Image EditingLesson 204Free preview

Grayscale Image

This lesson is part of Web Developer Tools · All levels

Summary

The grayscale converts a colored image to a grayish hue by maintaining a brightness level. Conversions typically use different weights for red, green, and blue because the human eye is more sensitive to green. The result is not just black and white images: there are still many gray gradations between them.

Key points

The grayscale stores colorless luminance information
The weight of the canals is different because the eye's perception is not the same for each color.
The grayscale still has many gray levels, different from the black-and-white threshold
Alpha channel can still be maintained on PNG
The grayscale mode often reduces file size

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