Short: Palette for 24-bit to 8-bit mass image-conv Author: Björn Östberg Uploader: Björn Östberg Type: gfx/conv Version: 1.21 99-05-27 Requires: AGA chipset Architecture: generic 24to8pal v1.21 ©1999 SpEEd Productions / Björn Östberg Commecial use without the permission of the author is strictly forbidden! --------------------------------------------------------------------------- Disclaimer: The programmer can't be held responsible for ANY damages caused by this software - use it at your own risc! No fee whatsoever can be charged for the archive nor it's contense -not even for distrubution expences (Aminet have exclusive right to distribute this archive and charge whatever fee they seem suitable). This archive must be distributed in it's original shape without any modifications. --------------------------------------------------------------------------- 24to8pal is a universal 8-bit palette for remapping 24-bit images. The palette has been thoroughly optimized and tested with a wide variety of demanding 24-bit images. The first eight colours are standard MagicWB colors. The last four is available for custom usage. Background: Since the AmigaOS color-reduction routines sucked so much I created a preset 8-bit palette for remapping 24-bit images. The first versions wasn't that great, but in any case they'd beat the system remapping by far. Since then I have created somewhere around ten totally new versions of such palettes -each and everyone better than the previus. The palette is optimized to give a - for the eyes - concistant resolution in Velocity, Saturation and Hue according to a datareduction model. Colors that the eyes have difficulties separating - f.ex. colors in transitions between green and yellow, white & yellow or black & blue - have been supressed in favour of - for the eyes - more demanding transitions, f.ex. greyscales, black & yellow or white & blue. In the same way the saturation range have been supressed in favour of velocity. Many palettes came and went in order for me to balance the palette properly. The result is stunning concidering the use of a preset palette. After remapping a 24-bit highresolution image to 8-bits with Floyd-Steinberg dithering it can be difficult to see the difference from the original. Especially if the original is a highly detailed image WITHOUT large (seemingly) monocolored surfaces like a wall, a sky, etc. Detailed vistas with litte or no sky will give a very good result. Blurry indoor images will give the worst result. Remapped example images can be found in a different archive. Hint: 'pic/misc/jet_24to8examples.lha'. I decided not to act like a complete jerk and add 1MB with 24-bit and 8-bit before/after images to an archive that's less than 5K in size. However, the archive contain a tiny IFF-image which present the palette in multiple ways (I recommend using the zoom function of PPaint or DPaint when viewing it). 24to8.iff 4770 Bytes IFF-Image 24to8.pal 828 Bytes IFF-CMAP BTW, the time gap between the date of creation and the upload date have absolutely nothing to do with me getting the next free Aminet CD in a row =) Björn Östberg 99-11-26