Advanced pixel blending
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Table of Contents
Excerpted from “Real World Adobe Photoshop CS2” by Bruce Fraser and David Blatner
Blending pixel layers in Adobe® Photoshop® CS2 lets you do things that you simply can’t do by adjusting a single image. One situation where we blend pixel layers is when we want to extend the apparent dynamic range of digital captures. Of course, the best way to do this is to take several bracketed exposures and merge them to a 32-bit floating point HDR (High Dynamic Range) image. But that requires planning, a hefty tripod, and a subject that moves little if at all.
It may seem that it’s pointless to blend different renderings of a single digital capture. After all, all the data is in the capture, so why not simply edit it to get the results you want? We feel that there are two reasons:
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It’s extremely difficult to get everything right from a single rendering of the image.
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Most cameras capture 12 bits of data. By blending multiple renderings of the 12-bit capture, you can populate more levels in 16-bit space than you can by stretching and squeezing the original 12 bits.
The image below shows an “impossible” image produced just this way.
The sun is just outside the frame at the top of the image—we wouldn’t even have attempted this with film!
We chose this completely over-the-top example to make it clear just how far you can take this approach, but the techniques are equally applicable to interior shots with bright window light, or to any other kind of wide-dynamic-range scene.
We started by creating three different renderings of the same camera raw image, one for highlights, one for midtones, one for shadows, using the Camera Raw plug-in.
The image, rendered for shadows from Camera Raw.
The Camera Raw settings and the Curve tab with the image rendered for shadows.
The image, rendered for midtones from Camera Raw.
The Camera Raw settings and the Curve tab with the image rendered for midtones.
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