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help.txt
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1993-05-22
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401 lines
Cross referenced help
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1,0:1
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.1
G.I.P. Help System
@2[General]
@7[Point Processes]
@14[Area Processes]
@32[Combining Images]
@27[Windows]
@28[Icons]
@23[Menus]
@13[Image Display]
@3[Atari Series]
@4[Image Formats]
@5[SHAREWARE]
.2
General Help
G.I.P. is a greyscale image
processor which can be used to
enhance images ( for DTP use for
example ) and process images
with filters.
The program runs on the @3[Atari]
range of computers and supports
a wide range of @4[image formats]
.3
Atari Computers Supported
G.I.P will execute on the Atari
ST, STE, TT and Falcon.
On the Falcon, Multitos is fully
supported.
All graphics resolutions are
supported. Including TRUECOLOUR on
the Falcon.
.4
Image Formats
The following image formats can be
processed with G.I.P.
@29[TIFF]version 5.0 (.TIF)
Compuserve GIF (.GIF)
Degas (.PI?)
Degas Elite (.PC?)
PC Paintbrush (.PCX)
Aim Greyscale (.IM)
Aim Colour (.COL)
Monochrome GEM (.IMG)
Hyperpaint GEM (.IMG)
.5
Program Information
G.I.P is SHAREWARE.If you use this
program, please send £15 to
Stephen Found
14 Bybrook Court,
Kennington,
Ashford,
Kent.
ENGLAND
TN24 9JX
Please support SHAREWARE.
.6
Area Selection
An area of an image is easily
defined with the mouse. Simply
place the mouse in a window and
drag the mouse with the left
button held down.
Once defined, all processes will
only affect the selected area.
To delete an area,double click the
mouse in the window.
.7
Point processes
Point processes affect all pixels
in an @6[image area] in a uniform
way.
G.I.P. provides the following
processes.
@8[Brightness] @11[Contrast]
@9[Threshold] @12[Negation]
@10[Histogram]
.8
Image Brightness
This option allows you to add a
constant value to every pixel in
the image. If the value is
negative, the image will become
darker.
.9
Thresholding
This option converts a grey image
to monochrome. A value from 0-255
is entered which is the threshold
value.
A pixel will become white if it's
grey value exceeds the threshold
and black if not.
.10
Histogram
A histogram of the image showing
the number of occurences of each
grey level is displayed.
.11
Contrast
Contrasting is a point process
which improves the usage of the
greyscale range within @6[images]
A threshold is entered, then the
process scans the image from the
darkest and lightest pixels to
find the range that exceeds the
threshold in both directions.
All pixels within the resulting
range are re-mapped to 0-255.
.12
Negation
Negation produces a 'negative' of
@6[the image]. A threshold value is
requested, then the image is
negated.All pixel values above the
threshold are subtracted from
255. Thus pixels that were dark
become light and vice versa.
If the entered threshold is 0, the
resulting image will be an exact
negative of the original image.
.13
Image Display
Every image loaded into GIP is
stored as a 256 level greyscale
image.
How the image is displayed depends
on your current display mode.
2 Colour 64 level dither
4 Colour 64 level dither
16 Colour 16 level grey
256 Colour 64 level grey
True Colour 64 level grey
.14
Area Processes
Area processes are also known as
@15[Filters]. Filters are used to
'bring out' various aspects of
images. When selected, you will be
presented with a scrolling list of
available filters. When a filter
is selected, it will be applied to
the current @6[Image area].
.15
Filters
The filters supported by GIP are
grouped into the following
categories:
@16[High spacial] @18[Contrast]
@17[Enhancement] @19[Detail]
@20[Gradient] @21[Noise removal]
@22[Edge detection]
.16
High Spacial Filters
4 types of high spacial filter are
provided. These filters accentuate
the high frequency content of an
image. Areas of low frequency are
left intact.
This has the effect of sharpening
areas of an image where the grey
values fluctuate and leaving areas
of uniform greyness as they were.
.17
Edge Ehancement Filters
5 types of edge enhancement filter
are provided.
Edge enhancement is usually used
as a preliminary step to feature
@19[extraction], and is typically
followed by @9[thresholding].
If overlay is selected, these
filters can also sharpen images.
.18
Contrast Filters
4 types of 'Roberts' contrast
filters are provided.These filters
accentuate both the high and low
frequencies of an image.
.19
Detail Extraction Filters
4 types of 'Laplace' extraction
filters are provided.These filters
differ from other edge filters in
that they are omni-directional, so
all edges are highlighted in every
direction.
Regions of constant or linear
intensity become black and regions
of rapidly changing intensity are
highlighted.
.20
Gradient Filters
8 Types of gradient filter are
provided, one for each compass
direction.
Other @17[edge enhancement] filters
process edges in 4 directions. The
gradient filters are conceptually
the same but operate in 8
directions.
.21
Noise removal - Median Filter
Median filtering uses the values
of surrounding pixels to change
the value of a central pixel. The
values of all the pixels are
sorted and the the middle (median)
value is selected. The result is
that any abrupt change (noise) is
eliminated.
.22
Edge Detection - Sobel Filter
The sobel filter is the only non-
linear filter provided.
A threshold value is requested
which determines the range of grey
values to be processed for edges.
An overlay option is also provided
which enables detected edges to be
overlayed on the original image.
.23
G.I.P Menus
There are 4 menu bars in GIP. Many
menu selections have keyboard
shortcuts which are shown next to
the menu title.
The GIP menu allows access to the
credits and GEM accessories.
The other menus are @24[File],
@25[Options] and @26[Print].
.24
File menu
Load - Load an image into memory
A wide range of @4[formats]
are supported.
Save - Save an image in IMG or
@30[TIFF]v5.0 format.
Info - Shows the size of the
current image.
Help - Where you are now.
Quit - Exit to the GEM desktop.
.25
Options Menu
Scale - Select display scale of
the current image
@10[Histogram] displays a Histogram
of the current image.
@8[Bright], @12[Negate], @9[Threshold]and
@11[Contrast] select @7[Point processes]
@15[Filter], @21[Noise] and @22[Edge Detect]
select @14[Area processes].
.26
Print Menu
This menu allows the printing of
images in Laserjet, Deskjet or
Postscript formats.
The Postscript format will output
in encapsulated postscript.
You may output to either the
Parallel port, Serial port or to
disk.
.27
Windows
Each image will be displayed in a
GEM window when loaded. The top
window is the 'active' window and
any processing selected will be
performed on the image in that
window.
You may select an @6[image area] to
process with the mouse.
The image in the active window can
be scrolled with the mouse or the
keyboard ( Cursor keys ).
.28
Icons
If the screen resolution is higher
than 320 pixels wide, an icon bar
is displayed.
There are icons for file handling,
@7[Point processes] and @14[Filters].
All icons have equivalent menu
entries and keyboard shortcuts.
See: @23[Menus]
.29
TIFF Support
G.I.P. Supports TIFF Version 5.0
of the following classes :-
TIFF Class B - Bilevel images
including 'Packbits' compression.
TIFF Class G - Greyscale
including 'LZW' compression.
TIFF Class P - Palette Colour
including 'LZW' compression.
.30
TIFF Output
G.I.P. Outputs TIFF 5.0 Class G
images. You may select either TIFF
uncompressed or LZW compression.
The output is in Motorola format
so some PC contemptible programs
may have trouble loading them,
although I have tested some images
with 'Coral Photopaint' which is
one of the few Intel programs that
recognise the existance of another
processor. ( Inverted snobbery ! )
@31[MORE]
.31
TIFF Output
I have tried generated TIFF images
on the Apple Macintosh (MacPaint),
Atari (TruePaint) and the Amiga
(Package unknown) and they loaded
without problems.
.32
Combining Images
Images and @6[image areas] can be
combined in a variety of ways.
Hold down either SHIFT key and
press the mouse button.The current
image area will be shown as a box.
Move the box, with the mouse still
pressed, into the destination
image, then let go of the button.
@33[MORE]
.33
Combining Images
A dialogue will be shown allowing
you to select the combination type
The following types are available:
( S=Source Image, D=Dest image )
AND D=S AND D OR D=S OR D
XOR D=S XOR D ADD D=D + S
SUB D=D - S MULT D=D * S
DIV D=D / S MIN D=MIN(D,S)
MAX D=MAX(D,S) AVG D=(D+S)/2
OVER D=S
.End