https://www.temlib.org/AtariForumWiki/index.php?action=history&feed=atom&title=RGB_Intermediate_file_formatRGB Intermediate file format - Revision history2026-05-06T18:51:41ZRevision history for this page on the wikiMediaWiki 1.39.2https://www.temlib.org/AtariForumWiki/index.php?title=RGB_Intermediate_file_format&diff=16638&oldid=prev>Lp: moved RGB Intermediate Format to RGB Intermediate file format: For consistency2017-01-03T00:31:45Z<p>moved <a href="/AtariForumWiki/index.php/RGB_Intermediate_Format" class="mw-redirect" title="RGB Intermediate Format">RGB Intermediate Format</a> to <a href="/AtariForumWiki/index.php/RGB_Intermediate_file_format" title="RGB Intermediate file format">RGB Intermediate file format</a>: For consistency</p>
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RGB Intermediate Format *.RGB (low resolution only)<br />
<br />
This format was invented by Lars Michael to facilitate conversions between<br />
standard ST picture formats and higher resolution formats like GIF and IFF.<br />
It supports 12 bits of color resolution by keeping the red, green and blue<br />
components in separate bit planes.<br />
<br />
1 word resolution (ignored)<br />
16 word palette (ignored)<br />
16000 words red plane (screen memory)<br />
1 word resolution (ignored)<br />
16 word palette (ignored)<br />
16000 words green plane (screen memory)<br />
1 word resolution (ignored)<br />
16 word palette (ignored)<br />
16000 words blue plane (screen memory)<br />
------------<br />
96102 bytes total<br />
<br />
The format was derived by concatenating three DEGAS .PI1 files together -- <br />
one for each color gun. The RGB value for a pixel is constructed by looking<br />
at the appropriate pixel in the red plane, green plane, and blue plane. The<br />
bitplanes are in standard ST low resolution screen RAM format, but where pixel<br />
values in screen RAM refer to palette entries (0 through 15), pixel values<br />
here correspond to absolute R, G, and B values. The red, green, and blue<br />
components for each pixel range from 0 to 15 (4 bits), yielding a total of<br />
12 bits of color information per pixel. Not coincidentally, this is exactly<br />
the format of ST palette entries (although on ST's without the extended <br />
palette only the lower 3 bits of each color component are used).<br />
<br />
You can view a single bit plane on a standard ST by splitting the .RGB file<br />
into its three DEGAS .PI1 components and setting the palette to successively<br />
brighter shades of gray.<br />
</pre><br />
Back to [[ST Picture Formats]]</div>>Lp