Transparent black and black aren't the same color

[lucasmerlin]

I noticed that if parts of an image change from black (#000000FF) to transparent black (#00000000) dify doesn't notice any difference.
I believe pixelmatch has a smiliar issue: mapbox/pixelmatch#26

Someone recently opened a PR to fix this problem: mapbox/pixelmatch#142
Could we implement the same fix in dify?

[jihchi]

Hi @lucasmerlin. Thank you for the reference links.

Do you by any change have an example on hand that you can share with me so that I can reproduce and verify the issue?

[lucasmerlin]

Hi, sorry I should have provided the images from the start.
Dify considers these two identical:

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[jihchi]

Thank you @lucasmerlin ! I can reproduce the issue using the provided files. Let me investigate further.