Gettng the html color of a co-ord in an image

I wish to get the html color of a picture say and co-ords 0,0 top left pixel?

is this possible? if so, how?

I browsed threw most of the image functions and found something close:

I closest thing I found was

http://us2.php.net/manual/en/function.imagecolorat.php


but that only returns the RGB values and not HTML values. How can I convert the RGB values to an HTML value?

See if this helps