Here's the photo I'm using throughout this series so we can compare the results of the different black and white conversion methods:. Before we start mixing the three RGB color channels together, it helps to first see what each channel looks like so we have some idea of what we're working with. We covered how to view each channel separately in the document window in the previous tutorial so I won't bother repeating it here, but as a quick reminder, here's what each of my three channels look like, with the Red channel on the left, the Green channel in the middle and the Blue channel on the right.
As we can see, the Red channel gives us the lightest image since skin tone always contains lots of red, while the Blue channel gives us a very dark image because there's very little blue in the photo:. Now that we've seen what it is we'll be mixing together, let's add our Channel Mixer.
In a moment, we'll use the Channel Mixer to mix our three color channels together, but before we do, since we're using the Channel Mixer to create a black and white version of the image, select the Monochrome option. This will convert the image to black and white in the document window, and if you look at the Output Channel option in the Channel Mixer dialog box, you'll see that we're now creating a custom Gray channel depending on which version of Photoshop you're using, the Monochrome option may be located near the bottom of the Channel Mixer dialog box rather than at the top as it appears in the screenshot :.
In the center of the Channel Mixer are the controls that allow us to adjust how much of each channel is being used to create the black and white version we see in the document window. The reason why the Red and Green channels are given preference over the Blue channel is because of how our eyes work, with reds and greens being easier for us to see than blues.
Here's what my image looks like with the default values:. But why not use it for fun too, such as changing the color completely! Before you start, however, there is one vital thing you must know, if you want to work in Photoshop in a non-destructive way: layers and masks. The examples below are from a photoshoot I did with my girls. The first thing you need to do once your file is opened, is to select the area where you want the color changed using either the quick mask mode, or one of the lasso tools.
While your selection is highlighted, add a channel mixer adjustment layer and your selection will automatically be added as a layer mask. Click on the channel mixer icon to the left of the layer itself and a window pops-up. There are three values under the output channel: Red, Green, and Blue. You need to bring up each value and move the sliders until you get your desired color.
This article is part of our series Photo Editing by Ian Pullen. This series will cover all of the basics of using Photoshop for editing photos.
You can also find the articles that have already been published by visiting the Photo Editing course page. The Channel Mixer adjustment layer in Photoshop can be used to apply creative color effects to your images, convert them to black and white, and add color tints to mono images.
If the Adjustments palette is open, then you just need to click the icon at the right hand side of the middle row of icons, represented by three overlapping circles.
In the Properties panel, choose a Channel Mixer preset from the Preset menu. Using a negative value inverts the source channel before adding it to the output channel. Drag the slider or enter a value for the Constant option. Apply a Channel Mixer adjustment. In the Properties panel, do one of the following:.
Select Monochrome. To control the amount of detail and contrast in the images before you convert them to grayscale, use the source channel sliders. Optional Drag the slider or enter a value for the Constant option. Create a hand-tinted appearance for specific image elements. In the Properties panel, select and then deselect Monochrome. Choose an Output Channel option, and adjust the source channel sliders.
Repeat this step as desired for each output channel.
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