This uses the channel-mixed grayscale image as a virtual L channel. To enhance a color image, the Channel Mixer may be used in Luminance mode (the light source icon). After the edits are finished, converting to 8-bit for display has little effect it is the pushing and pulling on the color numbers during editing that requires 16-bit.)Ģ. (Note that extreme edits have exceeded the limits of our compressed 8-bit JPEG image, resulting in banding in the sky and other artifacts this is why we edit in 16-bit and a wide gamut if at all possible. Note that the numbers can be negative subtracting the blue channel and raising the others can produce hyper-real dark sky, light foliage effects. Mixing in the green channel tones down the effect, more like a yellow filter. Fix to 100% preserves the sum of all the channels (there is no law that says you have to do this).įor example, the red channel looks like a b/w photograph taken with a red filter, with dark skies and foliage. Set green or blue to 100% and the others to 0% to see the other channels. By default, you are looking at the red channel. For b/w conversion, use Gray Image mode (the gray gradient icon). It can be used in three different modes:ġ. Apply it via Layer – New Adjustment Layer – Channel Mixer.
It lets you mix different proportions of the image’s channels and display the result in either b/w or color. It is usually thought of as a way to convert a color image to b/w, but it has other subtle uses. Or to preserve the original RGB image untouched, acquire the L channel from a copy of the image (Edit – Merged Copy Edit – Paste as Document). The image does not have to remain in Lab mode you can go to the Layers panel and convert it back to RGB. Clicking the Channel to Layer button at the bottom of the panel creates a new grayscale layer that is a copy of the L channel. Now on the channels panel, select the L channel. the background layer) to Lab via Layer – Convert Layer Type – Lab Image or on the Layer properties panel, select Type: Lab.
An image’s channels are based on the background layer. Use Layer – Convert Layer Type – Gray Image, or on the Layer properties panel, select Type: Gray.Ī slightly better way is to use the L channel. It is quick and easy but the result is seldom spectacular. The brute force way to convert a color image to black-and-white is to change its mode to grayscale. An Introduction to Photo Editing with PhotoLine: Black/White Conversion, Channel Mixing, and Toning
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