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I wanted to enhance dark lines in an architectural image, so needed a layer with only outlines and otherwise transparent. Here's what I did.

  • Duplicate background
  • Detect edges
  • Adjustment layer: Black/white, Merge
  • Layer/Invert
  • Adjustment layer: Levels black 50%, Merge
  • Filters/Colours/Erase White Paper
  • Opacity to suit.

(Yes, I could Blend Mode: Darken rather than erase white paper, but having just the lines gives a bit more flexibility).

 

Is there a better way?


Dave Straker

Cameras: Sony A7R2, RX100V

Computers: Win10: Chillblast Photo with i7-3770 + 16Gb RAM + Philips 40in 4K; Surface Pro 4 i5

Favourite word: Aha. For me and for others.

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Thanks, MBd!

 

I'm still a beginner, really. Happy to share experiments but not be authoritative.

 

I'll have a go with curves. I did try blend ranges with no improvement in the images with which I used this, but it is indeed a powerful option. I tried Gaussian blur but not min/max/others - I'll experiment with these.


Dave Straker

Cameras: Sony A7R2, RX100V

Computers: Win10: Chillblast Photo with i7-3770 + 16Gb RAM + Philips 40in 4K; Surface Pro 4 i5

Favourite word: Aha. For me and for others.

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Interesting principle about priors. And the general notion of how to know which are the "right" edges. Like if you divided the image into little squares, then isolated those with the widest lines running through them. Or only chose lines of greater length or width.

 

Hmm.


Dave Straker

Cameras: Sony A7R2, RX100V

Computers: Win10: Chillblast Photo with i7-3770 + 16Gb RAM + Philips 40in 4K; Surface Pro 4 i5

Favourite word: Aha. For me and for others.

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you can use the Gaussian or Motion blur effects to blend two photos together. Or, you can simplyerase the parts/edges of the photo with the Eraser Tool using a soft brush.

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I wanted to enhance dark lines in an architectural image, so needed a layer with only outlines and otherwise transparent. Here's what I did.

  • Duplicate background
  • Detect edges
  • Adjustment layer: Black/white, Merge
  • Layer/Invert
  • Adjustment layer: Levels black 50%, Merge
  • Filters/Colours/Erase White Paper
  • Opacity to suit.

(Yes, I could Blend Mode: Darken rather than erase white paper, but having just the lines gives a bit more flexibility).

 

Is there a better way?

 

Another option to play with, a little less destructive.

After Black/White, Merge try this:

 

  • Channels, pick anything, R, G, or B, right click then Create Mask Layer
  • Duplicate the background layer with the architecture
  • Add the mask layer to the duplicated background
  • Nest a curve adjustment to the duplicated background
  • Tweak the curve

For instance, you can tweak contrast and color with just the curve.

You can also add a second curve to fine tune the mask with the edge previously detected (an RGB curve, then pick Alpha from the drop-down menu).

By doing so, you don't need to commit any step of your work and you can keep editing.


Andrew
-
Win10 x64 AMD Threadripper 1950x, 64GB, 512GB M.2 PCIe NVMe SSD + 2TB, dual GTX 1080ti
Dual Monitor Dell Ultra HD 4k P2715Q 27-Inch

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