[Image-SIG] Question on TIFF EXTRASAMPLES tag support
bridgman at wyeth.gsfc.nasa.gov
Wed Sep 10 16:06:30 EDT 2003
We're using PIL for converting TIFFs generated by our animations into
additional products for web and video release. Today I encountered an
incompatible/unsupported TIFF format generated in one of our newer
processes. Setting the Image.DEBUG flag, I found that the file had:
format key: (2, 1, (8, 8, 8, 8), (1,))
- unsupported format
while apparently the nearest supported formats listed in
(2, 1, (8,8,8,8), (0,)): ("RGBX", "RGBX"),
(2, 1, (8,8,8,8), (2,)): ("RGBA", "RGBA"),
Apparently, this file has an incompatible 'EXTRASAMPLES'=1 flag but this
appears to be indicating the presence of an alpha channel.
After checking some additional references, I'm wondering what's the
difference between the EXTRASAMPLES=1 and RGBA? If there is no
significant difference, couldn't support for this format be installed by
(2, 1, (8,8,8,8), (1,)): ("RGBA", "RGBA"),
to the OPEN_INFO list in TiffImagePlugin.py?
Can anyone enlighten me?
Should this be installed in the distribution?
Other comments/suggestions? I'm no expert on PIL - I'm making this
determination based on one afternoon of study...
Dr. William T."Tom" Bridgman Scientific Visualization Studio
Global Science & Technology, Inc. NASA/Goddard Space Flight Center
Email: bridgman at wyeth.gsfc.nasa.gov Code 935
Phone: 301-286-1346 Greenbelt, MD 20771
FAX: TBD http://svs.gsfc.nasa.gov/
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