Color separation: Difference between revisions

* Given an image, create four images, one for each color separated in the CMYK model. It is not required to implement ICC profiles. Note: there is not a unique algorithm to convert from RGB to CMYK, several algorithms have been developed according to special optimizations, you can use whatever you like. The simplest one is called "rough" or "naive", see [https://peteroupc.github.io/colorgen.pdf this, page 23].

 

 

{{FormulaeEntry|page=https://formulae.org/?script=examples/Color_separation}}

 

 

[[File:Fōrmulæ - Color separation 03.png]]

 

'''Color separation in CMY model'''

 

[[File:Fōrmulæ - Color separation 06.png]]

 

'''Color separation in CMYK model'''

 

[[File:Fōrmulæ - Color separation 09.png]]

 

=={{header|Wren}}==

{{libheader|DOME}}

First the script for the RGB model with the original image shown first.

import "graphics" for Canvas, Color, ImageData

 

Window.title = "Color separation, RGB model"

var fileName = "Lenna50.jpg"

var w = image.width

var h = image.height

 

var Game = ColorSeparationRGB.new()</syntaxhighlight>

 

Next the script for the CMY model with the original image shown first.

import "graphics" for Canvas, Color, ImageData

 

Window.title = "Color separation, CMY model"

var fileName = "Lenna50.jpg"

var w = image.width

var h = image.height

 

var Game = ColorSeparationCMY.new()</syntaxhighlight>

 

Finally, the script for the CMYK model with the original image shown first, in the top row.

 

I've had to borrow the Fōrmulæ image for this one as the red component of the pixels in the previous image is such that the 'C' image seems to come out completely white.

import "graphics" for Canvas, Color, ImageData

 

class ColorSeparationCMYK {

Window.title = "Color separation, CMYK model"

var fileName = "lady.png"

var w = image.width

var h = image.height

var gc = 255 - col.g

var bc = 255 - col.b

var kc = 255 - k

if (kc != 0) {

imgY.pset(i, j, Color.rgb(255, 255, 255-y))

} else {

}

imgK.pset(i, j, Color.rgb(kc, kc, kc))

 

var Game = ColorSeparationCMYK.new()</syntaxhighlight>