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To make a new logo:
1) Create the logo image by some means. Size should be no larger
than 512x512
2) Convert the image to FITS, scale it so pixel values are 0-200
3) Export to a raw 'logo.bin' file using the IRAF command:
cl> export logo.fits[*,-*] logo.bin raw outtype='b1' header-
We flip the image in Y due to the difference in location of the
origin.
4) Convert the binary logo.bin file to the header:
% mkhdr logo.bin > ../logo.h
5) Recompile the XImtool sources.
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