ImageMagick's "convert" tool generates larger size file when run on specific "PNG" file.

Solution Unverified - Updated -


  • PNG files are ending up larger than the original when converting using convert command.
  • Problem is not seen with all PNG files but is specific to few PNG images.
  • Example:
# ll file_before_convert.png
-rw-r--r--. 1 root root 304293 Oct 21 17:04 file_before_convert.png
# /usr/bin/convert file_before_convert.png file_after_convert.png
# ll file_after_convert.png 
-rw-r--r--. 1 root root 739465 Oct 21 17:05 file_after_convert.png


  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • ImageMagick-6

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