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April 2006
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2006.04.14 16:48 "Re: TIFFReadScanline with JPEG compression", by Joris Van Damme
Jason, Jason Summers wrote: > I'm having trouble getting libtiff's TIFFReadScanline function to > work with: > > (1) grayscale old-JPEG images. Some scanlines succeed, but others fail > with a "LibJpeg: Improper call to JPEG library in state 0" error. This > is with the latest libtiff from CVS. It works fine if I use > TIFFReadEncodedStrip. > > (2) color new-JPEG images when using JPEGCOLORMODE_RGB. This used to > work for me, but it has stopped working in recent versions of libtiff, > at least for some images such as the quad-jpeg.tif sample. Using > TIFFReadEncodedStrip (without JPEGCOLORMODE_RGB) works fine. > > I know I may not be giving enough details. But is TIFFReadScanline > even *supposed* to work in these cases, or should I just give up and > always use the memory-hungry TIFFReadEncodedStrip? If your need is urgent, I recommend using strip access without JPEGCOLORMODE_RGB. That part was recently serviced, and should work fine (as you seem to indicate). For other approaches, please feel free to file a bug report in BugZilla, and post a follow-up with the exact URL of the BugZilla entry here. I'll try and deal with it as soon as I can. Best regards, Joris Van Damme info@awaresystems.be http://www.awaresystems.be/ Download your free TIFF tag viewer for windows here: http://www.awaresystems.be/imaging/tiff/astifftagviewer.html