I have a lot of tif images in a directory. So I try to convert them into jpg format.

I use this command : mogrify -format jpg *.tif

But I get an error... an error for each image in fact:

mogrify: 2281.tif: unknown field with tag 37724 (0x935c) encountered. `TIFFReadDirectory' @ warning/tiff.c/TIFFWarnings/746.

Maybe I am doing something wrong... Does anyone have an idea?

  • @Sardathrion i don't see how that's going to be useful to the OP. not saying you might not have a point, but i really don't get what you're talking about. mogrify is convert, just different syntax. consider adding more information to your comment?
    – ixtmixilix
    Commented Jan 20, 2012 at 14:44
  • convert (convert and modify images) vs mogrify (in-place batch processing) from the documentation. I always used mogrify to change things in the images and convert to change the size/format. Mogrify can be dangerous and lead to strangeness as described here: imagemagick.org/Usage/basics/#mogrify. Sure, you can use mogrify and that's not a real answer the the question, thus a mere comment. Commented Jan 20, 2012 at 15:06

2 Answers 2


This is an informational error, are you sure that the file has been not converted?


  • Yep, I'm totally sure =)
    – Raphaël
    Commented Jan 20, 2012 at 10:57
  • Oh my god... I'm blind. The pictures are created... You have right ! So... I'ven't any bug. Sorry for annoying you ^^
    – Raphaël
    Commented Jan 20, 2012 at 11:00
  • If it's solved it's not annoying :-)
    – tmow
    Commented Jan 20, 2012 at 12:17

That tag marks private information about the image for Adobe Photoshop. Try flattening the image before exporting/saving.

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