Fixing png CRC errors on Linux

How to fix CRC errors with PNG files on Linux

To check whether an image has CRC errors you can run:
`optipng broken-image.png`

You will receive a warning similar to:
`Warning: iCCP: CRC error`

if your image has CRC errors.

To quick-fix the errors, you can use imagemagick, like so:
`convert broken-image.png broken-image-fix.png`

Rerunning `optipng` on the fixed image should confirm the removal of the CRC errors (and optimize the image):
`optipng broken-image-fix.png`


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