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Stephen Johnson Tutorial: Contrast Without Saturation Change
(excerpt from the book Stephen Johnson on Digital Photography unreleased revised electronic version)
Using Adjustment Layers to edit photographs in Photoshop is a wonderfully freeing and powerful way of working in a non-destructive manner. My most common edits involve small contrast changes in a Curves Adjustment Layer. In color photographs, increasing the contrast will also likely lead to a perceptible increase in saturation when the Adjustment Layer is set for it's default Normal Blend Mode. This can create an unnatural level of saturation when only a contrast change is being sought. The default Blend Mode, normal is just that, the normal blend mode which edits all three grayscale channels making up the RGB file in a way that also pushes the contrast, even if such a side-effect is not desired. A simple change in the Blend Mode from Normal to Luminosity will eliminate this saturation change, imposing the curve as though the image was currently in the LAB mode where the grayscale brightness values can be edited separately from the color. |
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Additional Tutorials More Tutorials, Technical discussions and Essays are linked from the Techniques Button on our Home page. |
Photography Workshops Interested in learning more? Perhaps one of our digital photography classes would be of help? We take the imparting of information and the empowerment of our students quite seriously. The digital age has considerably enhanced our ability to teach, and we believe your ability to capture what you see. This program is designed to help you benefit from both of these advances. We hope you can join us on a workshop. Next Workshops: Color Management in a Day Photography Critique Session Highway One San Mateo Coast Joshua Tree National Park Guangxi China San Francisco Digitally Photoshop Straight and True RAW to Print: Summer Digital Bootcamp The Fine Art Print For a full list of current workshops, click here. |
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