Implementations relate to generating and displaying blur in images. In some implementations, a method includes generating a plurality of mipmap images based on an input image, including applying a blur to a respective plurality of pixels derived from the input image for each mipmap image. In some examples, the blur is at least partially based on depth data for the image. Parameter data is obtained that indicates an output focal plane depth for an output focal plane of an output image and an output focal range in front of the output focal plane. Output pixel values of the output image are generated, including determining blurred pixel values based on one or more of the mipmap images selected based on the output focal plane depth and the output focal range. The blurred pixel values are based on particular pixels associated with a depth outside the output focal range.