Rep if used please ok to start first you copy and paste a picture that you've found here in photoshop i'll take a render of me,then you go to file-->new and make sure you check transparent beneath contents. then you click on the magic wand tool if you don't know where it is here's a picture. for this picture you set the tolerance to 10. then you click on the blue color(so allways click on the 1 coloured spots)and then you press delete on your keyboard done with that? you can start on your sig.
you have to use the easer tool with the little star thing on it to get transparency nice tutorial there by the way
photoshop 7.0 take the polygonnal lasso tool or if you got a pen for ersaing use that i'm going to get a pen
to fix this make a dupilcate layer of the top one then delete the background layer thats locked cause if you do not it will always make a forground color.with the locked layer gone it will be transparnet hoped that helped
Here's how I do it. I open up the image I want to make transparent, Select All, then Copy it. Then I bring up a new image, make sure the bg is on Transparent - It'll be the same size as the other one. Paste the new image into the transparent selection - Then get your magic wand tool, and click on the Green, or white or whatever color parts and then hit delete. It bring the transparent layer out.
Its good tutorial, but I will stay with pen tool, its harder and it takes more time but I think its better