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Index › Programming Questions & Help › Programs › getting a color out of a PImage
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getting a color out of a PImage (Read 659 times)
signal
getting a color out of a PImage
Nov 15th, 2008, 1:51pm  
i'd like to get all colors out of a PImage into a 2 dimensional color array.
how can i get a color out of an image (using specified pixel coordinates)?
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PhiLho 
Re: getting a color out of a PImage
Reply #1 - Nov 15th, 2008, 7:58pm  
get() function. But actually, for faster run, read the page and look at loadPixels().
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signal
Re: getting a color out of a PImage
Reply #2 - Nov 17th, 2008, 8:34pm  
thanks, i am using .get() right now. but why do i get int values instead of color objects?
i want to iterate over an image pixel by pixel, get every color of the current pixel and then calculate the average color of the given image.

but when i calculate the average color of for example this mostly green image: http://www.photoschau.de/images/20060526231036_green_accumulation.jpg i get the int value -538, which is some kind of white-ish. what can i do?
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JohnG
Re: getting a color out of a PImage
Reply #3 - Nov 17th, 2008, 9:46pm  
You need to use red(col); (or green() or blue() ) on the int returned.

Within processing colours are actually stored as ints, 'color' is just a synonym for int really.

Each int is bade up of 32 bits, 8 each for opacity (alpha) red, green and blue, stuck together to make it easy to pass around internally.
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signal
Re: getting a color out of a PImage
Reply #4 - Nov 18th, 2008, 1:04am  
that was the problem! thanks!
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