This invention produces a realistic defocused image, without using traditional
ray tracing technique, by correctly converting the scale of original pixels to
the linear scale of amount of light and summing up defocused disks of every pixel
in an original image. The result of this process is bright and sparking defocused
disks of bright spots previously only possible with rays tracing technique and
completely missing in conventional imaging software. This invention enables a personal
user to create defocused images in order to create and increase the sense of field
depth, which is an important part of daily photographic and imaging work. The input
image can be scanned data from photographic films, data from digital cameras, or
computer generated images after three-dimensional rendering. A user can control
how the scale of pixel is converted to amount of light, which is equivalent to
altering film characteristics, and also can change the shape of an aperture in
order to make the defocusing effects meet his or her artistic taste.
