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fractint-digest       Saturday, January 17 1998       Volume 01 : Number 077




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

Date: Fri, 16 Jan 1998 19:46:43 -0800
From: "Jay Hill" <[e-mail]>
Subject: Re: (fractint) A newbie's approach to designing formulas.

OK Gedeon,

I htought I'd see what makes it tick.  Changed parameters to complex
values.  Don't know what is was and now I don't know what it is....
but I sure messed it up!

Jay


gfpdvc01-03-mess   { ; change to complex
  reset=1960 type=formula formulafile=j_decomp.par
  formulaname=gfpdvc01 function=flip/asin/log passes=1
  center-mag=4/-3.55271e-015/0.125/1/-90 params=1/7/1/0/1.5/0 float=y
  maxiter=1023 potential=255/255/0
  colors=000Wbj<18>8CE776<21>ffa<23>776W00<14>z00<15>W00688<21>bffchhbff<2\
  2>68800z<6>0zz<7>00zDBE<21>daeebfdae<22>DBEWG0<6>zW0<7>WG08CE<21>ahpbira\
  hp<2>Yck
  }


- ----------
> From: Gedeon Peteri <[e-mail]>
> To: [e-mail]
> Subject: Re: (fractint) A newbie's approach to designing formulas.
> Date: Friday, January 16, 1998 7:17 PM
>
> Nature102 wrote:
>
> >  ...I've got a bunch of formulas in Chemistry I can work with when I get
the
> > spare time. ::Wonders what a fractalized specific heat formula would look
like::
> > :-P::
>
> I don't know, but what you write reminds me that when a few months ago I
began to
[...]
> not mathematical rigor. In any event, you will undoubtedly discover something
> other than a damped vibration curve in it.
>
>  Gedeon
>
> Formula:
>
frm:gfpdvc01 {;Inspired by equation of a damped vibration curve
   z=fn1(1/pixel):
   y=p1*exp(p2*z)*fn2(p3*z)
   z=fn3(z*z) - y
   |z|<=16
   }

> Par:
>
> gfpdvc01-03           { ;   0:00:25.32
>                      ; Nov 15, 1997
>   reset=1960 type=formula formulafile=*.frm
>   formulaname=gfpdvc01 function=flip/asin/log passes=1
>   center-mag=0/4.92293/0.1227727 params=7/0/1/0/1.5/0
>   float=y maxiter=1023 potential=255/255/0
>   colors=000Wbj<18>8CE776<21>ffa<23>776W00<14>z00<15>\
>   W00688<22>chh<23>68800z<6>0zz<7>00zDBE<21>daeebfdae\
>   <22>DBEWG0<6>zW0<7>WG08CE<21>ahpbirahp<2>Yck
>   }
>


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

Date: Fri, 16 Jan 1998 23:13:35 -0800
From: Peter Jakubowicz <[e-mail]>
Subject: (fractint) Triangle Inequality Coloring

Hi
If someone would be kind enough to explain what the triangle inequality
coloring method is I wld appreciate it.
Peter


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

Date: Fri, 16 Jan 1998 23:11:27 -0500
From: Gedeon Peteri <[e-mail]>
Subject: Re: (fractint) A newbie's approach to designing formulas.

Well, Jay, one thing is for sure: it still does not look like a damped vibration
curve, but I would not say you messed it up!
Gedeon

Jay Hill wrote:

> OK Gedeon,
>
> I htought I'd see what makes it tick.  Changed parameters to complex
> values.  Don't know what is was and now I don't know what it is....
> but I sure messed it up!
>
> Jay




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

Date: Sat, 17 Jan 1998 02:08:40
From: "Lavondyss" <[e-mail]>
Subject: (fractint) hello

Hey all,

I'd like to humbly invite everyone to visit my fractal page and the rest of
my domain. Feel free to give comments and advice. Please point your browsers
to:

http://www.tc.umn.edu/nlhome/m055/nguy0505/Fractals.htm

I'll be adding more fractals when I have time. Have fun!

- -Lavondyss





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

Date: Sat, 17 Jan 1998 11:49:35 +1
From: "J.P. Louvet" <[e-mail]>
Subject: Re: (fractint) hello

le 17 Jan 98 a 2:08, Lavondyss ecrivait (Lavondyss wrote) :

> I'd like to humbly invite everyone to visit my fractal page and the rest
> of my domain. Feel free to give comments and advice. Please point your
> browsers to:
>
> http://www.tc.umn.edu/nlhome/m055/nguy0505/Fractals.htm

Nice personal fractals, especially in the 2nd half of you page, but when
you show images made by others, you must give the name of their creators.
Nice background also, but 144 Kb !

Jean-Pierre louvet : [e-mail]
Fractal album :
http://graffiti.cribx1.u-bordeaux.fr/MAPBX/louvet/jpl0.html

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

Date: Sat, 17 Jan 1998 07:36:54 -0500 (EST)
From: [e-mail] (Paul Derbyshire)
Subject: Re: (fractint) Re: Tim's_Fract

>Damien...
>
>Your formula file is very well organized...and I used your pars as
>examples.  But I was looking of a way to do this within the formula....if
>it can't be done already it would be a useful feature.....a sort of combo
>par/formula. We users have simple needs....we want to make basic things work.

What is really needed is a way to specify formula defaults for everything
from the view area to the z params and things like "outside=real" if
necessary.

Built-in types have defaults,e.g. put in lambda, and there are nontrivial
values on the 'z' screen automagically, chosen to generate an interesting
image.


- --
    .*.  Friendship, companionship, love, and having fun are the reasons for
 -()  <  life. All else; sex, money, fame, etc.; are just to get/express these.
    `*'  Send any and all mail with attachments to the hotmail address please.
Paul Derbyshire [e-mail] [e-mail]

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

Date: Sat, 17 Jan 1998 08:56:02 -0500
From: Lee Skinner <[e-mail]>
Subject: (fractint) Lee's Truecolor PNG site

Hi all,

 Noel Giffin has updated my truecolor composite gallery at Spanky with
12 new images.  They are available at:

  http://spanky.triumf.ca/www/fractint/lee/lee.html

These are more images using the Carr2821 formula, and remind me of nature=

scenes.  Titles include "Clouds Over Shiprock", "Ganymede, Io and Europa"=
,
"Shadows on the Trail", and "Crane Marsh".  Thumbnails are jpeg, but the
1024x768 images are PNG files.

Enjoy!

Lee Skinner

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

Date: Sat, 17 Jan 1998 08:34:34 -0700 (MST)
From: Kerry Mitchell <[e-mail]>
Subject: Re: (fractint) Triangle Inequality Coloring

Peter,

The triangle inequality coloring method (at least, the one I developed),
colors the fractal based on a fundamental theorem of complex numbers.
Given 2 complex numbers a and b, then

|a + b| <= |a| + |b|, and
|a + b| >= ||a| - |b||,

where || represents the magnitude, not Fractint's magnitude-squared.
Basically, since complex numbers have both magnitude and direction, the
resulting magnitude of the sum of two numbers lies somewhere between the
difference of their magnitudes and the sum of their magnitudes.  For
example, if we use 3 and -5,

|3 + -5| = |-2| = 2 >= ||3| - |5|| = |3 - 5| = |-2| = 2

At one extreme, the 2 numbers are pointing different directions, so adding
them results in subtracting their magnitudes.  At the other extreme,

|2i + 4i| = |6i| = 6 <= |2i| + |4i| = 2 + 4 = 6

So if both numbers are pointing in the same direction, then adding them
results in adding their magnitudes.

This can be visualized by considering a triangle in the complex plane.
Start at the origin (0,0) and draw one leg out to a.  From there, draw
another leg to a+b.  Then, draw the third leg from (0,0) to a+b.  The two
extreme cases are cases where the triangle has zero area, since all 3
legs lie on one line.

Anyway, back to fractals.  The important thing is that, if we replace a
with z^2 and b with c, then

||z^2|-|c| <= |z^2+c| <= |z^2|+|c|, or

lowerbound <= |current iteration| <= upperbound.

This can be rescaled to:

0 <= (|current iteration| - lowerbound) / (upper-lower) <= 1.

Multiply by 2pi and you have an angle that shows up nicely using
Fractint's decomp option.

Here's a formula file using the triangle method.  I have also used
averaging to reduce banding.

Enjoy,
Kerry Mitchell

- -------------------------------------------------------------------------------
Kerry Mitchell
[e-mail]
- -------------------------------------------------------------------------------

avetriang_man {
        ; Average together 8 Mandelbrots with same c, different bailouts.
        ; Each iteration, see where |sqr(z)+c| lies between minimum
        ; and maximum bounds given by triangle inequality.
        ; Form scale = (|sqr(z)+c| - min)/(max - min).
        ; Colors by average scale, use "decomp=256" coloring.
        ; real(p1)=bailout >> 4, try 1e6
        ; imag(p1)=coloring "speed" > 0, try 10
        c=zc=pixel, rc=cabs(c), r2zc=|zc|
        iter=1, k=flip(imag(p1)), tot=0
        b1=real(p1), fac=b1^0.125, b2=b1*fac, b3=b2*fac
        b4=b3*fac, b5=b4*fac, b6=b5*fac, b7=b6*fac, b8=b7*fac
        iter1=iter2=iter3=iter4=iter5=iter6=iter7=iter8=0:
        iter=iter+1, z2=sqr(zc)+c, rz2=cabs(z2),
        fac=abs(r2zc-rc), q=(rz2-fac)/(r2zc+rc-fac), tot=tot+q
        zc=z2, r2zc=|zc|
        if (r2zc>b1)
          if (iter1==0)
            iter1=iter, q1=tot/iter
          endif
          if (r2zc>b2)
            if (iter2==0)
              iter2=iter, q2=tot/iter
            endif
            if (r2zc>b3)
              if (iter3==0)
                iter3=iter, q3=tot/iter
              endif
              if (r2zc>b4)
                if (iter4==0)
                  iter4=iter, q4=tot/iter
                endif
                if (r2zc>b5)
                  if (iter5==0)
                    iter5=iter, q5=tot/iter
                  endif
                  if (r2zc>b6)
                    if (iter6==0)
                      iter6=iter, q6=tot/iter
                    endif
                    if (r2zc>b7)
                      if (iter7==0)
                        iter7=iter, q7=tot/iter
                      endif
                      if (r2zc>b8)
                        if (iter8==0)
                          iter8=iter, q8=tot/iter
                        endif

        qave=(q1+q2+q3+q4+q5+q6+q7+q8)*0.125
        z=exp(qave*k)

                      endif
                    endif
                  endif
                endif
              endif
            endif
          endif
        endif

        r2zc <= b8
        }


On Fri, 16 Jan 1998, Peter Jakubowicz wrote:

> Hi
> If someone would be kind enough to explain what the triangle inequality
> coloring method is I wld appreciate it.
> Peter
>
>
> -
> ------------------------------------------------------------
> Thanks for using Fractint, The Fractals and Fractint Discussion List
> Post Message:   [e-mail]
> Get Commands:   [e-mail] "help"
> Administrator:  [e-mail]
> Unsubscribe:    [e-mail] "unsubscribe fractint"
>


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

Date: Sat, 17 Jan 1998 08:34:34 -0700 (MST)
From: Kerry Mitchell <[e-mail]>
Subject: Re: (fractint) Triangle Inequality Coloring

Peter,

The triangle inequality coloring method (at least, the one I developed),
colors the fractal based on a fundamental theorem of complex numbers.
Given 2 complex numbers a and b, then

|a + b| <= |a| + |b|, and
|a + b| >= ||a| - |b||,

where || represents the magnitude, not Fractint's magnitude-squared.
Basically, since complex numbers have both magnitude and direction, the
resulting magnitude of the sum of two numbers lies somewhere between the
difference of their magnitudes and the sum of their magnitudes.  For
example, if we use 3 and -5,

|3 + -5| = |-2| = 2 >= ||3| - |5|| = |3 - 5| = |-2| = 2

At one extreme, the 2 numbers are pointing different directions, so adding
them results in subtracting their magnitudes.  At the other extreme,

|2i + 4i| = |6i| = 6 <= |2i| + |4i| = 2 + 4 = 6

So if both numbers are pointing in the same direction, then adding them
results in adding their magnitudes.

This can be visualized by considering a triangle in the complex plane.
Start at the origin (0,0) and draw one leg out to a.  From there, draw
another leg to a+b.  Then, draw the third leg from (0,0) to a+b.  The two
extreme cases are cases where the triangle has zero area, since all 3
legs lie on one line.

Anyway, back to fractals.  The important thing is that, if we replace a
with z^2 and b with c, then

||z^2|-|c| <= |z^2+c| <= |z^2|+|c|, or

lowerbound <= |current iteration| <= upperbound.

This can be rescaled to:

0 <= (|current iteration| - lowerbound) / (upper-lower) <= 1.

Multiply by 2pi and you have an angle that shows up nicely using
Fractint's decomp option.

Here's a formula file using the triangle method.  I have also used
averaging to reduce banding.

Enjoy,
Kerry Mitchell

- -------------------------------------------------------------------------------
Kerry Mitchell
[e-mail]
- -------------------------------------------------------------------------------

avetriang_man {
        ; Average together 8 Mandelbrots with same c, different bailouts.
        ; Each iteration, see where |sqr(z)+c| lies between minimum
        ; and maximum bounds given by triangle inequality.
        ; Form scale = (|sqr(z)+c| - min)/(max - min).
        ; Colors by average scale, use "decomp=256" coloring.
        ; real(p1)=bailout >> 4, try 1e6
        ; imag(p1)=coloring "speed" > 0, try 10
        c=zc=pixel, rc=cabs(c), r2zc=|zc|
        iter=1, k=flip(imag(p1)), tot=0
        b1=real(p1), fac=b1^0.125, b2=b1*fac, b3=b2*fac
        b4=b3*fac, b5=b4*fac, b6=b5*fac, b7=b6*fac, b8=b7*fac
        iter1=iter2=iter3=iter4=iter5=iter6=iter7=iter8=0:
        iter=iter+1, z2=sqr(zc)+c, rz2=cabs(z2),
        fac=abs(r2zc-rc), q=(rz2-fac)/(r2zc+rc-fac), tot=tot+q
        zc=z2, r2zc=|zc|
        if (r2zc>b1)
          if (iter1==0)
            iter1=iter, q1=tot/iter
          endif
          if (r2zc>b2)
            if (iter2==0)
              iter2=iter, q2=tot/iter
            endif
            if (r2zc>b3)
              if (iter3==0)
                iter3=iter, q3=tot/iter
              endif
              if (r2zc>b4)
                if (iter4==0)
                  iter4=iter, q4=tot/iter
                endif
                if (r2zc>b5)
                  if (iter5==0)
                    iter5=iter, q5=tot/iter
                  endif
                  if (r2zc>b6)
                    if (iter6==0)
                      iter6=iter, q6=tot/iter
                    endif
                    if (r2zc>b7)
                      if (iter7==0)
                        iter7=iter, q7=tot/iter
                      endif
                      if (r2zc>b8)
                        if (iter8==0)
                          iter8=iter, q8=tot/iter
                        endif

        qave=(q1+q2+q3+q4+q5+q6+q7+q8)*0.125
        z=exp(qave*k)

                      endif
                    endif
                  endif
                endif
              endif
            endif
          endif
        endif

        r2zc <= b8
        }


On Fri, 16 Jan 1998, Peter Jakubowicz wrote:

> Hi
> If someone would be kind enough to explain what the triangle inequality
> coloring method is I wld appreciate it.
> Peter
>
>
> -
> ------------------------------------------------------------
> Thanks for using Fractint, The Fractals and Fractint Discussion List
> Post Message:   [e-mail]
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> Administrator:  [e-mail]
> Unsubscribe:    [e-mail] "unsubscribe fractint"
>


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

Date: Sat, 17 Jan 1998 10:04:21 -0700
From: Roland Silver <[e-mail]>
Subject: (fractint) GIFs to PARs

Anyone know of a way to convert GIFs to PARs?


- -- Rollo Silver <[e-mail]>




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

Date: Sat, 17 Jan 1998 09:30:20 -0800
From: Wizzle <[e-mail]>
Subject: Re: (fractint) pallete editing bug?

I have a diamond stealth card....about 2 years old....I have no problems in
any sort of vga or super vga.

At 10:01 PM 1/16/80 -0500, you wrote:
>:What video card do you have?  Maybe it doesn't like VGA mode much.
>
>I have an IBM I4R9, I think. It's a weird one.
>
>
>-
>------------------------------------------------------------
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>
>

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

Date: Sat, 17 Jan 1998 10:59:01 -0600
From: "Damien M. Jones" <[e-mail]>
Subject: Re: (fractint) Re: Tim's_Fract

Paul,

 - Built-in types have defaults,e.g. put in lambda, and there are nontrivial
 - values on the 'z' screen automagically, chosen to generate an interesting
 - image.

Most of the formulae I have made will provide default values for entries on
the z page that are left at zero; this is part of the formula, not the PAR
file that sets defaults.  However, because these values are assigned when
calculation actually begins, they are not reflected on the z page, so
unless you look at the formula code, you won't see what's going on.
Providing the defaults is mostly there for folks who plug numbers in at
random; this lets them at least see something before fiddling with numbers.
;-)

Damien M. Jones   \\
[e-mail]  \\  http://www.icd.com/tsd/  (temporary sanity designs)
                    \\  http://www.fractalus.com/ (fractals are my hobby)


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

Date: Sat, 17 Jan 1998 09:59:44 -0800
From: Wizzle <[e-mail]>
Subject: Re: (fractint) hello

Lavondyss

Nice page!!! oodles of stuff.  I checked out a couple of your fractals and
they are lovely.....I've added your page to a list of fractal links I'm
trying to work up, if you don't mind....

Keep fractaling!!

Angela

At 02:08 AM 1/17/98, you wrote:
>
>Hey all,
>
>I'd like to humbly invite everyone to visit my fractal page and the rest of
>my domain. Feel free to give comments and advice. Please point your browsers
>to:
>
>http://www.tc.umn.edu/nlhome/m055/nguy0505/Fractals.htm
>
>I'll be adding more fractals when I have time. Have fun!
>
>-Lavondyss
>
>
>
>
>
>-
>------------------------------------------------------------
>Thanks for using Fractint, The Fractals and Fractint Discussion List
>Post Message:   [e-mail]
>Get Commands:   [e-mail] "help"
>Administrator:  [e-mail]
>Unsubscribe:    [e-mail] "unsubscribe fractint"
>
>

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

Date: Sat, 17 Jan 1998 10:05:07 -0800
From: Wizzle <[e-mail]>
Subject: Re: (fractint) Re: Tim's_Fract

Damien....

You got my idea exactly!!!  Can such a feature be added to fractint??
Sometimes I have a hard time conveying what I mean because I'm not really
familiar with the technical aspects of fractint.

Another question.....I noticed in some of the pars that Jay Hill posts that
it reads

frm:formulaname {formula here}

If I paste this whole thing into my formula file (currently jan98.frm),
fractint doesn't pick up the formula.  But I suspect there is a good reason
why Jay uses this methodology.....?????? am I right??? and what does it do???

Angela

At 07:36 AM 1/17/98 -0500, you wrote:
>>Damien...
>>
>>Your formula file is very well organized...and I used your pars as
>>examples.  But I was looking of a way to do this within the formula....if
>>it can't be done already it would be a useful feature.....a sort of combo
>>par/formula. We users have simple needs....we want to make basic things
work.
>
>What is really needed is a way to specify formula defaults for everything
>from the view area to the z params and things like "outside=real" if
>necessary.
>
>Built-in types have defaults,e.g. put in lambda, and there are nontrivial
>values on the 'z' screen automagically, chosen to generate an interesting
>image.
>
>
>--
>    .*.  Friendship, companionship, love, and having fun are the reasons for
> -()  <  life. All else; sex, money, fame, etc.; are just to get/express
these.
>    `*'  Send any and all mail with attachments to the hotmail address
please.
>Paul Derbyshire [e-mail] [e-mail]
>
>-
>------------------------------------------------------------
>Thanks for using Fractint, The Fractals and Fractint Discussion List
>Post Message:   [e-mail]
>Get Commands:   [e-mail] "help"
>Administrator:  [e-mail]
>Unsubscribe:    [e-mail] "unsubscribe fractint"
>
>

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

Date: Sat, 17 Jan 1998 10:10:59 -0800
From: Wizzle <[e-mail]>
Subject: Re: (fractint) Lee's Truecolor PNG site

Lee...

Why did you select PNG as the format rather than say, tiff or bmp??

Angela

At 08:56 AM 1/17/98 -0500, you wrote:
>Hi all,
>
> Noel Giffin has updated my truecolor composite gallery at Spanky with
>12 new images.  They are available at:
>
>  http://spanky.triumf.ca/www/fractint/lee/lee.html
>
>These are more images using the Carr2821 formula, and remind me of nature
>scenes.  Titles include "Clouds Over Shiprock", "Ganymede, Io and Europa",
>"Shadows on the Trail", and "Crane Marsh".  Thumbnails are jpeg, but the
>1024x768 images are PNG files.
>
>Enjoy!
>
>Lee Skinner
>
>-
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Date: Sat, 17 Jan 1998 12:42:25 -0600
From: "Damien M. Jones" <[e-mail]>
Subject: Re: (fractint) Re: Tim's_Fract

Angela,

 - You got my idea exactly!!!  Can such a feature be added to fractint??

Theoretically, anything can be added to FractInt. :)  The question is, will
somebody do it?  There are things I want to do with the FractInt code, but
currently I am so overwhelmed with other things that I haven't had a
chance.  I haven't even had time to update my own web gallery... :(

 - Another question.....I noticed in some of the pars that Jay Hill posts that
 - it reads
 -
 - frm:formulaname {formula here}
 -
 - If I paste this whole thing into my formula file (currently jan98.frm),
 - fractint doesn't pick up the formula.

Just take out the frm: before the formula name.  frm: is a prefix you put
on the formula name so that you can put a FRM inside a PAR.  When you take
the FRM out of the PAR and put it back into a FRM file, you need to take
off the frm: prefix.  Does this make sense?

 - But I suspect there is a good reason why Jay uses this methodology.....???

Yep, so you can cut & paste the PAR and have everything in one file.  With
the frm: prefix, you can put the PAR and the FRM in the same file, and it's
easier to pass around your work.  Before the prefix was available, you had
to pass around a PAR *and* a FRM, and this was a little more cumbersome--it
was too easy for a PAR to get separated from its FRM, and if you don't have
the FRM, the PAR is no good.

Damien M. Jones   \\
[e-mail]  \\  http://www.icd.com/tsd/  (temporary sanity designs)
                    \\  http://www.fractalus.com/ (fractals are my hobby)


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Date: Sat, 17 Jan 1998 14:20:10 -0500 (EST)
From: [e-mail] (Michael Traynor)
Subject: Re: (fractint) GIFs to PARs

>
>Anyone know of a way to convert GIFs to PARs?
>
>
>-- Rollo Silver <[e-mail]>
>

Courtesy of Tim Wegner:

***************************************

Make a file called makepar.bat (or whatever) containing:

for %%f in (*.gif) do fractint %%f makepar=%1 batch=yes

Then type in:

makepar mypars

This will put PARS for all the GIFs in the current directory in the
file mypars.par.

***************************************

[I should add that fractint either has to be in your PATH or in the
directory that the gifs are in.]

It works fine.  I used it to extract the pars from the over 1,000 gifs on
Jill Lawson's web page, though the saving in space was not huge, due to
the small size of the images she has posted.

- --
Mike Traynor

People who like this sort of thing will find this the sort of thing they like.
    Abraham Lincoln

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

Date: Sat, 17 Jan 1998 14:24:59 -0500 (EST)
From: [e-mail] (Michael Traynor)
Subject: Re: (fractint) Re: Tim's_Fract

Angela asks:
>
>Another question.....I noticed in some of the pars that Jay Hill posts that
>it reads
>
>frm:formulaname {formula here}
>
>If I paste this whole thing into my formula file (currently jan98.frm),
>fractint doesn't pick up the formula.  But I suspect there is a good reason
>why Jay uses this methodology.....?????? am I right??? and what does it do???

When fractint loads a par from a par file it will read the formula if the line
starts with "frm:".  It ignores such a thing in an frm file.  If you want the
formula in your jan98.frm file, just cut and paste and delete the "frm:"


- --
Mike Traynor

People who like this sort of thing will find this the sort of thing they like.
    Abraham Lincoln

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Date: Sat, 17 Jan 1998 11:34:50 -0800 (PST)
From: Jon Noring <[e-mail]>
Subject: Re: (fractint) Lee's Truecolor PNG site

Wizzle <[e-mail]> wrote:

>Why did [Lee Skinner] select PNG as the format rather than say, tiff or bmp??

For a lossless format, PNG is outstanding (much better than Tiff and BMP, and
for 256 colors, GIF), and is *the* format of the near future since it is also
Public Domain (unlike GIF).  For Windows 3.1/95 most graphics programs support
PNG, e.g., PhotoShop, PaintShopPro, Graphics Workshop, etc.

And note that in the next major revision of Fractint, GIF will be drop-kicked
to be replaced by ...... PNG!

If it's good enough for Tim, it's good enough for me.  :^)

So it behooves everybody to get on the PNG bandwagon as soon as possible and
to get the necessary graphics software to handle PNG images.  I archive all of
my ultra-hi-rez images as PNG.

Jon Noring

_____________________________________________________________________________
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Date: Sat, 17 Jan 1998 11:58:55 -0800
From: "Jay Hill" <[e-mail]>
Subject: Re: (fractint) GIFs to PARs

Hi Fractintiers,

We could change the batch file slightly. If you want to do certain
GIFs and as I, don't want to much in your path so Fractint is not there,
try this.  Make a subdir off your fractint dir. Move or copy your GIFs
to it. In DOS run this bat...

 for %%f in (*.gif) do ..\fractint %%f makepar=%1 batch=yes

Alas, this does not work for me, neither does the original! I get
an error message. Even when running in the fractint dir.

C:\JAY\FRACTINT.196>makepar mypars

C:\JAY\FRACTINT.196>for f makepar=mypars batch=yes
Syntax error

So what is wrong?
Jay

- ----------
> From: Michael Traynor <[e-mail]>
[...]
> Courtesy of Tim Wegner:
>
> ***************************************
>
> Make a file called makepar.bat (or whatever) containing:
>
> for %%f in (*.gif) do fractint %%f makepar=%1 batch=yes
>
> Then type in:
>
> makepar mypars
>
> This will put PARS for all the GIFs in the current directory in the
> file mypars.par.
>
> ***************************************
>
> [I should add that fractint either has to be in your PATH or in the
> directory that the gifs are in.]
>
> It works fine.  I used it to extract the pars from the over 1,000 gifs on


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

Date: Sat, 17 Jan 1998 15:44:55 -0500
From: Lee Skinner <[e-mail]>
Subject: (fractint) Lee's Truecol

Hi Angela (the Fractal Wiz),

>>Why did you select PNG as the format rather than say, tiff or bmp??<<

Because Fractint is headed that way!  When Fractint goes truecolor, all
such images will automatically be saved as PNG.  It (with 256 colors)
compresses much tighter than GIF, it is lossless, and it is freeware
(unlike GIF). The next version of Fractint will be able to read these PNG=

files, but not bmp or tiff.  Until then, I use QPV (a shareware graphics
viewer) to view PNG images in DOS, and Graphics Workshop to view them in
Windows.

Lee

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Date: Sat, 17 Jan 1998 16:44:30 -0800
From: Peter Jakubowicz <[e-mail]>
Subject: Re: (fractint) Triangle Inequality Coloring

At 08:34 AM 1/17/98 -0700, Kerry Mitchell wrote:
>Kerry,

[good explanation snipped]

>Here's a formula file using the triangle method.  I have also used
>averaging to reduce banding.
>
>Enjoy,
>Kerry Mitchell

Thanks. That's way better than a lava lamp. Two gratuitous pars follow. I
someone cld look at them and tell me what I'm doing wrong, I'd appreciate it.

test               {
  reset=1960 type=formula formulafile=mitchell.frm
  formulaname=avetriang_man passes=t
  center-mag=-1.57516168132942300/-0.01326571056062576/101.7004
  params=10000000/50 float=y maxiter=100000 decomp=256
  colors=000510<27>z10340<28>z40370<28>z703A0<28>zA03E0<28>zE03H0<28>zH03K\
  0<28>zK03O0<28>zO03R0<14>YR0
  }

test1              {
  reset=1960 type=formula formulafile=mitchell.frm
  formulaname=avetriang_man passes=t
  center-mag=-1.57716568863030300/-0.01134960936219030/1871.144
  params=10000000/50 float=y maxiter=100000 decomp=256
  colors=000WXz<60>t3Ou2Nu3N<45>yr4ys3xs3<44>Xz0Wz0Wz0Wz0<60>IJ0II0II0II0<\
  30>PIR
  }



avetriang_man {
        ; Average together 8 Mandelbrots with same c, different bailouts.
        ; Each iteration, see where |sqr(z)+c| lies between minimum
        ; and maximum bounds given by triangle inequality.
        ; Form scale = (|sqr(z)+c| - min)/(max - min).
        ; Colors by average scale, use "decomp=256" coloring.
        ; real(p1)=bailout >> 4, try 1e6
        ; imag(p1)=coloring "speed" > 0, try 10
        c=zc=pixel, rc=cabs(c), r2zc=|zc|
        iter=1, k=flip(imag(p1)), tot=0
        b1=real(p1), fac=b1^0.125, b2=b1*fac, b3=b2*fac
        b4=b3*fac, b5=b4*fac, b6=b5*fac, b7=b6*fac, b8=b7*fac
        iter1=iter2=iter3=iter4=iter5=iter6=iter7=iter8=0:
        iter=iter+1, z2=sqr(zc)+c, rz2=cabs(z2),
        fac=abs(r2zc-rc), q=(rz2-fac)/(r2zc+rc-fac), tot=tot+q
        zc=z2, r2zc=|zc|
        if (r2zc>b1)
          if (iter1==0)
            iter1=iter, q1=tot/iter
          endif
          if (r2zc>b2)
            if (iter2==0)
              iter2=iter, q2=tot/iter
            endif
            if (r2zc>b3)
              if (iter3==0)
                iter3=iter, q3=tot/iter
              endif
              if (r2zc>b4)
                if (iter4==0)
                  iter4=iter, q4=tot/iter
                endif
                if (r2zc>b5)
                  if (iter5==0)
                    iter5=iter, q5=tot/iter
                  endif
                  if (r2zc>b6)
                    if (iter6==0)
                      iter6=iter, q6=tot/iter
                    endif
                    if (r2zc>b7)
                      if (iter7==0)
                        iter7=iter, q7=tot/iter
                      endif
                      if (r2zc>b8)
                        if (iter8==0)
                          iter8=iter, q8=tot/iter
                        endif

        qave=(q1+q2+q3+q4+q5+q6+q7+q8)*0.125
        z=exp(qave*k)

                      endif
                    endif
                  endif
                endif
              endif
            endif
          endif
        endif

        r2zc <= b8
        }




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

Date: Sat, 17 Jan 1998 17:00:53 -0500
From: Sylvie Gallet <[e-mail]>
Subject: Re: (fractint) Triangle Inequality Coloring

Hi Peter,

>> Hi
>> If someone would be kind enough to explain what the triangle inequalit=
y
>> coloring method is I wld appreciate it.
>> Peter

  I have implemented Kerry's algorithm in my triangle formulas.  You can
download the file triangle.zip on my homepage.

        - Sylvie

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