Expressing a single channel selection, out of red, green and blue, returns a gray image

Description

QGIS instead renders the image as RGB, picking the chosen channel and leaving the others to zero.
In SLD that situation is not clearly defined, but better to have the same behavior, if one wants gray, there is already the gray channel selection.

Environment

None

Status

Assignee

Andrea Aime

Reporter

Andrea Aime

Triage

None

Components

Fix versions

Priority

Medium
Configure