Weird artifact in Photoshop I can't get rid of

[tsinsf]

I created an image in LR using Merge to HDR Panorama and spent a lot of time editing it after opening it in Photoshop. I just noticed this weird artifact in the upper left corner, which I have attached.
I can't get rid of it. It can't be painted over, cloned over using the clone stamp tool, or cropped out (it travels with the photo in it's reduced size). I've flattened the image, it is still there; I've copied the image and pasted into a new blank image, it's still there. I don't know if it was present when I started editing, or if something I did in processing created it. Anybody know what this is and how to remove it?

[digitaldog]

If you disable GPU in prefs does it still show?

[tsinsf]

Turning it off got rid of it. Thank you. This is weird, has happened once before. Hopefully it is a bug that will be corrected.  By the way, I went back to LR and reopened the original in PS and it was not there. Some action I did must have created it.

[digitaldog]

The bug is your GPU, you need to look into updating it's driver (Windows?).

[tsinsf]

I am on a Mac. I hadn't done the latest OS update, but I have now. Let's hope the problem doesn't come back. Thanks again for your help. I am curious, what was your clue in my story that it was the GPU?

[kirkt]

Assuming you are working in PS with the image - You enabled showing "Extras" and it includes displaying "Slices" - just disable all Extras (like grids, guides, etc.) by (de)selecting View > Extras OR, if you want to show Extras but not Slices, deselect Slices from the View > Show menu.

Enable your GPU in the prefs before testing this potential solution.  The default keyboard shortcut for Showing and Hiding Extras (CTRL-CMD-H) is very similar to hiding PS (CMD-H).  Maybe you accidentally enabled Extras when trying to hide PS.

Kirk

[kirkt]

Just to elaborate - that "artifact" is the slice ID displayed at the top left corner of each slice and overlaid on the image.  By default, an unsliced image has one slice - the entire image - hence the "01" that you see.

kirk

[fdisilvestro]

Just to elaborate - that "artifact" is the slice ID displayed at the top left corner of each slice and overlaid on the image.  By default, an unsliced image has one slice - the entire image - hence the "01" that you see.

kirk

That is exactly right!. It drove me crazy the first time it appeared (I must have hit a key inadvertently)

[tsinsf]

OP here. “Extras” was not enabled.

[digitaldog]

OP here. “Extras” was not enabled.

Right, nor would a GPU switch affect that.