LRGB on 庭 — a journal

HaLRGB workflow

Fri, 16 Oct 2026 00:00:00 +0000

Processing L, R, G, B and Ha exposures from a monochrome camera, from stacking to export. Ha strengthens the nebula in the red channel and in the luminance without distorting colours; RGB provides natural colours and star colours.

LRGBCombination

Fri, 16 Oct 2026 00:00:00 +0000

LRGBCombination combines a separate luminance with a colour image. The luminance provides brightness, structure and sharpness, the colour image provides colour. For the result to look neither pale nor oversaturated, the brightness of both images must match.

Matching luminance and colour image

Fri, 16 Oct 2026 00:00:00 +0000

Before a separate luminance is combined with a colour image, the brightness of both must match. The procedure measures at fixed spots, evaluates the pattern of deviations and adjusts the luminance with a curve.

Synthetic luminance

Fri, 16 Oct 2026 00:00:00 +0000

A synthetic luminance is built from existing channels instead of being captured with an L filter. It carries structure and sharpness; the colour image carries colour. Both are processed separately and merged with .