Say I want to use a nice red colour I have seen. e.g that "tg" above ;-) So I copy and paste the image into my document.

Then I select the colour dropper tool in the colour editor and move the cursor onto the document to where the "tg" is. The whole document turns black but I'm not sure why! How do I get that nice red colour into my pallete?

(I've been through the colour tutorials - but can't see what I'm doing wrong)