Fix reference images for pillow 9.4

[mraspaud]

This PR should fix some reference images for compatibility with pillow 9.4

• Closes Test failure with Pillow 9.4 #82

[djhoese]

Darn it, I was going to do this. I was going to make a new compare_or_recreate_image function that recreated the test images if they didn't already exist (fail the test on recreation).

Anyway, I guess this looks good. Could/should the areas that you refactored out be fixtures? I guess it doesn't matter.

[mraspaud]

Darn it, I was going to do this. I was going to make a new compare_or_recreate_image function that recreated the test images if they didn't already exist (fail the test on recreation).

Yes, I tried this also, but I wanted this to be an option to pytest, but I couldn't find an elegant solution to have the file being saved on failure... Next time maybe.

Anyway, I guess this looks good. Could/should the areas that you refactored out be fixtures? I guess it doesn't matter.

I think they don't need to be. My hope is that by exposing those at the beginning of the file will promote the use of existing areas instead of creating new ones every time.

[djhoese]

Yes, I tried this also, but I wanted this to be an option to pytest, but I couldn't find an elegant solution to have the file being saved on failure... Next time maybe.

I thought it would require the developer to delete the failing images, rerun tests which generate the images but still fail, then rerun the tests which should now pass.

[djhoese]

My commit message is wrong, but the change is correct. I switched Python 3.7 to Python 3.8 in CI. Should I maybe bump 3.9 to 3.11?

[coveralls]

Coverage: 95.07% (+0.08%) from 94.993% when pulling 3506178 on mraspaud:fix_pil_rounding into 7038731 on pytroll:main.