Admittedly, i have never love front-end stuff although am pretty good writing HTML(5) / CSS(3) and JavaScript codes.
I stumbled on a cool form design few weeks ago and loved it. The color codes used for the CSS was in RGBA.
The color combination where pretty amazing but i wanted to alter their opacity and transparency to suit my need.
I have a local instance of a color picker that utilizes hexadecimal color. To be able to use it to alter the colors, i first need to convert the color from RGBA to Hex.
I found this particular flash tool (http://www.netgfx.com/RGBaZR/ handy when converting color codes from one form to the other.