List all graphic image files with find?

There are many types of graphic images in this huge archive such as .jpg, .gif, .png, etc. I don't know all the types. Is there a way with 'find' to be able to have it list all the graphic images regardless of their dot extension name? Thanks!

This should do the trick

find . -name '*' -exec file {} \; | grep -o -P '^.+: \w+ image'

example output:

./navigation/doc/Sphärische_Trigonometrie-Dateien/bfc9bd9372f650fd158992cf5948debe.png: PNG image
./navigation/doc/Sphärische_Trigonometrie-Dateien/6564ce3c5b95ded313b84fa918b32776.png: PNG image
./navigation/doc/subr_1.jpe: JPEG image
./navigation/doc/Astroanalytisch-Dateien/Gamma.gif: GIF image
./navigation/doc/Astroanalytisch-Dateien/deltaS.jpg: JPEG image
./navigation/doc/Astroanalytisch-Dateien/GammaBau.jpg: JPEG image

The following suits me better since in my case I wanted to pipe this list of files to another program.

find . -type f -exec file --mime-type {} \+ | awk -F: '{if ($2 ~/image\//) print $1}'

If you wanted to tar the images up (as someone in the comments) asked

find . -type f -exec file --mime-type {} \+ | awk -F: '{if ($2 ~/image\//) printf("%s%c", $1, 0)}' | tar -cvf /tmp/file.tar --null -T -

find . -type f -exec file {} \; | grep -o -P '^.+: \w+ image'

should even be better.

Grepping or using awk for "image" only will not do it. PSD-files will be identified by "Image" with a capital "I" so we need to improve the regexp to either be case insensitive or also include the capital I. EPS-files will not contain the word "image" at all so we need to also match for "EPS" or "Postscript" depending on what you want. So here is my improved version:

find . -type f -exec file {} \; | awk -F: '{ if ($2 ~/[Ii]mage|EPS/) print $1}'

Update (2022-03-03)

This is a refined version with the following changes:

1. Remove xargs.
2. Support filenames which contains : based on 林果皞's comment.

find . -type f |
  file --mime-type -f - |
  grep -F image/ |
  rev | cut -d : -f 2- | rev

---

Below is a more performant solution compared to the chosen answer:

find . -type f -print0 |
  xargs -0 file --mime-type |
  grep -F 'image/' |
  cut -d ':' -f 1

1. Use -type f instead of -name '*' since the former will search only files while the latter search both files and directories.
2. xargs execute file with arguments as many as possible, which is super fast compared to find -exec file {} \; which executes file for each found.
3. grep -F is faster since we only want to match fixed string.
4. cut is faster than awk (more than 5 times faster as I can recall).

Related to the same problem, I just published a tool called photofind (https://github.com/trimap/photofind). It behaves like the normal find-command but is specialized for image files and supports filtering of results also based on the EXIF-information stored within the image files. See the linked github-repo for more details.