Colour map limited to 256 colours

[martyngigg]

This issue was originally TRAC 4060

Rob Dalgliesh would like to be able to read in a colour map of higher resolution than 256 colours but the code currently only handles a maximum of 256 colours.

[martyngigg]

@NickDraper (2011-11-17T14:44:52):
How possible is this?

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@NickDraper (2012-01-09T09:43:14):
Moved to iteration 33 at iteration 32 code freeze

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@NickDraper (2012-04-30T14:12:30):
Moved at end of release 2.1

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@NickDraper (2012-08-10T12:43:31):
Moved at the end of release 2.2

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@NickDraper (2012-10-28T11:38:44):
Moved to milestone 2.4

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@NickDraper (2013-01-28T09:22:58):
Moved at the code freeze for release 2.4

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@NickDraper (2013-04-29T09:49:36):
Moved to r2.6 at the end of r2.5

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@NickDraper (2013-07-26T13:54:58):
Moved to backlog at the code freeze for R2.6

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@NickDraper (2014-02-14T11:04:55):
Bulk move to assigned at the introduction of the triage step

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