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VImgDec_125.ReadMe
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2000-05-21
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V³ Image Decoders with F-S Dithering for GIF
--------------------------------------------
Update 12.5
-----------
This image decoder updates fix a problem with
PNG tRNS (transparency) and alpha channel images.
They also provide numerous low-level optimizations
in the assember subroutines used for chunky2planar
and rgb-tripplet expansion.
Update 12.1
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This is a beta snapshot of the V³ Image Decoders
with support for Floyd-Steinberg Dithering for
rendering GIF images on CLUT (8 bit and less)
screens.
To activate the dithering, you need to set the
dithering options in the V³ "Images" pref section
to "Floyd-Steinberg".
The dithering implementation uses the real on-screen
RGB palette values to calculate the error values,
similiar to how V³ handles JPEG already, so it does not
rely on ObtainBestPen() and it's inherent relationship
to the phase of the moon or nearby lylines.
Individual dithering settings for the various image
types and support for dithering of PNG images will
follow.
Olli