Re: True Color Image Manipulation

[davidf(at)dfanning.com (David Fanning)]

Don J Lindler (lindler@rockit.gsfc.nasa.gov) writes:

> Does anyone know a way to create a true color image using object graphics
> such that the three
> color planes can be manipulated independently (translation, scaling, and,
> rotation in 2 dimensions).
> In other words, I need each color (red, green, and blue images) in different
> IDLgrModel objects.
> 
> I was able to use IDLgrImage objects with the channel set ('ff0000'x for
> red, '00ff00'x for green,
> and '0000ff',x for blue).  These IDLgrImage objects were added to three
> separate
> model objects.  I was able to translate and scale each model separately but
> not rotate them.
> Rotation in 2 dimensions does not work properly for a IDLgrImage object.
> Also this approach
> has the problem that I need to supply all three color images to each
> IDLgrImage object even
> though I am only using one of them.
> 
> I contacted RSI support and they first suggested using an IDLgrPolygon
> object with the Texture
> maps set to the images.  This allows rotation in all three dimensions but
> did not work.  The channel
> property of the IDLgrImage was ignored when used as a texture map and it did
> not solve the
> problem of supplying three images to each IDLgrImage object.
> 
> I contacted RSI again and they suggested using a single IDLgrImage object
> and performing the
> image rotations manually with the ROT function and reloading the images into
> the IDLgrImage
> object with setproperty.  This works but was 50% slower than just using
> direct graphics instead
> of object graphics.
> 
> I would appreciate any suggestions or solutions.

I think you have pretty much covered the ground here.
But tell me again, what compelling reason do you have
to use object graphics in the first place?

Cheers,

David

-- 
David Fanning, Ph.D.
Fanning Software Consulting
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