fix: redness

[philipjackson]

Description

Mixes RGB channels when creating thumbnails so they're no longer red.

Checklist:

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[lgtm-com[bot]]

This pull request introduces 3 alerts and fixes 1 when merging f8bd6e2ea91aba03366b1dba327fc889ae436d25 into dfa0445e1c55fb2ef779a35de0f5844d9be1687c - view on LGTM.com

new alerts:

• 3 for Syntax error

fixed alerts:

• 1 for Potentially inconsistent state update

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[philipjackson]

Is there some sort of test we can add? Also, does this need changing in ANNOTATE too as that was also red for me?

There's a separate issue for ANNOTATE that fixes the lack of green and blue channels there. Giving up on the test for now since there seems to be no way to use ImageBitmap in Jest/jsdom, and we can't test this code meaningfully without that. A selenium/Percy test for basic things like uploading an image and opening it in ANNOTATE would make more sense, if we can make it work stably. I'll make an issue for it.