Posted: Thu Mar 11, 2010 9:01 pm Post subject: Why is PS allowing paint to spill outside of selections?
So, I have an image at high resolution. I want to cut an object out of the image, and then scale the image down to a smaller size. Now, when I command-click my cut out object, I receive a selection.
However, when I try to paint within that selection, paint spills out onto pixels that are Not part of the selection. Does anyone know why this is happening? With the work I'm doing, it's imperative that the only part of my image that is being manipulated is my exact selection, and not a pixel over. But I can't understand why Photoshop is allowing a few pixels outside of my selection border to be painted on.
Furthermore, if I were to do command-click my object for the selection and delete it out of the background image, it deletes the selection + a few extra pixels around the border. It's maddening. When I have a selection and manipulate the pixels within it, why is it also manipulating a small number of pixels surrounding the selection?
Posted below is a video I made to demonstrate the problem. I start with a higher res image, cut out the picture, cut the image size in half, and then command-click my object to get its selection. Then if I delete that object out of the original image, it does 2 things: 1) deletes more than my selection and 2) doesn't delete what's IN the selection entirely. The edge of the selection in some spots become transparent instead of it being gone.
There wasn't any feathering going on and I can't use anti-aliasing with what I'm doing. But this is exactly what I'm trying to accomplish. This video should be a much better demonstration of my problem. If you wouldn't mind, could you please take a look and give me your thoughts?
Joined: 24 Sep 2007
Posts: 3515
Location: Haverhill, UK PS Version: Lightroom 5, CS4 & Elements 11 OS: Windows 8.1
Posted: Tue Mar 16, 2010 2:43 pm Post subject: Re: Why is PS allowing paint to spill outside of selections?
Hi foxdog,
foxdog175 wrote:
However, when I try to paint within that selection, paint spills out onto pixels that are Not part of the selection. Does anyone know why this is happening?
I had a quick look at your video, and to me it looks like the trade off between having anti-aliasing on, and having it off.
You can see this yourself by making 2 small selections with the Lasso Tool, one with anti-aliasing on, and the other with it off. Now use a hard brush to paint inside the selection and you'll see that the anti-aliased one allows an overspill, and aliased one doesn't.
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