iOS 11 heic format adds artifacts to masked image

I'm using the new HEIC format to save a masked image to documents directory. When comparing to the PNG version of the same masked image I see that some new articafts have been added.

Here is a screenshot of the effected image:

Here's a link to working repository showcasing this issue (please view the generated image through the new ios 11 Files app). https://github.com/vondiplo/heic_wrong_encode

1 Answers

Answers 1

The mask provided in the git is an 100x98 px, try to use a bigger resolution image as mask that's the reason why there are artifacts, also keep in mind that PNG is uncompressed while hevc/heif is compressed so you can't really compare them.

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