How to make UIImage background color transparent?

How do you remove the background color from a UIImage and have an anti-aliased edge?

  • I've been able to knock out the background color of an UIImage using CGImageCreateWithMaskingColors, but the edge is very jagged. Does anyone know how to create a softer, anti-aliased edge programmatically?

  • Answer:

    It might not be that it's not being aliased right. It's more likely that the layer aspect ratio doesn't match the ratio of the main window and so the image dimensions are off.

Mohammed Islam at Quora Visit the source

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