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Asked: 2026-05-22T12:25:24+00:00

Thanks in advance. I know crop an image using CGRect value and masking .But

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Thanks in advance.

I know crop an image using CGRect value and masking .But now i want to create an app in that i will draw some shape using touches and drawRect method on a imageview and now i want to get only the part of an image within that shape only means i want to crop the original image into that shape. Is it possible to do.Do anyone have an idea about this.

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  1. Editorial Team

    1- Calculate the rectangular bounds of the shape.

    2- Extract a cropped sub-image of that size (or a couple of pixels over, depending on the app’s intent).

    Then you have some choices:

    a- You can change every pixel outside of the shape to white (or white, or blue, or whatever)
    b- You can set every pixel outside of the shape to transparent

    3- Save it.

    If you are really industrious you can even apply some dithering to the edge to smooth it out.

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