Path: utzoo!attcan!uunet!hodge!jdm
From: jdm@hodge.UUCP (jdm)
Newsgroups: comp.graphics
Subject: Questions about the Sun raster image file format
Message-ID: <21639@hodge.UUCP>
Date: 24 Aug 89 04:01:06 GMT
Organization: Hodge Computer Research Corporation
Lines: 33


	I'm doing some conversion work involving Sun raster image files
	and I've not been about to find good answers to the following
	questions:

	1) If the ras_maptype is RMT_RAW how are the RGB values stored
	   in the colormap?  Are they RGBRGBRGBRGBRGBRGB (by pixel) as
	   opposed to RRRRRRRGGGGGGGGGBBBBBBB (by plane) when ras_maptype
	   is RMT_EQUAL_RGB?

	2) If ras_maptype is RMT_NONE is there any colormap data in the
	   file?  The man page for rasterfile says they colormap is
	   "empty" when ras_maptype is RMT_NONE.  Does this mean all the
	   values in the colormap are 0 or the colormap data just isn't 
	   in the file?

	3) How is the actual image data formatted when there is and isn't
	   a colormap?  With a colormap is each pixel just a byte that
	   contains an index into the colormap?  Without a colormap is
	   the RGB data stored a pixel at a time or a plane at a time?
	   (i.e. RGBRGBRGBRGBRGBRGBRGB versus RRRRRRRGGGGGGGBBBBBBB).


-- 

"I'm an anthropologist, not a computer systems architect, damit!"

jdm@hodge.cts.com [uunet zardoz crash]!hodge!jdm

James D. Murray, Ethnounixologist	TEL: (714) 998-7750 Ext. 129	
Hodge Computer Research Corporation	FAX: (714) 921-8038
1588 North Batavia Street 
Orange, California 92667  USA