How do you change brightness gradually?

[AndyGroom]

Hi,

I've got an image, I want to make one side darker than the rest of it, but like a gradual darkening.

I've done it before but can't remember how. I know it involved creating a gray-scale mask or transparency and then overlaying it over the image, but I can't recreate it!

Any tips?

- Andy
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[javabearSTL]

You could try using the interactive transparency tool, you could use a clipmask and use a gradient fill on the mask... there's probably a lot more you could do, but you've not mentioned what version of the app you're using, etc.