[Image-SIG] PIL not loading some TIFF files?

[Green Bryan - bgreen]

Florian is completely correct.  I went down the wrong path and thanks to a typo thought I had the file loaded with PIL when I did not.  The PD/GEM people should still make sure the tags are updated correctly when writing a baseline tiff image.  You need to be able to handle ExtraSamples to claim that you can handle TIFF.

TIFF 6.0 Specification Final-June 3, 1992

These are the required fields for RGB images (in numerical order):
TagName Decimal Hex Type Value
ImageWidth 256 100 SHORT or LONG
ImageLength 257 101 SHORT or LONG
BitsPerSample 258 102 SHORT 8,8,8
Compression 259 103 SHORT 1 or 32773
PhotometricInterpretation 262 106 SHORT 2
StripOffsets 273 111 SHORT or LONG
SamplesPerPixel 277 115 SHORT 3 or more
RowsPerStrip 278 116 SHORT or LONG
StripByteCounts 279 117 LONG or SHORT
XResolution 282 11A RATIONAL
YResolution 283 11B RATIONAL
ResolutionUnit 296 128 SHORT 1, 2 or 3

The BitsPerSample values listed above apply only to the main image data. If
ExtraSamples are present, the appropriate BitsPerSample values for those
samples must also be included

-----Original Message-----
From: image-sig-bounces+bryan.green=acxiom.com at python.org [mailto:image-sig-bounces+bryan.green=acxiom.com at python.org] On Behalf Of Florian Höch
Sent: Wednesday, November 05, 2008 7:25 AM
To: image-sig at python.org
Subject: Re: [Image-SIG] PIL not loading some TIFF files?

Hello,

>> mask.tif loads fine:
>> 
>>>>> image = Image.open("mask.tif")
>>>>>
>> 
>> but store-00000.tif fails:

PIL does not support alpha channels in TIFF files.

Regards,

Florian
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