Method for applying a vignette effect to rendered images

A computer-implemented method for processing image data that includes depth information, the method comprising:

• under the control of one or more computer systems configured with executable instructions:
• obtaining a scene description describing elements of a scene to be rendered into a rendered computer-generated image representable by a pixel array;
• determining, from the scene description, pixel values for the pixel array corresponding to a rendering of the scene, the pixel array comprising a plurality of pixel data elements, wherein each pixel data element of a pixel of the pixel array includes a pixel color value, a pixel alpha value, and a pixel depth value, and wherein each pixel data element has associated therewith an image position representing a position of its corresponding pixel in the rendered computer-generated image;
• obtaining an indication of a kernel image, wherein the kernel image comprises a kernel shape defining a shape of a bokeh effect;
• obtaining an indication of a control image, wherein the control image comprises a vignette shape defining a shape of a vignetting effect;
• overlaying the kernel image on the control image at a first position based on a shift value and multiplying the kernel image by the control image to obtain a first blur shape based on a first overlapping region between the kernel image and the control image, wherein the first overlapping region corresponds to a first region of the rendered image;
• blurring the rendered image to produce a blurred image, wherein the first region of the rendered image is blurred based on the first blur shape to produce a first blurred region;
• and
• multiplying each color value corresponding to a pixel in the first blurred region by a first intensity compensation value.