add a 1px border to a selection in a existing image

Question

Hey everbody,I'm working on this huge image, about 4608*3072 pixels, i want to add a tiny red(#FF0000) border(1px) to a selection, those are the steps i did: But doesn't work, photoshop draw also other pixels with a shade of red, there seem no obvious to cause something like this...and it's not the case of my objectiveI've been trying different tools to achieve that but haven't found a way yet. Does something like that exist? i need something like thisPS: the image size: 4608*3072, type : JPG

Barb Binder · Accepted Answer

That's anti-aliasing—Photoshop is softening the transition from the red to the background. If you zoom back to 100%, it probably looks just fine.

That said, with the marching ants selection active as in the first screen shot:

Window > Paths
Click Make Work Path from Selection button
Click to select the new Work Path
Pick Stroke Path from the panel menu
Change the Stroke Path tool to Pencil
OK

davescm · Answer

You are seeing the impact of anti-aliasing - which is there to prevent jagged lines.

To get a 1px wide line round your selection that is not anti-aliased:

Either make your selection with the pen tool (or convert your existing selection to a path)

Then with the pencil tool selected and set at one pixel wide - stroke the path (click on the symbol at the bottom of the paths panel)

Dave

Edit to add : Answers round here are like buses. You wait a while then several come at once - well done Barbara for getting in quicker and with screenshots !

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