Image Opacity (Transparency)?

I don't know where to post this question but I put it here because iPhoto is at least a place of images.
Is there a way to control image opacity (or transparency) on my Mac?
Any help greatly appreciated.
Joe Aldrich

Leonie,
Thanks for the timely and helpful response to my question. As I was working with this area of Preview I saw the tool labeled Instant Alpha but I had no idea what Instant Alpha was about and could not get any help from Preview Help. I played with the Instant Alpha tool for a bit but I still don't understand its function. Adjust Color got me mostly what I was looking for as I was able to vary the color intensity of the image I was working with. I still didn't find a way to vary the opacity of the image so that I could be able to see through the image to what was behind it. At one time I was working with a drawing application that offered this feature. I am currently working with EasyDraw 7 for Mac.
Anyway, thanks for the help.
-Joe

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