I am making a photo editor app like apple photos, but I can't make a exactly straighten image filter I didn't figure what is the correct scale of a layer to fit a crop rect when applying CIStraightenFilter to fit image with crop rectangle.

How to calculate the scale factor of layer to fit crop rect when applying CIStraightenFilter?

Created Mar 31, 2022 Edited Mar 31, 2022

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I am making a photo editor app like apple photos, but I can't make a exactly straighten image filter

enter image description here

I didn't figure what is the correct scale of a layer to fit a crop rect when applying CIStraightenFilter to fit image with crop rectangle.

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