Output of tiled tiff causes weird artifact in one tile

[morgon]

Running the following command on the attached tif: gdal_translate -co TILED=YES -co BLOCKYSIZE=256 -co BLOCKXSIZE=256 input.tif output.tif

Causes strange permutations of a certain tile on the right-most side of the image.

Problem is not just in gdal_translate; using the programming API to accomplish the same thing causes the same problem.

Tested with GDAL 1.5.2 and svn-trunk, all with both internal TIFF library and external TIFF library (version 3.8.2).

[morgon]

input image that causes bad output with TILED=YES BLOCKYSIZE=256 BLOCKXSIZE=256

[morgon]

Example output from gdal_translate, version 1.5.2, using internal tiff. Output is the same in other versions. Gzipped so I could upload it.

[Even Rouault]

I've downloaded your input and output images, and both have the exact checksums (gdalinfo -checksum ) and they show up the same way, and fine, in OpenEV (I could only display the gray band, as OpenEv doesn't handle natively images made of gray + alpha band.). It is displayed correctly by QGIS and gimp too.

My guess is that your viewer cannot handle those images correctly, probably because of the not-so-common combination of a gray band + alpha band.

[morgon]

Blah. I hadn't expected both ImageMagick's "display" and gqview to fail in the exact same way (especially as they seem to use different back-ends). Shows up fine in the gimp, like you said...my bad.