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The Devil's Doorknob BBS Capture (1996-2003)
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devilsdoorknobbbscapture1996-2003.iso
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UTILITIE
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DCT1_2.ZIP
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REL1.TXT
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1991-05-06
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1KB
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28 lines
Hi - I've just uploaded a vastly improved DCT txcoder: V1.2. Major points:
* Encoder now takes .GIF file as input by default
* Grey-scale only still; converts colour automatically
* Includes own very efficient coding algorithms - very small DCT file size
* Still has block discontiguities - no filtering yet
* Running about half final decode speed
EDCT.EXE encodes a .GIF image into DCT format - type EDCT on its own for
details of switches, etc. DDCT decodes and displays a .DCT image on a VGA.
Latest compression info:
file GIF DCT ratio comp bt/px type
alex-10.gif 180K 23K 8.3:1 12.7% 0.77 g/s
tracylrd.gif 93K 12K 7.8:1 12.8% 0.50 g/s
aq-f-022.gif 307K 69K 4.4:1 22.5% 1.80 col
sheshe3a.gif 157K 27K 5.8:1 17.0% 0.70 g/s
aussie.gif 42K 10K 4.2:1 23.6% 1.25 col
rimmer.gif 137K 19K 7.1:1 14.0% 0.50 col
muff03.gif 41K 12K 3.5:1 28.3% 1.48 g/s
ht-s0005.gif 272K 20K 13.7:1 7.3% 0.50 col
I expect colour support to approximately double the DCT file size; so it's
true that DCT gives a better deal for mono images. However, colour DCTs
should still be at least half the size of the GIF. DCT really wins when
there are large areas of continuous-tone, like a big bum (!).