Legacy ImageMagick Discussions Archive

I am having trouble converting this file to pam format (http://en.wikipedia.org/wiki/File:Barns ... tetons.jpg)

convert Barns_grand_tetons.jpg barn.pam

identify barn.pam
identify: negative or zero image size `barn.pam' @ error/pnm.c/ReadPNMImage/417.

However, if I strip the profiles, it works fine.

convert Barns_grand_tetons.jpg -strip barn2.pam

identify barn2.pam
barn2.pam PAM 800x598 800x598+0+0 8-bit TrueColor sRGB 1.435MB 0.000u 0:00.000


Perhaps NetPBM formats should automatically strip the profile if that is a problem or IM should give a warning or error message when trying to write the file.

We cannot reproduce the problem. The PAM file created by 6.8.5-6 is correct for us. Its header looks like this:

• P7
  WIDTH 1600
  HEIGHT 1195
  DEPTH 3
  MAXVAL 255
  TUPLTYPE RGB
  ENDHDR

I downloaded it again and tried and got the same error message. Perhaps it is an issue only to the Mac OS?

I can open the file in my text editor and it shows:


P7
#File source: http://commons.wikimedia.org/wiki/File: ... tetons.jpg
WIDTH 800
HEIGHT 598
DEPTH 3
MAXVAL 255
TUPLTYPE RGB
ENDHDR


followed by data.

But identify still gives the same error message

CORRECTION:

If I download the full size file rather than pull the displayed image, it works fine.

try this file, which is the smaller one

http://www.fmwconcepts.com/misc_tests/p ... tetons.jpg

convert 800px-Barns_grand_tetons.jpg barn.pam

identify barn.pam
identify: unable to open image `barn.jpg': No such file or directory @ error/blob.c/OpenBlob/2644.


It may just be some corruption in the jpg, though it displays fine.

Note it works fine even with the last image if I remove the meta data via -strip

Looks like it doesn't like the image comment. We'll add a patch by sometime tomorrow.

magick wrote:Looks like it doesn't like the image comment. We'll add a patch by sometime tomorrow.

No rush on this. Just wanted to understand what was going on. Thanks

Actually that is PbmPlus 'comment' and probably should be preserved in IM as a possible multi-line 'comment'.

This problem appears to be fixed in IM 6.8.5.7 Q16 Mac OSX Snow Leopard

Thanks

Agreed. but not quite right when multi-line comments are used.

generate a multi-line comment -- GOOD Read with multi-line comment -- BAD It has lost the newline between the words!

It should have come out like this generation also fails to preserve a newline on the end of a comment That last is valid PbmPlus format (binary (compressed) form is also valid), just does not preserve the final newline in comment quite right.

We can reproduce the problem you posted and have a patch in ImageMagick 6.8.5-8 Beta available by sometime tomorrow. Thanks.