🚀 go-pugleaf

Linh Huynh worte to me as follows:

	It seems all binary operations do not work on binary images.
	For example I tried to erode binary image called ccitt-1.ras  using 
	this command

		berode < ccitt-1.ras > out.ras plus

	It reports:
	GetRasHeader: Input image must be 8 bits/pixel
	This one is 1 bits/pixels

This person's email address bounces back at my mailer daemon so I am
replying here. (Moreover, others have probably experienced the same
problem with my morph software.)



My programs operate only on 8-bit rasterfiles. Of course, the programs
would be better without that restriction. It should not be terribly
difficult to modify the routine ReadRasterFile in morph/utils/rasterio.c
to read 1-bit rasterfiles. In the meantime you can use pbmplus, zcat,
and compress in conjunction with the binary morph operators to do what
you want as follows:

	zcat ccitt-1.ras.Z | rasttopnm | pnmdepth 255 | pnmtorast -standard \
         | berode plus | rasttopnm | pgmtopbm | pnmtorast -standard \
         | compress -c > ccitt-1-erode.ras.Z

The "\"'s simply escape carriage returns.

I have tried this with the ccitt image and it works.

Be aware that you need a lot of memory to do this since the ccitt-N.ras.Z
images are very large.

Let me know if you have any other problems.

Alan Peters


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