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2010.05.11 15:32 "Tiff with varying bit depths", by Thomas Richter
Hi folks,
I currently have a need to read and write TIFF files with a varying bit
depth. To be specific, this is a BGR565 image packed into TIFF:
$ tiffdump out.tif
out.tif:
Magic: 0x4949 <little-endian> Version: 0x2a
Directory 0: offset 8 (0x8) next 0 (0)
ImageWidth (256) LONG (4) 1<64>
ImageLength (257) LONG (4) 1<64>
BitsPerSample (258) SHORT (3) 3<5 6 5>
Compression (259) SHORT (3) 1<1>
Photometric (262) SHORT (3) 1<2>
StripOffsets (273) LONG (4) 1<140>
SamplesPerPixel (277) SHORT (3) 1<3>
RowsPerStrip (278) LONG (4) 1<64>
StripByteCounts (279) LONG (4) 1<8192>
SampleFormat (339) SHORT (3) 1<1>
Obviously, the library does not support this, but what are my options if
I need to read this file? I'm not too keen to write a tiff-parser
myself, unless I really really have to - and - I afraid - I really
really have to read this file in one way or another.
Is there a way to get at least hands on the raw stripe data without the
lib falling over? Failing that, what is the patch acceptance policy
for libTIFF? Would you accept a patch that adds support for this,
probably in a limited way?
Greetings,
Thomas