[FIX, #6928] bug/transparent-png-does-not-work-#6928 #6947
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[signalapp#6928] Transparent Png Doesn't Work (Even With Files) Add a failing test to show that in some cases uploading a png file results in a jpg being produced. [signalapp#6881] File size increase when sending images Add a passing test that automates the example written in the issue, where a file's size increases after uploading. Run with: npm run generate && npm run test-electron -- --grep="image processing" It does add an extra devDependency, hope that's okay. It's for inspecting jpeg images.
This does make the test pass, not sure if there are wider implications. Is there a reason png files need to be converted to jpeg sometimes?
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Contributor checklist:
mainbranchnpm run readyrun passes successfully (more about tests here)Run these new tests with:
Fix
All I have done is modify
ts/util/scaleImageToLevel.tsto preserve file type instead of hard-wiring to jpeg and the test passes.Not sure of other implications or possible reasons for changing png to jpg that I may have missed.
Before
Transparent pngs are re-rencoded as jpg and their backgrounds are black.
After
[6881] File size increase when sending images
While doing that I wondered about #6881 as well so added a characterizsation test for that which demonstrates the reported behaviour.
Not a fix just something to make pass.