Image processing includes: applying shader code to an original image to generate a blurred image version (BIV); obtaining a composite image that is generated based at least in part on the original image and the BIV, wherein the composite image is generated by: obtaining a mask that includes an unblurred region and a blurred region; applying the mask to combine the original image and the BIV to render a composite image that includes an unblurred portion comprising a portion of the original image corresponding to the unblurred region of the mask, and a blurred portion comprising a portion of the BIV corresponding to the blurred region of the mask; and outputting the composite image to be displayed.