eightbitperchannel

Eightbitperchannel refers to a color encoding scheme in digital imaging where each color channel, typically red, green, and blue in the RGB color model, uses eight bits of information. This yields 256 distinct levels per channel and 16,777,216 possible colors per pixel (256^3), commonly described as 24-bit color or true color for standard RGB images. Some pipelines also include an alpha channel for transparency, which would add eight bits per channel, resulting in 32 bits per pixel in RGBA configurations.

In practice, eightbitperchannel is widely supported by image formats and displays. JPEG and PNG images commonly store color data at eight bits per channel, though PNG can also use 16 bits per channel. Most computer displays and color management pipelines assume eight-bit-per-channel input, with sRGB or similar gamma-corrected color spaces to ensure consistency across devices.

Advantages include compact storage compared to higher bit depths and broad software compatibility, as well as sufficient color fidelity for many applications such as web graphics and standard photography. Limitations include limited tonal precision and the potential for banding in smooth gradients, especially in low-light regions or after heavy editing. Converting higher dynamic range or 12- or 16-bit images down to eight-bit per channel can cause clipping if not managed properly.

History and usage: eightbitperchannel color became the de facto standard in consumer imaging during the late 20th century, aligning with common display technologies and storage media.

See also: color depth, RGB color model, true color, gamma correction, sRGB, eight-bit image formats.