Post Reply 

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.
Find all posts by this user
Quote this message in a reply
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).

[Image: 2Tvo0.png]

Find all posts by this user
Quote this message in a reply
Nov 29, 2010, 02:16
Post: #3
RE: Using a gradient mask to blur part of an image
That worked great.

Thanks!
Find all posts by this user
Quote this message in a reply
Feb 8, 2012, 02:52
Post: #4
RE: Using a gradient mask to blur part of an image
Worked nicely for me too, thanks
Find all posts by this user
Quote this message in a reply
Post Reply 


Possibly Related Threads...
Thread: Author Replies: Views: Last Post
Question help with blur for baseball swing goraiders 1 87 Mar 25, 2015 08:48
Last Post: ofnuts
  Image Rotation Question knotty 2 69 Mar 23, 2015 17:44
Last Post: knotty
  Paste an Image File justfred 4 190 Mar 12, 2015 08:44
Last Post: ofnuts
  Open - Fit Image in Window justfred 8 142 Mar 10, 2015 13:48
Last Post: rich2005
  Whats' best for web image optimization? chrisj 2 82 Mar 9, 2015 23:16
Last Post: ofnuts

Forum Jump:


GIMP ForumPortalArchiveContactTermsRSS