Polygonal Lasso selection not effecting full area inside selection

[rjh0016]

When making a particular selection with the polygonal lasso tool, I've selected the entire area I need to work on, but when I go to make adjustments, only a large triangle about half the size of the space inside the selection is effected. I copied and pasted the selection onto a new layer to see what was going on and it had the same problem. I've messed with the feather and anti-aliasing but with no success. Anybody know what the deal is?

[Trevor.Dennis]

That's a strange one.  After making the initial selection, hit the Q key to go into Quickmask.  What do you see?  Does it have a hard edge, or is it feathered?

Do you have any layers clipped to other layers?

[rjh0016]

Hard edge, only one layer. The background layer (as well as background copy) has all of the visible stuff in it

[davescm]

Looking closely at the thumbnail for your second layer it looks like there is a section missing, which is being filled on the displayed image by the bottom layer

It looks to be the same shape as the area being missed in your lasso selection. You may want to switch the view to that layer only and check.

Dave

[Trevor.Dennis]

Yes those thumbs are definitely different, and there is a clear edge showing that follows the shape of the triangle — on its right side at least.

I was also wondering about the missing marching ants in the first screen shot, but I have a feeling this is a glitch with the way the screen shot was grabbed.

I hope rjh0016  comes back and tells what is going on, and doesn't discover the issue and go secret squirrel on us.

[gener7]

Whenever there is something going on with the marching ants, I suspect graphics card problems. But yes, we need details.

Go to Help > System Info, click on the Copy button, Paste (Cmd V) the info into your reply. It will save a lot of "back and forth" questions.

Gene

[rjh0016]

As requested, a wall of info haha. I reset photoshop to default preferences and still encountered the issue. I found a workaround for this particular scene not using the polygonal lasso but I'm still a little concerned about the problem.

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   Sumi-e 18.1.1, Copyright © 1991-2017 Adobe Systems Incorporated - from the file “Filter Gallery.plugin”

   Summation 18.1.1  ©2006-2017 Adobe Systems Incorporated - from the file “statistics.plugin”

   Targa 18.1.1, Copyright © 2003-2016 Adobe Systems Incorporated - from the file “Standard Multiplugin.plugin”

   Texturizer 18.1.1, Copyright © 1991-2017 Adobe Systems Incorporated - from the file “Filter Gallery.plugin”

   Tiles 18.1.1, Copyright © 2003-2016 Adobe Systems Incorporated - from the file “Standard Multiplugin.plugin”

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   U3D 18.1.1  ©2006-2017 Adobe Systems Incorporated - from the file “U3D.plugin”

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   Watercolor 18.1.1, Copyright © 1991-2017 Adobe Systems Incorporated - from the file “Filter Gallery.plugin”

   Wave 18.1.1, Copyright © 2003-2016 Adobe Systems Incorporated - from the file “Standard Multiplugin.plugin”

   Wavefront|OBJ 18.1.1  ©2006-2017 Adobe Systems Incorporated - from the file “U3D.plugin”

   Wind 18.1.1, Copyright © 2003-2016 Adobe Systems Incorporated - from the file “Standard Multiplugin.plugin”

   Wireless Bitmap 18.1.1  ©1989-2017 Adobe Systems Incorporated - from the file “WBMP.plugin”

   ZigZag 18.1.1, Copyright © 2003-2016 Adobe Systems Incorporated - from the file “Standard Multiplugin.plugin”

Optional and third party plug-ins: NONE

Duplicate and Disabled plug-ins: NONE

Plug-ins that failed to load: NONE

Extensions:

   com.adobe.inapp.purchase  2.10.56 - from the file “/Library/Application Support/Adobe/CEP/extensions/CC_LIBRARIES_PANEL_EXTENSION_2_10_56/purchase.html”

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Installed TWAIN devices: NONE

[gener7]

Thanks! That helps. You have a dual GPU system and you want to be sure the Mac is using the High Performance GPU.

Uncheck "Automatic Graphics Switching" in your Energy Saving Preferences. See this link if you need details:

Set graphics performance on MacBook Pro - Apple Support

Restart to be sure the change takes place. Then see if the problem is still there.

Also update CC 2017.1.1 to the latest 2017.1.2 to take advantage of any bugfixes. It might be what solves the problem.

Gene

[rjh0016]

Nope didn't discover the issue! Reset photoshop preferences, reselected the area multiple times, etc. No change. I found a workaround for what I needed not using the polygonal lasso but I'm still concerned about the underlying issue

[rjh0016]

Do I just realized what you were talking about. It's the exact same PSD file. Do you have any idea why the thumbnail might be different. I looked at the original image and the shadow is not in that shape.