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Gimp Transparency Issues

Aug 10, 2013, 12:02
Post: #1
Gimp Transparency Issues
Hi
Stupid question maybe but when I make an image transparent the brighter parts of the image are also made transparent which I obviously don't want.
I'm sure this probably involves fuzzy select maybe but I've spent ages trying to sort this out but can't make any sense at all of the tutorials.
Help!!!!!!!!!
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Aug 11, 2013, 12:04
Post: #2
RE: Gimp Transparency Issues
(Aug 10, 2013 13:12)ofnuts Wrote:  
(Aug 10, 2013 12:02)DarkStar Wrote:  Hi
Stupid question maybe but when I make an image transparent the brighter parts of the image are also made transparent which I obviously don't want.
I'm sure this probably involves fuzzy select maybe but I've spent ages trying to sort this out but can't make any sense at all of the tutorials.
Help!!!!!!!!!

When you make an image transparent, you obviously want to work on the whole image. If you want to obviously tell gimp to make only some part transparent, then you make an obvious selection on them Smile

Now, if what you want is make the dark parts of the image transparent:
  • Make sure you can be transparent: Layer/Transparency/add alpha channel
  • Create a layer mask: Layer/Mask/Add layer mask. Initialize to "grayscale copy of layer"
  • At that point the tools will act on the mask. In particular you can use:
    • The Threshold tool: everything with a luminosity above the treshold will be complely opaque, and everything below will be completely transparent
    • Levels, Curves, or Brightness/Contrast for more progressive transparency.
  • When happy with result, Layer/Mask/Apply layer mask

Hi
Thanks I'd never have worked that out!!!!! I'll give it a go.
Ta
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