One photograph, one global adjustment

The centre is the exact original. The left endpoint is fitted to sampled colours in a product photograph. The right treats the original lighter fabric as a neutral reference and raises exposure.

Reference white · x, y

Relative exposure

Tone-curve exponent

White balance has two colour coordinates; Kelvin alone is insufficient here. These are adjustments to a processed JPEG, not estimates of its original camera settings. A common tone curve preserves texture while changing contrast; highlights may clip. The same correction applies to every selected pixel. The optional beach has ambient illumination only.

Development checks