Thanks very much for your response Martin but I don't understand it. I
don't
have three vars called R G and B. I just have a number which was retuned
from getPixel. Am I being stupid? I can't see how I should do what you
sugest. Pease explain a little further.
That number you're getting is a color. You're just seeing it in decimal
form, rather than hexadecimal form. It's the same thing. For example, the
value for white is either 16777215 or 0xffffff (the two are the SAME number,
just represented in two different ways).
On 0xffffff, the first "ff" pair is R, then G, then B. Like when you have
html color, "#ffffff".
To extract the single R G and B values from a color, simply apply Martin's
code to the color.
var color = 0xffc1e2; // or the one returned by getPixel, same thing
var r = color >> 16 & 0xFF
var g = color >> 8 & 0xFF
var b = color & 0xFF
Then R, G, and B will contain the values for each channel, going from 0 to
255.
Calculating brightness from that is one whole different matter, though.
- Zeh
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