Find percent value of a color between two known colors

Question

What is the best way to determine the percent value of a color between two given values. In other words, what is the best way to calculate the % position of color C?

Color A - 0x0000FF Color B - 0x00CCFF Color C - 0x00FFFF

Thanks!

Answer 1

well it's not that straight forward, because it depends on how you decide to quantize color.

You could do it through HSB, which is the more correct way in my opinion (though not necessarily a fact though) or just use the hex value.

quickest is probably to do it using the hax values

var colour:uint = 0x9900CC;
var r:uint = colour >> 16;
var g:uint = colour >> 8 & 0xFF;
var b:uint = colour & 0xFF;

.this will give you the value of each channel(c) (ABC being the colours)

then do the math for each channel (c)

(cB - cA)/(cC - cA)

then once you get each of these chanels, you can add them together and divide by 3.

there is one problem though, if Colour A and C are ever the same for any channel, you need to add an exception (because cC and CA are zero and you can't divide by zero), at that point you also need to decide how to handle that difference.