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I have a bitmap and I want to subtract a circle show the background gradient shows through. How can I do that?

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We can subtract a circle from image in sketch-app using a rectangle shape with hole (subtracted circle shape) as mask for the image (bitmap/ png/jpeg).

Example:

Step 1: Image above background gradient.

enter image description here

Step 2: Create a rectangle shape (black color used in example) with same size as image. Place it above image.

enter image description here

Step 3: Create a circle (white color used in example) above rectangle for the hole.

enter image description here

Step 4: Subtract circle from rectangle.

4.1 Select both circle and rectangle shape.

4.2 Select "Layer" > "Combine" > "Subtract"

enter image description here

Step 5: Select the "rectangle with hole" shape as mask for the image.

5.1 Select the Combined shape and image

5.2 Select "Layer" > "Mask" > "Use as mask"

enter image description here

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