Luminosity Blending Magic, 1

The past few posts examined several approaches to B&W conversion. A case was made for an approach that is based on image luminosity. These next several posts will explore luminosity further – not just as a means of B&W conversion.

A Simple Processing Step Based on Luminosity



Luminosity Blending (top – before)

Click to enlarge for details

Main Altar, Washington National Cathedral

From the viewpoint of a prostrate sinner 😉

This was done simply by –

  • Opening the original image in Photoshop
  • Adding a B&W version in the layer above the original
    • NOTE – not just any B&W
    • One converted using luminosity B&W conversion
    • TIP – The Silver Efex Pro default setting is a straight Luminosity B&W conversion.
    • Save a SEP default result and voila – Luminosity-based B&W
  • Changing the blending mode of the B&W layer to luminosity
  • Done in about a minute

You can used an image that’s been post-processed first. This example used the in-camera captured version.

If you enlarge the sample

  • You’ll see an amazing increase in detail
  • Please ignore the noise
    • This is one of the images from “Oops! The ISO is 1600, dummy!” shoot discussed here
    • (An interesting read if you have the time)

This is just one example of the use of luminosity in image processing. A powerful tool that doesn’t get the recognition it deserves.

Tomorrow – Part 2

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2 thoughts on “Luminosity Blending Magic, 1

  1. I enjoyed your comments on ISO and your recommendation on using the native
    ISO for your camera unless you have to adjust it to achieve a faster or
    slower shutter speed.

    I recently traded my Nikon D7000 for a Nikon *D72000*. I usually keep it
    as low as I can (200 for normal stuff, 100 for macro); I raise it when
    shooting in low light and cannot use a tripod (800, sometimes 1600 [at
    Luray Caverns]); use Nik dfine to help with noise afterwards before I post

    *How do I know what the “native” ISO is for the D7200?*

    • I’m guessing it’s 100, but don’t have the time to research it. It has to be cited somewhere.

      I’m waffling because my D800 E has a range of:
      ISO 100 -6400
      Lo-1 (ISO 50)
      Hi-1 (ISO 12,800)
      Hi-2 (ISO 25,600)
      Its “native ISO” is 100 even though its ISO can be set to 50.

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