| Re: Color problem on Mac, not Windows - something about 239? [message #17673] |
Wed, 03 November 1999 00:00 |
Struan Gray
Messages: 178
Registered: December 1995
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Senior Member |
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David Hirsch, dhirsch.IHATESPAM@mail.utexas.edu writes:
[problems with colour tables on MacOS]
I get the same thing on a PPC9600/OS8.6/IDL5.2.1. I don't know
where it is coming from, but it looks like the Mac window manager
isn't giving IDL what it wants. There's a similar problem in direct
graphics where the first and last items of a 256-element colour table
are always black and white on screen, whatever IDL might think they
are internally. The online help for IDLgrWindow does warn that
256-colour windows might behave strangely.
The solution to your problem is to make the window an RGB one
(color_model=0) and associate the palette with the IDLgrImage.
Conceptually this makes more sense anyway - and it will allow you to
add annotations to images in colours no contained in the image's
colour table, useful for colour overlays on B+W images. In your
example program just replace:
myWindow->SetPropery, palette=myPalette
with:
myImage -> SetProperty, palette=myPalette
everywhere it occurs and everything works fine. (You'll also have
to move the creation of myImage so it occurs before the palette
allocation)
Struan
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