Color Picker Problems

Am I the only one experiencing this? Because I’ve searched Google and BlenderArtists forums regarding this and landed on nothing. I’m trying Blender’s chroma keying capabilities and whenever I use the color picker it returns black even if the color isn’t black. I pick colors from both the UV/Image editor and from the backdrop from nodes’ window. Is it prohibited to pick colors from these windows or what? I really hope someone could help me on this, it’s really becoming a hassle. Thanks. I’m using Windows 32 bit.