Mastering Photographic Histograms: The key to fine-tuning exposure and better photo editing. by Al Judge

Author:Al Judge [Judge, Al]
Language: eng
Format: epub
Publisher: UNKNOWN
Published: 2016-10-31T00:00:00+00:00

The RGB Histogram on the right combines all the data from the three color channels to create a single histogram. The RGB Histogram can be very useful in post processing in a program like Photoshop. Most adjustment layers in Photoshop work by altering this histogram, so it is a valuable tool to be able to watch it change as you edit your image.

The Colors option in Photoshop displays the three Color Channel Histograms (Figure 24) in colors in one image so that you can see which color is contributing to each feature of the histogram. The shape of this histogram often looks like the RGB Histogram, but not always. The height of each Color Channel Histogram is determined by the highest bar in that particular color channel histogram. This can be misleading when the three histograms are combined to form the Colors Histogram.

With this option, the gray area is the overlap of all three Color Channel Histograms. The Blue indicates an area that is totally blue. The same is true for Red and Green. Where Red and Green overlap Yellow is displayed. Where Red and Blue overlap Magenta is displayed. Where Blue and Green overlap Cyan is displayed.

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