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Re:FFmpeg 4.2 by evangow on Tuesday August 06, 2019 @06:04PM (#20630141)
I haven't used it, but I believe JIMP might work for you if you're looking for a JS solution to image manipulation

https://github.com/oliver-moran/jimp

Re:FFmpeg 4.2 by h1d on Tuesday August 06, 2019 @06:46PM (#20630426)
For images, you'd want to use a more performant 'sharp'.

https://github.com/lovell/sharp

Benchmark

https://sharp.pixelplumbing.com/en/stable/performance/