A histogram is a representation of pixel data across the range of tones in a picture.
Its limits are defined by the Whites & Blacks.^[Adobe Photoshop Lightroom Classic Classroom in a Book® (2023 release)#^236158]
This is extremely oversimplified, but think of a histogram as kind of a chart. On the left side of the histogram are pixels of 0% luminance. On the right are pixels of 100% luminance. The white area is showing you color values from 0 to 255, each of them from darkest to lightest.^[Adobe Photoshop Lightroom Classic Classroom in a Book® (2023 release)#^aecd04]
Status:: #wiki/notes/mature
Plantations:: Photography
References:: Adobe Photoshop Lightroom Classic Classroom in a Book (2023 release) - 0137983395