- 2010.05.11 15:49 "Re: [Tiff] Tiff with varying bit depths", by Frank Warmerdam
- 2010.05.11 15:58 "Re: [Tiff] Tiff with varying bit depths", by Bob Friesenhahn
2010.05.11 15:32 "[Tiff] 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