Does anybody have any experience with the inner workings of libtiff?
I'm trying to use the libtiff library, but am having some problems and
was wondering if anybody could clarify something...
I have a small image with the following information:
Image #0: TIFF Directory at offset 0x8
Subfile Type: (0 = 0x0)
Image Width: 32 Image Length: 32
Resolution: 1, 1 (unitless)
Bits/Sample: 8
Compression Scheme: None
Photometric Interpretation: RGB color
FillOrder: msb-to-lsb
Orientation: row 0 top, col 0 lhs
Samples/Pixel: 4
Rows/Strip: 4
Planar Configuration: single image plane
When I call TIFFRGBAImageBegin(...), I find that it's setting the
"put" routine to be "putRGBcontig8bittile" since img->alpha == 0
due to extrasamples == 0. As far as I can tell, the routine
I need to be used is "putRGBAAcontig8bittile".
Has the image been encoded wrong (i.e. should "ExtraSamples" be
set to non-zero when alpha values are included)? It was written by a
major graphics package (Adobe Illustrator or something similar).
Have I just misunderstood something in the use of libtiff?
Am I making any sense at all? <grin>
Brian
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