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"Channel Mixer" is great a great new image adjustment tool that allows the user to mix/blend the colour channel balance of an image. In fact so powerful is this new tool that you can easily replicate the effect of placing red or yellow filters over the lens when using black and white film.
The starting point will always be a full colour image in RGB mode.
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"Channel Mixer" Adjustment
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To convert colour image to black and white using "Channel Mixer"
Image > Mode > Grayscale
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Open picture file in Photoshop
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Create a Channel Mixer - adjustment layer.
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Creating a adjustment layer
over the original picture
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By selecting the "Monochrome" checkbox we are instructing Photoshop to convert the full colour RGB image into a monochrome preview, but the image still retains all the colour channel information. Note that in the screenshot of the "Channel Mixer" dialog that the "Output Channel" is Gray; we cannot change it. However, even though the red channel is initially at 100% and the green and yellow channels are at 0% we are free to mix them as we see fit. The objective is to optimise the image whilst ensuring that total percentage for the three channels adds up to 100% or as near as is possible. Interestingly combinations adding up to more or less than 100% will be either darker or lighter than the original colour image. So don't be afraid to experiment!
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Check on "Monochrome
- Drag the RGB-sliders for adjustment
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Above is the default setting of Channel Mixer
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Once satisfy with the adjustment covert the RGB image to Grayscale. Flatten the layers before choosing 'mode' > "grayscale"
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