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June 2005
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2005.06.07 19:15 "Re: Group4 compression & alpha channel", by Andrey Kiselev
Hi, Bob, > It has been observed that when GraphicsMagick writes a min-is-black > TIFF image with Group4 compression and an alpha channel (as an extra > sample) that the right half of the image is lost. The image > description is: > ... > I strongly suspect that this loss of data is due to libtiff but have > not done a thorough investigation yet to make absolutely sure. The > same occurs when using FAX compression. > > By simply not requesting Group4 or FAX compression, the file is saved > and read ok. This works: > ... > Are there any known issues in libtiff with this scenario? I do not remember any reports of such a bug. I think it is a matter for our Bugzilla. Regards, Andrey -- Andrey V. Kiselev Home phone: +7 812 5970603 ICQ# 26871517