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.

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

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

Step 4: Subtract circle from rectangle.

4.1 Select both circle and rectangle shape.

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

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

5.1 Select the Combined shape and

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

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.

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

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

Step 4: Subtract circle from rectangle.

4.1 Select both circle and rectangle shape.

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

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"