Path: utzoo!attcan!uunet!cs.utexas.edu!sun-barr!apple!bloom-beacon!EXPO.LCS.MIT.EDU!rws
From: rws@EXPO.LCS.MIT.EDU
Newsgroups: comp.windows.x
Subject: Re: DirectColor from xwd?
Message-ID: <8905241253.AA00853@expire.lcs.mit.edu>
Date: 24 May 89 12:53:34 GMT
References: <3279@ncar.ucar.edu>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 11


    Would someone please describe the DirectColor/TrueColor data format from
    an xwd dump.  (I wish to convert output from an Ardent Titan to another
    format.)

The data values in the image are pixels, just like for any other format.
You can use the red/green/blue_mask values in the header to decompose
the pixels into separate primaries.  In the case of DirectColor, the R3
xwd doesn't provide you with the colormap contents, so you just have to
assume that it's a direct ramp the same as TrueColor, that only gamma
correction was involved.  The R4 xwd will provide you the colormap contents.