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It’s toning time again. Toning is done do black and white images to increase their “volume”, the perceived contrast range. We only have 256 values on the screen, so a bit of colour can be good.
In #39 I had shown how to make a Duotone or Tritone out of a monochrome image. And then Paul Wellner Bou showed in his Blog an easier way to do this.
It’s working, but why? To answer that, I look into the HSV colour model and try to explain the effects of the different layer modes.
A little bit about sharpening in an extra layer with “value” as the mode and a pointer to faking analog camera frames in digital images with a script and an original Hasselblad frame made by Marcus Ranum are at the end of the episode.
The TOC
01:00 Toning images
02:00 Toning enhances the visual volume
03:50 The recipe for a duotone
04:30 Adding a layer in colour mode and adding a layer mask from an image copy
07:00 Doing the same for the second tone
08:00 Inverting the mask
09:20 Switching layers on and off
10:30 Sharpening in Value mode
12:20 Unsharp mask
15:10 Explanation of Colour and Value mode
17:10 HSV colour model
20:00 A fake view camera frame
22:20 Multiply mode
23:40 A real Hasselblad frame
Meet the GIMP Video Podcast by Rolf Steinort and Philippe Demartin is licensed under a Creative Commons Attribution-Share Alike 3.0 Germany License.
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