Using -strip and -profile together

[rasteiner]

ImageMagick version

ImageMagick 6.9.11-60

Operating system, version and so on

Ubuntu 22.04.2 LTS

Description

Should it be possible to use -strip and -profile together to remove all EXIF data, but keep the profile?

The usecase is to use ImageMagick (actually the PHP imagick extension, but the same issue seems to apply to the CLI) to resize images and at the same time stripping potentially sensitive data from the image in the context of a CMS (as in Content Management System).

The issue is that the -profile option seems to be ignored when used after the -strip option when producing a PNG file:

Works for JPG files:

identify -format %[profile:icc]\\n onigiri-adobe-rgb-gps.jpg # --> Adobe RGB (1998)
convert onigiri-adobe-rgb-gps.jpg extracted.icc
convert onigiri-adobe-rgb-gps.jpg -strip -profile extracted.icc clean.jpg
identify -format %[profile:icc]\\n clean.jpg # --> Adobe RGB (1998)

Doesn't work for PNG files:

identify -format %[profile:icc]\\n png-adobe-rgb-gps.png # --> Adobe RGB (1998)
convert png-adobe-rgb-gps.png extracted.icc
convert png-adobe-rgb-gps.png -strip -profile extracted.icc clean.png
identify -format %[profile:icc]\\n clean.png # --> unknown image property "%[profile:icc]"

For PNGs the -profile option seems to work when used without -strip:

identify -format %[profile:icc]\\n png-adobe-rgb-gps.png # --> Adobe RGB (1998)
convert png-adobe-rgb-gps.png extracted.icc
convert png-adobe-rgb-gps.png -strip clean.png
convert clean.png -profile extracted.icc clean.png
identify -format %[profile:icc]\\n clean.png # --> Adobe RGB (1998)

But this needs to encode the image twice, which isn't ideal in the context of a web request.

Is there maybe a workaround which doesn't involve encoding the image twice and doesn't rely on a third party tool (like Exiftool)?

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Here are the sample files:

• https://github.com/getkirby/kirby/blob/7cee6564bac5463275032bc2df5d3d399aa4be84/tests/Image/fixtures/image/onigiri-adobe-rgb-gps.jpg
• https://github.com/getkirby/kirby/blob/7cee6564bac5463275032bc2df5d3d399aa4be84/tests/Image/fixtures/image/png-adobe-rgb-gps.png