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Using a gradient mask to blur part of an image

Nov 29, 2010, 01:44
Post: #1
Using a gradient mask to blur part of an image
I have a photo and I would like to blur the bottom of the image while leaving the top of the image sharp, similar to limiting the depth of field by using a large f-stop. I created a gradient mask and then used Filters > Blur but it is not working. If I choose the layer that I created the mask on and choose blur, nothing happens. If I choose the layer (background) under the mask then the whole image blurs.

Can anyone offer a suggestion?

Thanks.
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Nov 29, 2010, 01:57 (This post was last modified: Nov 29, 2010 02:01 by ofnuts.)
Post: #2
RE: Using a gradient mask to blur part of an image
Try this:
- make sure your original layer has an alpha channel
- duplicate the layer
- apply blur to the copy (which is one top, normally)
- add a layer mask to the top layer
- put a black-to-white gradient on the layer mask, with the white where you want things blurred.

For added points, using the various color transform tools (in particular, the "curves" ones), you can change your linear gradient to something else, and so control how and where the blurring is applied (and see it in real time).

Now answering your questions on
https://Gimp-Forum.net
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Nov 29, 2010, 02:16
Post: #3
RE: Using a gradient mask to blur part of an image
That worked great.

Thanks!
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Feb 8, 2012, 02:52
Post: #4
RE: Using a gradient mask to blur part of an image
Worked nicely for me too, thanks
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