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April 2006
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2006.04.14 14:59 "TIFFReadScanline with JPEG compression", by Jason Summers
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?