Photoshop deletes image data when transparency is present

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  • Updated 10 months ago
  • (Edited)
Why is it that photoshop, any version photoshop 3 and newer, deletes transparency information?



Example using the png file format:

Original png for the test

To test for yourself just save any of these image as pngs directly from this thread.


Now open that png in photoshop and do a Layer>Layer Mask>From Transparency and this is the result that you see showing the "hidden" info the "Transparency Channel" is "hiding".






Now open the original png again or undo the layer mask from transparency step and save out the png under a different name so you don't overwrite the original. Then open the newly saved png into photoshop and observe that the png looks exactly like the original.





However, if we go to Layer>Layer Mask>From Transparency, we see it's not like the original, in fact a huge amount of image data has been deleted by just opening and saving the png.




This seems to an issue not only with pngs, but with any file format that supports Transparency
in photoshop.
Photo of JEA

JEA

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Posted 10 months ago

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Photo of eartho

eartho, Champion

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That's really interesting. I can reproduce all of what you're showing here.
Do you know what application created the original png?
More than likely, Adobe is using a much older png spec which doesn't allow for that type of data inclusion.