Hello Simone
I would like to know if you have some more hints about your plan for
IndexColorModel support? I'm asking that because actually, IndexColorModel is
already supported (in some way) for at least 2 years, and I would like to agree
on what may be the beast approach for that.
What I would like is: *never* convert an index color model to RGB without
explicit user request (the "user" may be the grid coverage renderer). If
interpolations are required on an indexed image, either:
- do the interpolation in the "geophysics" space if such space is available;
- otherwise do not allow anything else than "nearest neighboard" interpolation.
This exactly what the existing coverage module does for all operations except
the new ones (Scale, Crop, FilteredSubsample, SubsampleAverage). If you give me
the authorization, I would like to refactor those operations in order to make
them behave like the other operations.
The rational is that the coverage module is primarily about data that happen to
be displayable. If the image contains meteorological or oceanographical data
for
example, then performing anything like "Scale" on the RGB values is dangerous
as
explained in my previous email. Furthermore, interpolating on RGB will produce
the wrong colors anyway (if an image is about temperature, we need to convert
to
geophysics space, interpolate the temperature, convert back to indexed space
and
then display according the IndexColorModel - the result is different than
interpolating the RGB values.)
I suggest that we provide some convenience method that converts an arbitrary
GridCoverage2D from indexed space to RGB space, so the user can invoke this
method before to apply operations if he want to operate on RGB space. But
otherwise, I would like to push for a "never convert to RGB under the hood in
coverage module" policy. Would you agree?
Martin
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