creds rep apreciated for what? if u ever need to find the colour code for something, take a screen shot, and paste in photoshop, then use the eyedropper tool
Get the eyedropper extension for FireFox(assuming you're using it), it works just like the PhotoShop eyedropper, but you don't have to take a screenshot
Why bother even having a background on the image anyway? Just make a new transparent file the same size as the sig and paste it in there. Save it as a GIF and it should be transparent. HEX colours often look different in Firefox for example than what they do in IE.