In other words, to make your above code to compute brightness work from a
value returned by getPixel(), just change the few first line of the HSB
method from:
RGBtoHSB = function(rgb){
var r = rgb.r
var g = rgb.g
var b = rgb.b
...
to:
RGBtoHSB = function(var pixelvalue){
var r = pixelvalue
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
You seem to be thinking of numbers as if they are stored like strings.
They aren't.
RGB colors are stored as 3-byte (24-bit) numbers.
For example, red looks like this in binary:
b
...which is the same thing as this in hexadecimal:
0xFF
... which is the
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