Processing 1.0 - Processing Discourse - Accessing 1 color component

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Index › Programming Questions & Help › Syntax Questions › Accessing 1 color component

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Accessing 1 color component (Read 493 times)

Louen YaBB Newbies Offline Posts: 16	Accessing 1 color component Jun 7^th, 2009, 8:05am Hi, I've got a simple question, how can I access a single color component and put it into a variable? (int value for example). Either in RGB or HSB. Each variable has 3 components. Actually, Id like to access B from HSB. Thanx in advance.

mots Junior Member Offline Posts: 62	Re: Accessing 1 color component Reply #1 - Jun 7^th, 2009, 8:53am i use this convert from HSB to RGB : (java.awt.color.Color) rgb = new Color(Color.HSBtoRGB(fgH.v(),fgS.v(),fgB.v())); foregroundR = rgb.getRed(); foregroundG = rgb.getGreen(); foregroundB = rgb.getBlue(); the other way around : float[] hsb = Color.RGBtoHSB(r, g, b, null);

Louen

Re: Accessing 1 color component
Reply #2 - Jun 7^th, 2009, 9:04am

Im not sure I fully understand your code :S. Still what I meant is, not converting from one to another, just something like:

Imagine I had:

color currColor = video.pixels[100];

(that would give me color in RGB , range from 0 to 255, of a specific pixel from the video Im working with)

Now I want to get JUST the red componente from that variable (currColor). And put into an int variable.
How could I get it?

It tried:

colorR = currColor.getRed();

after seeing you code, but that wont work, do you know how I can do it?

Thank you.

PhiLho YaBB Moderator Offline Posts: 4190 Near Paris (France)	Re: Accessing 1 color component Reply #3 - Jun 7^th, 2009, 12:18pm See the red(), green() and blue() functions. If you need speed, you must use binary operators: & mask and >> shift.

Rapatsk1 Junior Member Offline Posts: 99 www.tiemenrapati.com	Re: Accessing 1 color component Reply #4 - Jun 7^th, 2009, 2:04pm PhiLho wrote on Jun 7^th, 2009, 12:18pm: If you need speed, you must use binary operators: & mask and >> shift. Shortcut to make it easy: Code: int r = img.pixels[pix] >> 16 & 0xFF; int g = img.pixels[pix] >> 8 & 0xFF; int b = img.pixels[pix] & 0xFF; with the loadPixels() on img.

Louen YaBB Newbies Offline Posts: 16	Re: Accessing 1 color component Reply #5 - Jun 7^th, 2009, 4:49pm Those were easy operators haha. Dunno why I didnt find them :S I've even got a processing book with me xD (Im new at it) but I was looking in the wrong place... Thanx a lot

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