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Setting opacity for a selected area

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Setting opacity for a selected area

Postby mover50 » Wed Jul 27, 2011 2:46 pm

Is there a way to set the opacity for an area that is selected?

I have several layers. I know how to set the opacity for an entire layer, but I need
to set different opacity for each selected area within each layer.

Using gimp 2.6.10


Thanks and regards,

Kent
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Re: Setting opacity for a selected area

Postby David Wood » Wed Jul 27, 2011 4:11 pm

Just use the eraser with a lower opacity.
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Re: Setting opacity for a selected area

Postby dark lite » Wed Jul 27, 2011 4:21 pm

what i would do is cut and paste the area in to a new layer then adjust transiency to my liking

hope that works
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Re: Setting opacity for a selected area

Postby Arzoroc » Wed Jul 27, 2011 5:55 pm

Use layer masks!
Basically a layer mask is a sub-layer to one of your layers, which controls the opacity of every single pixel. White on the layer mask means full opacity on the real layer, black means full transparency. grey means 50% transparent, and a lighter grey gives you a bit more opacity. It sounds complicated but basically you paint on the layer mask with different greys and the darker the grey is, the more transparent the layer becomes on that part.

To create a layer mask, rightclick on your layer in the layers dialog and choose "Add layer mask". Once you clicked on the small preview image next to the layer preview image you can paint on the layer mask.


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Re: Setting opacity for a selected area

Postby mover50 » Wed Jul 27, 2011 7:41 pm

Did it the eraser way. Still trying to get a handle on how masks work.

Thanks,
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Re: Setting opacity for a selected area

Postby Rod » Wed Jul 27, 2011 11:30 pm

One thing you should learn about masks is their ability to create different levels of opacity with just a color between white ffffff and black 000000.

Black is full transparency and white is full opacity.
So if you use a mask Layer/Mask/Apply Layer Mask - select white full opacity - click the mask on the layer and it becomes active.You can now Edit/Fill with a solid 7f7f7f color, and it will be effectively 50% transparent. :)
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Re: Setting opacity for a selected area

Postby Maffe811 » Thu Jul 28, 2011 12:20 am

Rod wrote:One thing you should learn about masks is their ability to create different levels of opacity with just a color between white ffffff and black 000000.

Black is full transparency and white is full opacity.
So if you use a mask Layer/Mask/Apply Layer Mask - select white full opacity - click the mask on the layer and it becomes active.You can now Edit/Fill with a solid 7f7f7f color, and it will be effectively 50% transparent. :)


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Arzoroc wrote:White on the layer mask means full opacity on the real layer, black means full transparency. grey means 50% transparent, and a lighter grey gives you a bit more opacity. It sounds complicated but basically you paint on the layer mask with different greys and the darker the grey is, the more transparent the layer becomes on that part.
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Re: Setting opacity for a selected area

Postby Rod » Mon Aug 15, 2011 7:43 pm

yup pretty much the same thing.
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