We are seeing a problem which I suspect is a manifestation of the same
bug. I have an image called 'scan.tif' which appears perfectly normal
when viewed in eog or Gimp. When I try to convert it to PNG with
graphicsmagick I get the following error:
$ gm convert scan.tif scan.png
gm convert: scan.tif: Bad code word at line 63 of strip 19 (x 1535).
(Fax4Decode).
The conversion command and the source TIFF are part of our application's
automated regression test suite. This error appeared following the
update of libtiff4 to 3.9.4-5+squeeze2
The source TIFF file was sent to us electronically from a document
scanning bureau some years ago.
I can supply the image directly to a developer if it would help but
would prefer not to attach to a public bug report due to confidential
nature of the document in the scan.
ImageMagick also now complains about this file:
$ identify -verbose scan.tif
Image: scan.tif
Format: TIFF (Tagged Image File Format)
Class: DirectClass
Geometry: 1536x2370+0+0
Resolution: 200x200
Print size: 7.68x11.85
Units: PixelsPerInch
Type: Bilevel
Base type: Bilevel
Endianess: MSB
Colorspace: RGB
Depth: 1-bit
Channel depth:
gray: 1-bit
Channel statistics:
Gray:
min: 0 (0)
max: 1 (1)
mean: 0.91813 (0.91813)
standard deviation: 0.274167 (0.274167)
kurtosis: 7.30366
skewness: -3.05019
Histogram:
298033: ( 0, 0, 0) #000000 black
3342287: (255,255,255) #FFFFFF white
Rendering intent: Undefined
Interlace: None
Background color: white
Border color: rgb(223,223,223)
Matte color: grey74
Transparent color: black
Compose: Over
Page geometry: 1536x2370+0+0
Dispose: Undefined
Iterations: 0
Compression: Group4
Orientation: TopLeft
Properties:
date:create: 2011-06-14T13:41:21+12:00
date:modify: 2011-06-14T13:41:21+12:00
signature: ba226183d39e5667578648d34a557bc7f5f65cb5623652aadc5df338c6627035
tiff:document: /home/grant/eec/00020876.TIFF
tiff:photometric: min-is-white
tiff:rows-per-strip: 64
Artifacts:
verbose: true
Tainted: False
Filesize: 49.3KB
Number pixels: 3.64MB
Pixels per second: 40.45MB
User time: 0.060u
Elapsed time: 0:01.089
Version: ImageMagick 6.6.0-4 2010-11-16 Q16 http://www.imagemagick.org
identify: scan.tif: Bad code word at line 4 of strip 19 (x 0). `Fax4Decode' @
warning/tiff.c/TIFFErrors/493.
identify: scan.tif: Premature EOL at line 4 of strip 19 (got 0, expected 1536).
`Fax4Decode' @ warning/tiff.c/TIFFWarnings/703.
identify: scan.tif: Bad code word at line 7 of strip 19 (x 12). `Fax4Decode' @
warning/tiff.c/TIFFErrors/493.
identify: scan.tif: Premature EOL at line 7 of strip 19 (got 12, expected
1536). `Fax4Decode' @ warning/tiff.c/TIFFWarnings/703.
identify: scan.tif: Line length mismatch at line 10 of strip 19 (got 1564,
expected 1536). `Fax4Decode' @ warning/tiff.c/TIFFWarnings/703.
identify: scan.tif: Line length mismatch at line 18 of strip 19 (got 1540,
expected 1536). `Fax4Decode' @ warning/tiff.c/TIFFWarnings/703.
identify: scan.tif: Line length mismatch at line 24 of strip 19 (got 1537,
expected 1536). `Fax4Decode' @ warning/tiff.c/TIFFWarnings/703.
identify: scan.tif: Line length mismatch at line 28 of strip 19 (got 1537,
expected 1536). `Fax4Decode' @ warning/tiff.c/TIFFWarnings/703.
identify: scan.tif: Line length mismatch at line 29 of strip 19 (got 1552,
expected 1536). `Fax4Decode' @ warning/tiff.c/TIFFWarnings/703.
identify: scan.tif: Line length mismatch at line 30 of strip 19 (got 1574,
expected 1536). `Fax4Decode' @ warning/tiff.c/TIFFWarnings/703.
identify: scan.tif: Line length mismatch at line 31 of strip 19 (got 1537,
expected 1536). `Fax4Decode' @ warning/tiff.c/TIFFWarnings/703.
identify: scan.tif: Bad code word at line 32 of strip 19 (x 33). `Fax4Decode' @
warning/tiff.c/TIFFErrors/493.
identify: scan.tif: Premature EOL at line 32 of strip 19 (got 33, expected
1536). `Fax4Decode' @ warning/tiff.c/TIFFWarnings/703.
identify: scan.tif: Line length mismatch at line 33 of strip 19 (got 1538,
expected 1536). `Fax4Decode' @ warning/tiff.c/TIFFWarnings/703.
identify: scan.tif: Bad code word at line 50 of strip 19 (x 1535). `Fax4Decode'
@ warning/tiff.c/TIFFErrors/493.
identify: scan.tif: Premature EOL at line 50 of strip 19 (got 1535, expected
1536). `Fax4Decode' @ warning/tiff.c/TIFFWarnings/703.
identify: scan.tif: Line length mismatch at line 52 of strip 19 (got 1542,
expected 1536). `Fax4Decode' @ warning/tiff.c/TIFFWarnings/703.
identify: scan.tif: Line length mismatch at line 59 of strip 19 (got 1537,
expected 1536). `Fax4Decode' @ warning/tiff.c/TIFFWarnings/703.
identify: scan.tif: Bad code word at line 63 of strip 19 (x 1535). `Fax4Decode'
@ warning/tiff.c/TIFFErrors/493.
identify: scan.tif: Premature EOL at line 63 of strip 19 (got 1535, expected
1536). `Fax4Decode' @ warning/tiff.c/TIFFWarnings/703.
Regards
Grant
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