Legacy ImageMagick Discussions Archive

Our photographer is complaining that whenever he tries and opens my IM tiffs in Photoshop it pops up a warning about pixel aspect ratio correction. I hadn't noticed this before because I don't use Photoshop. So I did some experimenting with my command lines and found the last step -compress Group4 is the culprit, no other compression formats I've tried make Photoshop emit this warning. Looking at the tiff header I see this:
I hate to ask this question because I've seen a lot of posts here on this same subject but I can't figure any of the answers out or apply them to my book page images. Because I use -trim the output size of each page image, the output size is a little different for each image so I need a solution that I can apply across all images or be able to calculate programmatically for each image.

Here is my command line for a sample image:
Removing the -compress option or changing it to LZW doesn't cause the warning.

I've experimented with using -density in various places, including after the -compress but it doesn't seem to make a difference.

My sample image can be found here:

http://ucblibrary4.berkeley.edu/~apollock/imagemagick

I did a few more tests. I also took a tiff I had saved in Photoshop as LZW compressed and did a few manipulations and saved as Group4 in ImageMagick but this time I did not get the Photoshop warning about pixel aspect ratio. So far it happens only when I start with the original camera raw format. I also forgot to mention I tried using -strip to remove the tiff header information but it didn't seem to work, i.e., the info was still there. I then removed it using a different program and also tried editing the X and YResolution fields using EXIFTool but in both cases I still got the Photoshop warning.