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Re: HELP - Changing color map in Mac IDl [message #20181 is a reply to message #20179]

Tue, 23 May 2000 00:00

Liam E. Gumley
Messages: 378
Registered: January 2000

Senior Member

Mark Elliott wrote:
> I am running IDL 5.3 on a G4 Mac. I'm using 8-bit pseudo-color.
> When I change the LUT (like with loadct) the images in the graphics
> windows do not change their appearance unless I redraw them. This
> makes routines like xloadct practically useless for optimizing the
> color map levels.

Assuming you are actually running in 8-bit mode (is your desktop set to
256 colors?), then you are seeing a 'feature' of the IDL direct graphics
system. There is no IDL preference which affects this behavior.

However consider the following wrappers for TVSCL and XLOADCT in IDL
5.3:

PRO TVSCL24, IMAGE, DATA=DATA
if (n_elements(image) gt 0) then begin
tvscl, image
return
endif
if (n_elements(data) gt 0) then begin
tvscl, data
return
endif
message, ï¿½No image argument was specifiedï¿½
END

PRO XLOADCT24, IMAGE
xloadct, updatecallback=ï¿½tvscl24ï¿½, updatecbdata=image
END

These wrappers will update the image whenever the color table is
changed, e.g.

image = dist(256)
tvscl24, image
xloadct24, image

Cheers,
Liam.
http://cimss.ssec.wisc.edu/~gumley

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[Message index]

		Re: HELP - Changing color map in Mac IDl By: davidf on Tue, 23 May 2000 00:00
		Re: HELP - Changing color map in Mac IDl By: Liam E. Gumley on Tue, 23 May 2000 00:00
		Re: HELP - Changing color map in Mac IDl By: davidf on Tue, 23 May 2000 00:00

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