I'm trying to adjust an image, a .png file. What I want to do is a gamma 
adjust, to lighten it.

In the past, I remember a program, I think it was called Core Image Fun House, 
or something like that, for doing that sort of thing; but that program is no 
longer around.

I did find some quartz composer transforms, including a gamma adjust, but that 
opens in Quartz Composer, and that will not actually let me supply a file to 
the transform. However, it tells me that I can use the transforms in Photobooth 
or iPhoto. So, try photobooth -- but as far as I can tell, that will only start 
with a camera picture, and I can't give it a file. So, try iPhoto. And ... how 
in the heck are you expected to use iPhoto / what does it actually do? In any 
event, I was able to drag the image in, apparently putting a copy of it into 
the library, but then I could not actually apply the quartz transforms.

But I did find, under Edit, sliders to adjust colors. I was able to get a "good 
enough" version, and then tried to save it. Err, Export it.

But the exported was a copy of the original, without any of the edits.

I cannot believe that a simple "apply this quartz filter", or "apply this color 
profile as an adjustment" (there is a lighten, and a darken, color profile for 
simple gamma adjusts), is this hard to do -- what  simple tool am I missing?

---
Entertaining minecraft videos
http://YouTube.com/keybounce

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