Contrast (vision)
Videos
Contrast is the difference in luminance or color that makes an object distinguishable from a background. Human vision is more sensitive to relative differences than to absolute luminance, so perceived
Six renditions of a rocky shore photo with incremental contrast levels, clockwise from bottom left
The contrast in the left half of the image is lower than that in the right half.
A photograph of a leaf with several colors—the bottom image has an 11% saturation boost and around 10% increase in contrast.
Tour Eiffel Notre Dame
Defocus aberration
Videos
In optics, defocus is the aberration in which an image is simply out of focus. This aberration is familiar to anyone who has used a camera, videocamera, microscope, telescope, or binoculars. Optically
A photograph of Christmas lights with significant defocus aberration