Image search by color

Hi there,
I see on the net some neat image search sites that can search by color.
Like:http://labs.ideeinc.com/multicolr/#colors=d73224;
My question;
- How does this work?
- Can this be done in actionscript? (Flex or air)
- What do i need for this to work?
for example i have a directory on my server with a lot of images in it.
Now i want to use the neat color search to get me only the images with lets say the color red in it.
Please let me know what's the best way to acheive this.
Greets, J.

Hi, thank you for your post Matt.
If i have a correct understanding of your answer you would do something like this:
- Read image bitmapdata and calculate how much red, green and blue is in the image.
- store the percentages of red green and blue in the database for reference.
Should I also store the percentages of H, L and S ?
I found H,L and S in the below example of an advanced color picker.. i don't know yet what H,L and S means and what you can do with it..
http://www.sephiroth.it/test/flex/2/scolorpicker/index.html
I am also saving user input on the image..(What color the item on the picture has. 6 different colors by a color picker)
So when the user does a search by color, the script searches the percentage of used color in the picture and then the given color.
This way I don't get pictures of lets say flowers that does not exist in that color.
Would this be the correct way of handling a color search, or would you prefer another/better way?
How would you deal with color ranges?... when is the color still red and not brown or orange?
Greets, J.

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