I'm not sure where your values come from so I can't say if your rowsPerStrip is ok but the rest looks right. I would rather read TIFFTAG_ROWSPERSTRIP directly than try to compute it, unless you're setting it yourself of course. Compression will not change the number of strips, only their size.
I don't know if you'll still need TIFFWriteDirectory() as I've never done exactly that. It should be obvious when trying it. Olivier Le jeu. 13 avr. 2023, à 08 h 52, David C. Partridge < [email protected]> a écrit : > So, I just need to add those tags with a number of entries equal to the > number to strips to be written, which I think I can work out like this: > > > > // > > // Work out how many scanlines fit into the default > strip > > // > > unsigned int rowsPerStrip = STRIP_SIZE_DEFAULT / > scanLineSize; > > > > // > > // From that we derive the number of strips > > // > > int numStrips = h / rowsPerStrip; > > // > > // If it wasn't an exact division (IOW there's a > remainder), add one > > // for the final (short) strip. > > // > > if (0 != h % rowsPerStrip) > > ++numStrips; > > is that still valid if compression is enabled? > > > > If I do that, I assume the internal code would update those tags, and I > would then need to call WriteDirectory immediately prior to Close? Or > would the automatic RewriteDirectory do it in place in the size hadn’t > changed? > > > > Thanks > > David >
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