• Photoshop > Menu > image >


  • Calculations uses two Channels to make a more refined selection, which can be output as a new Channel or a selection.
  • Source 1 layer can be imagined as actually being on top of the Source 2 layer.
  • Opacity determined the opacity of the top layer, so by setting it to zero the bottom layer is revealed.
  • Blending modes Add and Subtract are only available in Calculations, and the Offset and Scale are only visible when these options are selected.
  • Offset goes from -255 to +255 and is the amount of lightening or darkening applied to the result.
  • Scale can be between 1 and 2.
  • Clicking on Mask reveals the panel below it.


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