GridCoverageRenderer should avoid index color model expansion when a color map is present

Description

The geometric operations like scale and affine expand index color models when using higher order interpolations, however this causes colormap issues when dealing with a packed input, which is always assigned to a index color model, not matter what the meaning of the data is (anything below 8 bits does that).

Environment

None

Assignee

Andrea Aime

Reporter

Andrea Aime

Triage

None

Components

Fix versions

Priority

Medium
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