problem saving tif files with PIL
mchl gdbt
mchlgdbt at hotmail.com
Fri Apr 8 15:39:44 EDT 2005
Hi,
I have several thousand tiffs generated by application A which are read by
application B. I need to remove a few colours from the tiffs and I decided
to try with the python imaging library.
Running under debug mode permits saving my tiff files (with Image.DEBUG=0,
the save doesn't work! see below) , but it truncates the crazy tags in my
tiff and changes the resolution of the image
I realized the resolution had changed when app B spit out garbage and
checked in GIMP which confirmed that the resolution had been changed. The
number of pixels is the same. it went from 96x96ppi as 11.771 x 9.771 to
72 x 72ppi at 15.694 x 13.028, so # of pixels 1130 x 938
Ideally, I want the output image to be identical to the original in every
way. I suspect that it might be enough to just change the size numbers
though I don't know how. I will be messing around with the pixel colours
eventually but the structure of the image must remain basically identical so
that application B works as before.
Any suggestions?
Thanks for any help,
Michael
This the screen output from my idle run.
1) open image
2) save image (doesn't work)
3) debug = 1
4) open image
5) save image (works) fewer tags it seems
6) reload saved image, fewer tags, different resolution, though this is not
apparent within python
im = Image.open(r"c:\image1.tif")
>>>im.save("C:\\test.tif")
Traceback (most recent call last):
File "<pyshell#9>", line 1, in ?
im.save("C:\\test.tif")
File "C:\Local Program Files\Python23\lib\site-packages\PIL\Image.py",
line 1136, in save
SAVE[string.upper(format)](self, fp, filename)
File "C:\Local Program
Files\Python23\lib\site-packages\PIL\TiffImagePlugin.py", line 677, in _save
offset = ifd.save(fp)
File "C:\Local Program
Files\Python23\lib\site-packages\PIL\TiffImagePlugin.py", line 356, in save
data = string.join(map(o32, value), "")
File "C:\Local Program
Files\Python23\lib\site-packages\PIL\TiffImagePlugin.py", line 55, in ol32
return chr(i&255) + chr(i>>8&255) + chr(i>>16&255) + chr(i>>24&255)
TypeError: unsupported operand type(s) for &: 'str' and 'int'
Image.DEBUG=1
>>>im = Image.open(r"c:\image1.tif")
tag: NewSubfileType (254) - type: long (4) - value: (2,)
tag: ImageWidth (256) - type: long (4) - value: (1130,)
tag: ImageLength (257) - type: long (4) - value: (938,)
tag: BitsPerSample (258) - type: short (3) - value: (8, 8, 8)
tag: Compression (259) - type: short (3) - value: (1,)
tag: PhotometricInterpretation (262) - type: short (3) - value: (2,)
tag: StripOffsets (273) - type: long (4) - value: (3980, 10760, 17540,
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tag: Orientation (274) - type: short (3) - value: (1,)
tag: SamplesPerPixel (277) - type: short (3) - value: (3,)
tag: RowsPerStrip (278) - type: long (4) - value: (2,)
tag: StripByteCounts (279) - type: long (4) - value: (6780, 6780, 6780,
6780, 6780, 6780, 6780, 6780, 6780, 6780, 6780, 6780, 6780, 6780, 6780,
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6780, 6780, 6780, 6780, 6780, 6780, 6780, 6780, 6780, 6780)
tag: XResolution (282) - type: rational (5) - value: ((96, 1),)
tag: YResolution (283) - type: rational (5) - value: ((96, 1),)
tag: PlanarConfiguration (284) - type: short (3) - value: (1,)
tag: ResolutionUnit (296) - type: short (3) - value: (2,)
tag: PageNumber (297) - type: short (3) - value: (0, 0)
*** Summary ***
- compression: raw
- photometric_interpretation: 2
- planar_configuration: 1
- size: (1130, 938)
format key: (2, 1, (8, 8, 8), ())
- raw mode: RGB
- pil mode: RGB
>>>im.save("C:\\test.tif")
save: ImageWidth (256) - value: (1130,)
save: ImageLength (257) - value: (938,)
save: BitsPerSample (258) - value: (8, 8, 8)
save: Compression (259) - value: (1,)
save: PhotometricInterpretation (262) - value: (2,)
save: StripOffsets (273) - value: (0,)
save: SamplesPerPixel (277) - value: (3,)
save: RowsPerStrip (278) - value: (938,)
save: StripByteCounts (279) - value: (3179820,)
imnew= Image.open("C:\\test.tif")
tag: ImageWidth (256) - type: short (3) - value: (1130,)
tag: ImageLength (257) - type: short (3) - value: (938,)
tag: BitsPerSample (258) - type: short (3) - value: (8, 8, 8)
tag: Compression (259) - type: short (3) - value: (1,)
tag: PhotometricInterpretation (262) - type: short (3) - value: (2,)
tag: StripOffsets (273) - type: long (4) - value: (128,)
tag: SamplesPerPixel (277) - type: short (3) - value: (3,)
tag: RowsPerStrip (278) - type: short (3) - value: (938,)
tag: StripByteCounts (279) - type: long (4) - value: (3179820,)
*** Summary ***
- compression: raw
- photometric_interpretation: 2
- planar_configuration: 1
- size: (1130, 938)
format key: (2, 1, (8, 8, 8), ())
- raw mode: RGB
- pil mode: RGB
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