Cades Cove, Great Smoky Mountain NP
Misty Dawn Scene
This technique produces what I call a “luminosity” B&W.
- It can be done with any editing program that uses layers and has a Luminosity blending mode. The method (using Photoshop Elements) is shown in the following screen shot:
- Make a copy of the original image
- Place a white layer beneath it
- Change the blending mode of the copy to Luminosity
- You’re done
The result derives from how Luminosity blending works.
- Luminosity takes its hue & saturation values from the 2nd layer (the white layer below the luminosity blend layer) and its luminosity values from the top layer.
- Since the 2nd layer’s H & S value are zero (neutral) the result, as shown on the left, is pure black and white (gray tones) whose lightness values match those of the original image.
- Voila – we’ve extracted the luminance channel.
For the 4th & final time, here’s the comparison of all three conversion techniques
It’s unfortunate that image editing software programs offer desaturation and grayscale, but not luminosity – unfortunate because, of the three, it’s the best. There is an easy way to make a luminosity-based B&W without going through the PS routine described above. Tune in tomorrow,
Tomorrow – Luminosity Tips