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Atari Forever 4
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TOOLS
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MGIF
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EXAMPLES
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README
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1998-03-14
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Here are some examples showing off the MGIF image manipulation functions.
Most of the files were prepared by Eero Tamminen (see manual).
These pictures should really be in an ST-Guide manual supplement, but
that's for a later release of MGIFv5.
Pictures/
Original images for the examples below.
Logo/
How to make you own MGIF logo:
- text explanation
- final GIF
- POV script for nice effects
- example output using the POV script
Functions/
Examples of the functions:
- Rotate (44 degrees)
- Histogram equalization
- Inversion (no offset)
- Log scaling
- Threshold (at 128)
- Contrast expansion (from 128)
- Brightening (by 16)
- Darkening (by 16)
- Blur (size 3) (Median didn't change the image noticebly)
- Lmax (size 3)
- Lmin (size 3)
- Oil (7, 64) (first Lmax 3 as otherwise it became too dark)
- Pixelize (size 5)
Convolut/
Examples of some convolution matrix applications:
- Dirs image contains examples of all the directions using Kirsch.
- Directional matrixes (NE direction):
- Shift difference
- Gradient direction
- Smoothing
- Kirsch
- Sobel
- Line
- Bias (64) with the Kirsch matrix.
- Symmetrical matrixes:
- Low pass 2
- High pass 2
- Laplace 2
Combine/
A pair of image combination examples.
- Intheart: Intel outside image (1/4) overlaid on a heart (3/4)
with an addition of laplace 2.
- Guardian: Combined images with Kirch added on different
accuracies for larger and smoother emboss effect.
(((scale 1/4, Kirch, scale 4, blur) ||
(scale 1/2, Kirch, scale 2)) ||
(Kirch))