Heavy processor load when selecting many (non contiguous) pixels

[gregors]

My new quad-core Intel i7 processor really works a lot when I select lots of discontinuous pixels (for example magic wand selection of dark leaves in an image with small leaves against a bright sky background). Any operations take a long time (several minutes) for each change of brightness or contrast or selecting anew to add to(subtract from the existing selection....

This severely limits the work I can do.

Does anybody else experience this and have a solution/workaround?

[skullbonz]

I'm assuming you are using "global" when using the magic wand to make the selection,,   try dialing the tolerance down a bit.

 

Oh, and the bigger the image,the longer it takes. Not sure if there is a limit on the size of image you can do that with in PDN before it freezes also.If there is you could be close to that.

Edited April 6, 2014 by skullbonz

[pdnnoob]

Simply put, if you are working with a very large image, things take longer to calculate.

I just have a few questions for you:

-What are the dimensions of the image in pixels?

-How many layers are you using?

-How much RAM do you have?

-What version of Paint.net are you using?

[Rick Brewster]

Magic wand is CPU intensive, especially in v3.5.

 

Try the 4.0 beta. The magic wand is still CPU intensive, but everything is done in a much more responsive way (asynchronously etc).