Using the Channel Mixer adjustment, you can create high-quality grayscale, sepia tone, or other tinted images. You can also make creative color adjustments to an image. To create high-quality grayscale images, choose the percentage for each color channel in the Channel Mixer adjustment. To convert a color image to grayscale and add tinting to the image, use the Black & White command (see Convert a color image to black and white).
The Channel Mixer adjustment options modify a targeted (output) color channel using a mix of the existing (source) color channels in the image. Color channels are grayscale images representing the tonal values of the color components in an image (RGB or CMYK). When you use the Channel Mixer, you are adding or subtracting grayscale data from a source channel to the targeted channel. You are not adding or subtracting colors to a specific color component as you do with the Selective Color adjustment.
Channel Mixer presets are available from the Preset menu in the Properties panel. Use the default Channel Mixer presets to create, save, and load custom presets.
Click the Channel Mixer icon in the Adjustments panel.
Choose Layer > New Adjustment Layer > Channel Mixer. Click OK in the New Layer dialog box.
You can also choose Image > Adjustments > Channel Mixer. But keep in mind that this method makes direct adjustments to the image layer and discards image information.
In the Properties panel, choose a channel from the Output Channel menu in which to blend one or more existing channels.
In the Properties panel, choose a Channel Mixer preset from the Preset menu.
To decrease the channel’s contribution to the output channel, drag a source channel slider to the left. To increase the channel’s contribution, drag a source channel slider to the right or enter a value between ‑200% and +200% in the box. Using a negative value inverts the source channel before adding it to the output channel.
This option adjusts the grayscale value of the output channel. Negative values add more black, and positive values add more white. A ‑200% value makes the output channel black, and a +200% value makes the output channel white.
Monochrome images display color channels as gray values. Adjust the percentage of each source channel to fine-tune the overall grayscale image.
Select one of the default presets from the Channel Mixer menu:
Black & White Infrared (RGB)
Red=‑70%, Green=200%, Blue=‑30%
Black & White With Blue Filter (RGB)
Red=0%, Green=0%, Blue=100%
Black & White With Green Filter (RGB)
Red=0%, Green=100%, Blue=0%
Black & White With Orange Filter (RGB)
Red=50%, Green=50%, Blue=0%
Black & White With Red Filter (RGB)
Red=100%, Green=0%, Blue=0%
Black & White With Yellow Filter (RGB)
Red=34%, Green=66%, Blue=0%
To control the amount of detail and contrast in the images before you convert them to grayscale, use the source channel sliders.
Before adjusting the percentages of the source channels, view how each source channel affects the monochrome image. For example, in RGB, view the image with the Red channel set to +100% and the Green and Blue source channels set to 0%. Then, view the image with the Green source channel set to +100% and the other two channels set to 0%. Finally, view the image with Blue source channel set to +100% and the other channels set to 0%.
The Total value displays the total percentage of the source channels. For best results, adjust the source channels so the combined values equal 100%. If the combined values are above 100%, a warning icon appears next to the total, indicating that the processed image will be brighter than the original, possibly removing highlight detail.