High Pass Filter

Russell Webb

• January 09, 2023 18:13

Quick question for version 2022.

How can I get to see this as I can in image from Affinity Photo? I use this to sharpen my images. Thank you, Russ.

 

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  David Tillett

  • January 09, 2023 18:27

  

  The Sharpen filter in Effects can use High Pass as one of its modes. 

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  Rick Sammartino Community moderator

  • January 09, 2023 19:05
  • Edited

  In the sharpening module in Develop, you hold down the ALT (or OPTION) key while adjusting to get this view. The sharpen filter in Effects doesn't have an option to do that.

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  Russell Webb

  • January 09, 2023 19:21

  Thankyou

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  David Tillett

  • January 09, 2023 23:38

  

  Rick, the Develop sharpening view is not quite the same as Russel's image. That is the result of applying the High Pass filter to a copy of the image to be sharpened. The actual sharpening comes by blending this with the original image using Soft Light or Overlay blend mode.
  
  There are other methods of sharpening such as Unsharp mask. Different methods suit different images and uses of final image.
  
  I can't find details of which technique Develop uses to do its sharpening, could be High Pass but also Unsharp Mask. Also it appears to be different in the Classic mode and when NoNoise is applied. In the latter holding down the Alt key only changes image to black and white, not the outline image as in classic. Then of course that sharpening is Global whereas the filter can be masked in to parts of image.
  
  There is a way to mimic the outline view when using the filter, set the blend mode to Difference and you get something similar to help judge the edges that are being created to be applied as sharpening, if eyeballing the result is not sufficient.

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