In iOS 17+ you can select a subject in a photo and drag it out as a sticker. When copying or dragging these they are not resized so if the image was massive, the sticker will be massive.

When pasted into delta chat, we can natively detect that it has transparent corners and send it as sticker. Now when I send a sticker that is too big, core resizes it and it loses transparency and gains a black background. Preferably the sticker would be resized by core without losing transparency. If that is out of scope for core we can resize natively in iOS.

• Operating System: iOS 17
• Delta Chat Version: master
• Expected behavior: Stickers are resized without transparency loss
• Actual behavior: Stickers gain black background
• Steps to reproduce the problem: Drag (or copy) a subject from a large image to Delta Chat
• Screenshots:

• Logs: