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Part 4. Working with Tone > Task 1 How to Measure and Compare Pixel Values

Task 1 How to Measure and Compare Pixel Values

Knowing how to accurately measure pixel values is an important first step in being able to evaluate and correct digital images. Many times, you have to determine the tonal value of an image area or compare the value of two different areas. It is important to measure these values numerically because pixel values change from monitor to monitor based on contrast settings, ambient light, and monitor brands. Photoshop uses the Info palette to measure pixel values; the Eyedropper and Color Sampler tools also are helpful aids.

1. Open the Info Palette

With the image open, select Window, Info. The Info palette opens on the desktop.


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