Image Coloring
Jan 05, 2016
Image Coloring
Halftone
Halftone is the reprographic technique that simulates continuous tone imagery through the use of dots, varying either in size, in shape or in spacing.
Examples of Color Halftoning with CMYK Separations
The first printed photo using a halftone(December 2, 1873)
Dithering
Dithering is a technique used in computer graphics to create the illusion of color depth in images with a limited color palette (color quantization)
Illusion of Dithering
256 color dithering with Irfan View
Original Image in Detail
Original image using the web-safe color palette with no dithering applied
Original image using the web-safe color palette with Floyd–Steinberg dithering
Original image has been reduced to a 256-color optimized palette with Floyd–Steinberg dithering
Depth is reduced to a 16-color optimized palette in this image, with no dithering
This image uses 16-color optimized palette with dithering
Original
Threshold
Random
Halftone
Ordered (Bayer)
Ordered (Void-and-cluster)
HSV Color Cylinder
YCrCb Sampling Format
YCrCb J:a:b
J: horizontal sampling reference (width of the conceptual region). Usually and in this case: 4.
a: number of chrominance samples (Cr, Cb) in the first row of J pixels
b: number of (additional) chrominance samples (Cr, Cb) in the second row of J pixels
YCrCb (4:4:4, 4:2:2, 4:2:0, 4:1:1)
YCrCb Sampling Format
4:2:0
4:4:4 4:2:2
4:1:1