rob@redcloud.ucar.edu (Robert P. Montgomery) (05/24/89)
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.) Thanks, Rob Montgomery (rob@ncar.ucar.edu) By the way, here is an example table of header values from a 3308850 byte- long file: window_name : Dore Window header_size : 114 file_version : 7 pixmap_format : ZPixmap pixmap_depth : 24 pixmap_width : 907 pixmap_height : 912 xoffset : 0 byte_order : MSBFirst bitmap_unit : 32 bitmap_bit_order : MSBFirst bitmap_pad : 32 bits_per_pixel : 32 bytes_per_line : 3628 visual_class : 5 red_mask : 16711680 green_mask : 65280 blue_mask : 255 bits_per_rgb : 24 colormap_entries : 256 ncolors : 0 window_width : 910 window_height : 910 window_x : 0 window_y : 0 window_bdrwidth : 1 National Center for Atmospheric Research / \ / \ /\ P.O. Box 3000 Boulder, CO 80307-3000 / \ \ / \ Machine: (303) 494-5142 / \ \ \ ___ Office: (303) 497-1832 rob@ncar.ucar.edu / N C A R \| |
rws@EXPO.LCS.MIT.EDU (05/24/89)
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.