Hi!
I'm trying to use LCMS 2 in 32-bit (float) mode to estimate conversion
performance and accuracy, but I'm unable to use tificc application for
32-bit conversion.
I've tried both MacOS X and FreeBSD8 boxes, in both cases the library
has compiled from sources (./configure && make && make install).
There is no problems with 8-bit and 16-bit images.
Test1 (try to convert 16-bit integer AdobeRGB tiff into 32-bit
floating-point sRGB one):
$ tificc -o*sRGB -w32 P16-Adobe.tif P32-srgb.tif
[tifficc]: Unsupported raster format
Segmentation fault: 11 (core dumped)
(P16-Adobe.tif is the 16-bit TIFF image produces by Adobe Photoshop).
Test2:
$ tificc -o*sRGB P32-Adobe.tif P32-srgb.tif
[tifficc]: Unsupported raster format
Segmentation fault: 11 (core dumped)
P32-Adobe - 32-bit TIFF from Adobe Photoshop saved as 32-bit (Float) and
without compression.
Tiffinfo utility from libtiff 3.9.4 identifies this file as:
Subfile Type: (0 = 0x0)
Image Width: 1003 Image Length: 1372
Resolution: 56.6667, 56.6667 pixels/cm
Bits/Sample: 32
Sample Format: IEEE floating point
Compression Scheme: None
Photometric Interpretation: RGB color
Orientation: row 0 top, col 0 lhs
Samples/Pixel: 3
Rows/Strip: 1372
Planar Configuration: single image plane
Software: Adobe Photoshop CS5 Windows
I've looked into tificc.c source code. It looks like the
GetInputPixelType() function does not packs FLOAT bit into format
bitfield. It returns
return
(COLORSPACE_SH(pt)|PLANAR_SH(IsPlanar)|EXTRA_SH(extra)|CHANNELS_SH(ColorChannels)|BYTES_SH(bps)|FLAVOR_SH(reverse));
I guess, this function should examine TIFFTAG_SAMPLEFORMAT field and
should return FLOAT_SH(...) in resulting bitfield.
But I'm not big LCMS specialist, I've only read documentation and try to
play with sample utilities, so it is possible I'm wrong.
Anyway, it will be good to support 32-bit float tiffs in tificc, at
least for testing purposes.....
--
Alex Tutubalin
Web: http://blog.lexa.ru
mailto:[email protected]
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