Graphics Programs Reference
In-Depth Information
III. Advanced Conversion Techniques
Channel Mixer
Utilizing these founding color principles, the channel mixer puts theory into
action. With the same ef ect color i lters produced, you can dynamically
interact with the translation of the spectral relationships between colors in
the conversion process by mixing the individual channels within a document.
The Channel Mixer tool allows you to control how much each of the three
color channels (Red, Green and Blue) contributes to the i nal grayscale
brightness. This method, therefore, has the ability to act as a digital set of
black and white i lters, all in a single interface allowing you the l exibility and
power of having the whole color i lter pack in post production.
The channel mixer has been traditionally and undoubtedly one of the most
powerful black and white conversion methods; however, it may take some
time to master since there are many parameters which require simultaneous
adjustment.
There are many ways to mix the channels in this process, and the “right” mix will
vary on a per image basis. Photoshop CS4 provides a few great presets to start
with (in fact you can save your own) but it is important to play with the mix
until you i nd a pleasing ef ect.
 
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