How to use a color checker.
The sole focus of calibration is to adjust captured or displayed color so that it aligns with a known, measurable value. So that we are all on the same page, let’s start with some foundational concepts. An 8-bit RGB system has 256 shades for each of the Red, Green, and Blue channels. Because 0 is an integer, it counts as one of the 256 shades. In a system where black is 0, this means that the color red is expressed as 255,0,0 in decimal code.
The camera has captured the image with too much green and to return it to the correct value, we must remove the green tint. That said, the reality is that the final stage of viewing is a total toss-up. Some viewers might use an iPhone, some might use Android. Some might use a MacBook Pro, some might be using a Walmart Black Friday laptop special. There is no real way to predict the hardware an image may be viewed on, and that places us in a difficult position.
Beyond the color calibration component, the color checker also provides dedicated squares for white balance. As I have mentioned before, I love automation and batch edits. Having a reliable white balance measurement for differing lighting scenarios is incredibly helpful for larger edits.My color checker lives in my camera bag so that it is always available for me to use while out working.
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