I created this: enter image description here

As you can see there is a fine line in this picture that is slightly darker than the rest (this will indicate the folding line in the end). I created it by making a rectangle with the Marquee Tool, then I clicked on Image > Adjustments > Exposure and then I set the Gamma Correction to 0.55.

I want exactly this line as a dotted line and at a very specific place (specific coordinates) and specific height.

I managed to get the height correctly by carefully drawing. I'm struggling with the specific coordinates, I tried changing the y coordinate in the Canvas property on the right, but that actually cut out the rectangle and pasted it at a different location, similar to the selection tool in paint.

Additionally, I don't know how to turn this rectangle into a dotted line.

How can I achieve this?

I also have Illustrator if that is easier.

Edit: What's important is that I can set the exposure of the line so that it "blends" in with the background

1 Answer 1


Just use the Pen Tool.

enter image description here

Click once to create a start anchor... hold the Shift key down and click again to create an end anchor. The Shift key will draw a straight 90° or 45° path (whichever is closer) between the anchors.

Draw a path and then set the options in the Control Bar...

enter image description here

You can adjust the stroke to many things...

enter image description here

enter image description here

You can then move this path to anywhere you need.

  • Thanks, I did this but then I cannot change the exposure, I don't want a simple dotted line, the dotted line is supposed to "blend" in with the background, sorry should have clarified that
    – Tom
    May 13, 2021 at 2:20
  • You can change the blending mode of the layer with the line... you can also position the layer, convert it to a smart object, then Command/Ctrl-click the layer thumbnail to load a selection for an adjustment layer.
    – Scott
    May 13, 2021 at 3:10
  • that worked, thanks !
    – Tom
    May 13, 2021 at 6:01

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