Image coloring
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Image Coloring PowerPoint PPT Presentation


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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.

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Image Coloring

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Image coloring

Image Coloring


Halftone

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

Examples of Color Halftoning with CMYK Separations


The first printed photo using a halftone december 2 1873

The first printed photo using a halftone(December 2, 1873)


Dithering

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

Illusion of Dithering


256 color dithering with irfan view

256 color dithering with Irfan View


Original image in detail

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 no dithering applied


Original image using the web safe color palette with floyd steinberg dithering

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

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

Depth is reduced to a 16-color optimized palette in this image, with no dithering


This image uses 16 color optimized palette with dithering

This image uses 16-color optimized palette with dithering


Original

Original


Threshold

Threshold


Random

Random


Halftone1

Halftone


Ordered bayer

Ordered (Bayer)


Ordered void and cluster

Ordered (Void-and-cluster)


Hsv color cylinder

HSV Color Cylinder


Ycrcb sampling format

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 format1

YCrCb Sampling Format

4:4:4

4:2:2

4:2:0

4:1:1


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