafile=gravijul.frm
  formulaname=gravijul-v2 function=sinh/flip/log passes=1
  center-mag=1.33227e-015/-8.88178e-016/0.4266667
  params=0/0.9/0/0/9/0 float=y maxiter=2047 inside=0
  decomp=256
  colors=000JKQ<13>eej<15>JKQ00z<14>0zz<15>00z5Mf<21>\
  TeuUfvTev<22>5MfFLM<14>bhj<15>FLM03g<22>`bz<22>25h03\
  g0Wz<14>00W<15>0WzFLM<14>bhj<15>FLM
  cyclerange=0/255
  }

g-gj2-06           { ; (c) Gedeon Peteri, Apr 15, 1998
                     ;   0:00:28.83 on P166MMX at 1024x768
                     ; Sylvie Gallet's variation of
                     ; Mark Christenson's formula
  reset=1960 type=formula formulafile=gravijul.frm
  formulaname=gravijul-v2 function=cotan/atan/acosh passes=t
  center-mag=-1.77636e-015/0/0.2596203/1/27.5
  params=0/1/-0.35/0/1e-019/0 float=y maxiter=300 inside=0
  potential=256/256/0 decomp=256
  colors=PMH<2>RNJROJSPJTQKUQK<9>aYPbZQc_Rd`SeaT<15>\
  sobtpcsnb<16>MHBKF9JE8ID7GB5E94<23>KRVLSWLTXMUYMVZ\
  NW`<4>LUZLUYLTXLSW<4>JPRJOQINQIMPIMO<14>CBBBAABBA<2>\
  CCCCCCCDDDED<29>OYWPZXPYW<8>NNFMLDMKBMI9MH7LF5<12>\
  aQ6bR6cR6dS6fT6gU7<6>o_7q`7qa9<4>ujJvlLvlL<20>kaRka\
  Sj`Sj`Ti_ThZU<9>KGD<8>PLH
  cyclerange=0/255
  }

g-gj4-01           { ; (c) Gedeon Peteri, Apr 15, 1998
                     ;   0:02:01.33 on P166MMX at 1024x768
                     ; Variation of Mark Christenson's formula
  reset=1960 type=formula formulafile=gravijul.frm
  formulaname=gravijul4 function=sin/exp/recip/asin passes=1
  center-mag=0.631233/9.99201e-016/2.100134/1/90
  params=0.2875/0/0.12/0/1/3 float=y maxiter=300
  inside=0 decomp=256
  colors=A04855<3>855955B55<19>e7Cg8DhAE<10>zVF<10>\
  hAEg8Dd8C<10>000<16>_2a<3>N8mJApI9kG7e<16>000<4>\
  bbbjjjssswwwzzz<2>zzzqqq<2>iiigggfff<2>aaa```__\
  _ZZZZZZQQQNMMKKJIHH<2>DCBBAAA98887<6>h2rwqUd2ltnT_2\
  fpjSV2`lgQQ1VhcPL1Pe`OG1JaXMB0DYULF0IUQJJ0NQNIN0SNJ\
  HS1YJGFW1bFCE_1gB9Cc1l75Bh2r319321<14>321E54J65<2>\
  T87W98YA9<6>jDClEDlED<4>zVF<3>rLFJApnGEJAnlFEJ9ljED\
  J9jgDCJ8heCCJ8ebBBJ7c`AAJ6aY89J6_V68J5YR38J5VR38J4\
  TXQJJ3RbVNJ3Ph_QJ2NlcTJ1KpgW855<2>855
  }

g-gj4-02           { ; (c) Gedeon Peteri, Apr 15, 1998
                     ;   0:07:06.00 on P166MMX at 1024x768
                     ; Variation of a Mark Christenson formula
                     ; Color map by Ray Girvan
  reset=1960 type=formula formulafile=gravijul.frm
  formulaname=gravijul4 function=cosh/exp/recip/acosh
  passes=1 center-mag=1.05471e-015/-2.08643/5.256485
  params=0.314/0/0/0/1/3 float=y maxiter=300 inside=0 decomp=256
  colors=000iPAhO9gN8fM7<2>iQDjSFkUHlWJmXL<7>vj`xlcxkb\
  <13>rVEqTCpTC<9>dNAbN9aM9`M8_L8YK7<4>VI6UH6TG6SG6SF5RF5\
  <5>MB4<12>n`RqbTsdVvgXvfW<13>pTBoR9nR9<12>`H6_H5ZG5YG5XF5\
  <13>G63<15>tbQ<14>kPAjO8jO8<13>_H6ZG5_I7<5>jUKkWMmYO\
  n_QpbT<4>xlc<9>LGFHDCDA9976543000<15>zqk<14>t_LsYJsYJ<10>jPA
  }

g-gj4-03           { ; (c) Gedeon Peteri, Apr 15, 1998
                     ;   0:00:21.70 on P166MMX at 1024x768
                     ; Variation of a Mark Christenson formula
                     ; Color map by Paul Carlson
  reset=1960 type=formula formulafile=gravijul.frm
  formulaname=gravijul4 function=exp/exp/log/log passes=1
  center-mag=-6.66134e-016/4.44089e-016/0.9861933
  params=1.7/0/0/0/1/2 float=y maxiter=300 inside=0 decomp=256
  colors=zW0<94>d50d50d50d50d50d50<24>d50GGz<123>00O000<3>000
  }

frm:gravijul-v2 { ; Variation on Mark Christenson's gravijul by Sylvie
Gallet
   z = pixel :
   w = fn1(real(z)) , x = fn3(p1/fn2(w*w))
   w = fn1(imag(z)) , y = fn3(p1/fn2(w*w))
   z = x + flip(y) + p2
    |z| < p3
  }

frm:gravijul4 { ;variation of a Mark Christenson frm
  bailout = imag(p3), k = real(p3)
  z = abs(pixel):
  v = fn1(z)*k
  w = fn2(v*v)
  z = fn4(p1/fn3(w*w)) + p2
  |z| < bailout
}



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Date: Wed, 15 Apr 1998 23:09:26 -0400
From: "Blake Hyde" <[e-mail]>
Subject: Re: (fractint) Another Text Editor

At 02:25 PM 4/15/1998 -0700, you wrote:
>Seems to be a lot of interest, but I haven't seen "NotesPad" by BremerCorp
>mentioned.  This one does everything that those mentioned so far will
>do...plus a lot more; including file conversions between Unix, DOS and Mac
>text file formats.   The current version 8.0 readily replaces Windows
>"Notepad", it's freeware, and no-one should be without it!   It's available
>at most software download sites.

Actually, NotesPad is specifically available at www.newbie.net/NotesPad.html.
The one gripe I have with it is that it doesn't do syntax highlighting.  I
have a goodly number of editors reviewed at my (main) web site:
    www.connectu.net/bhyde
I also welcome any additions to the ratings and reviews.


~~~~Blake Hyde~~~~
[e-mail]
~~~~~~~~~~~~~~~~~~

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Date: Wed, 15 Apr 1998 23:17:29, -0500
From: [e-mail] (MR CHARLES F CROCKER)
Subject: Re: (fractint) New Colormaps

Lets be practical about how much error is acceptable and look at some
numbers. Here are two map files for comparison. In the continuous one every
VGA pure primary color and every gray value appears. In the discontinuous
one there is one entry along in the middle that is duplicated. This means
that there is a block of four where there is a change of one, no change,
and a change of two. If errors of this magnitude were significant this
block would stand out. I can't even see it. Can anybody pick it out without
looking at the numbers?

Discontinuos            {
  colors=zzz<22>ccccccaaa<37>000z00<22>c00c00a00<37>00000z<21>00d00b00b<38\
  >0000z0<21>0d00b00b0<38>000
  }

Continuous             {
colors=zzz<62>000z00<62>00000z<62>0000z0<62>000
}

I say an error of one in any color number is insignificant. Any printing
process available to most of us is going to introduce errors that are
greater than this.

Charles

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Date: Wed, 15 Apr 1998 23:22:31 -0600
From: "Tim Wegner" <[e-mail]>
Subject: Re: (fractint) New Colormaps

Michael wrote:

> If we keep the map format (which I think we should) there is no need for
> the lossless option as it doesn't compress much.  I think that just
> using Sylvie's fix would be fine in this case.

At the moment I am leaning toward giving users both your
lossless option and Sylvie's.

1. There are just a few lines of code involved to add a
recordcolors=exact option to the existing fractint.

2. Losslessly compressed palettes take up about 768 bytes, whereas
maps take up 3000 bytes, so there is still value.

However, I do agree with you that for nearly every purpose, a color
error of 4 is not signficant.

Tim




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Date: Wed, 15 Apr 1998 23:22:31 -0600
From: "Tim Wegner" <[e-mail]>
Subject: Re: (fractint) New Colormaps

Jiho asked:

> If Mr. Bell's suggestion is the consensus (which I think it will be), can
> there be a warning to tell the user if there has been a lossy compression
> when saving colors into a par?

There could be, but I'm not sure it would be worth the complication.
If someone has a critical need, they should use color maps or the
lossles option, if we provide it.

> Also, would uncompressed par colors compress into the same par?  Or would
> its trueness to the original degrade further?  I'd test this out myself,
> but I don't have Sylvie's new fix.  The implication, if this be true, is
> that if you post pars, it'll be difficult to keep from degrading away
> from the original.

Pieter Branderhorst (the original color compression author) was aware
of the danger of drift. There are some lines of code in miscovl.c
specifically mentioning that these lines of code were added to
prevent drift.

I believe that it is possible to make sure that repeatedly loading
and saving PARs does not cause the colors to drift, but proof of this
needs to be tested.

Tim


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Date: Wed, 15 Apr 1998 23:22:31 -0600
From: "Tim Wegner" <[e-mail]>
Subject: Re: (fractint) New Colormaps

Jiho asked:

> Can't we improve the test3 color par by compressing it a little?

First, the lossless option Michael Bell proposed still does some
compression for some color maps - it just doesn't compress lyapunov.

> Maybe the we can begin the first character after
> 'colors=' with something that hasn't been used before in a color par to
> signify to Fractint that it should use the exact uncompression procedure
> instead of the normal. How about the back-slash? or comma, or semicolin.
> Or you can end up with 'color=' spelled 'exactcolor=' or something just as
> revealing.

Second, we're not proposing changing decoding colors, only improving
encoding. At this point I don't think it would be a good idea to go
to a different scheme.

The current encoding can be much more accurate with no significant
loss of compression. It can also be 100% accurate with about 25%
compression compared to maps. Either approach works with the same
decompression code.

Tim

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Date: Wed, 15 Apr 1998 23:40:40 -0700
From: "Jay Hill" <[e-mail]>
Subject: Re: (fractint) Another Text Editor - NOT!

> From: Blake Hyde <[e-mail]>
>Seems to be a lot of interest, but I haven't seen "NotesPad" by BremerCorp
>mentioned.  This one does everything that those mentioned so far will do...
...
> I have a goodly number of editors reviewed at my (main) web site:
>     www.connectu.net/bhyde
> I also welcome any additions to the ratings and reviews.

You will scrap you review page and list only one editor after you try
PFE (Programmer's File Editor)  :-)

Within one hour of opening NotesPad, I found 8 features which I
use a lot which are missing from NotesPad.

1)  Only up to 16 files can be open at once in NotesPad . I just opened
100 C and C++ files in PFE.

2) Only 8 history of files opened in NotesPad . PFE allows 64. This is
great for keeping track of lots of par files opened recently.

3) NotesPad uses a tabbed view. PFE puts your files in MDI window
format, in cascade, tile vertical, tile horizontal, or iconize and you
can kill maximize, minimize using the little corner buttons. Yes, it
can tile 100 files on your screen!

4) PFE can run a DOS command and capture the output in a file in
the editor you can edit. You type in the DOS command while still in
PFE.   This is great when you are searching files for that par.
NotesPad just launches the DOS window.

5) NotesPad ignored end of lines in HTML files giving you either one
long line to edit or (with line wrap) an unformatted screen full.  PFE
showed an ASCII file with normal lines (as in the original file) ready to edit.

6) NotesPad chokes on non-ASCII files. PFE will open even binary
files (optionally as read only). PFE file size limited only by RAM.
I have edited 40 Meg files!

7) Drag and drop failed (sometimes!!) in NotesPad. I got a "file
not found - create new file" message! To launch the 100 C files,
I marked the lot in a directory and dragged them over to the PFE
icon on the desktop. On another test, the HTML not found message
popup was covered by the NotesPad splash screen (that comes up
when launched) so I could not respond. This appeared to lock up
my machine since I could not get rid of the splash screen which
insisted on staying on top. I could not find the NotesPad as a
running task when I pressed CtrlAtlDelete. It had not gotten
that far yet!  After some more fooling around I finally got the
file not found popup and canceled it. Very bad!

8) NotesPad hogs to desk top not allowing the Win95 tool bar
(the one we access other running programs from) to pop up!  I
like to run the tool bar in auto hide. Shame! I had to minimize or
restore NotesPad to get back to this emailer.

I will admit the spell checker might be nice (NotesPad has it, PFE
has none). But NotesPad spell checker is out of control. I mean,
it starts at the top and runs down the document. We need to be
able to check a marked portion or from the cursor. Spell checking
the color part of a par is no fun.

Not trying to start an editor war, but since I introduced PFE to
this list last year,  I have not seen a better editor.  I think I will
stick with PFE, thank you.

After two months of very tough software testing at work, I am in
a mean mood. I see, looking at the above, I had no mercy.  Sorry.
Yes I know it is free etc....  but so is PFE. So...

get PFE at
http://www.lancs.ac.uk/staff/cpaap/pfe/
or the USA mirror site...
http://pfe.iquill.net/

Now I shall get off my soap box and see what Dr. J is up to. :-)

Jay


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End of fractint-digest V1 #166
******************************