| Re: HELP - Changing color map in Mac IDl [message #20179] |
Tue, 23 May 2000 00:00 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Liam E.Gumley (Liam.Gumley@ssec.wisc.edu) writes:
> 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, �No image argument was specified�
> END
>
> PRO XLOADCT24, IMAGE
> xloadct, updatecallback=�tvscl24�, updatecbdata=image
> END
>
> These wrappers will update the image whenever the color table is
> changed, e.g.
>
> image = dist(256)
> tvscl24, image
> xloadct24, image
As long as Liam brings it up, here is another plug for
my XCOLORS program, a program I like better than XLOADCT
for a number of reasons. Don't try this at home with XLOADCT
because it won't work. Ten bonus points to the person who
has been reading this newsgroup for less than a year who
can tell me why. :-)
Be sure you do this on a 16-bit or 24-bit display. Create
a small image display program. Something like this:
PRO DisplayIt, Image=image, Wid=wid
IF N_Elements(wid) NE 0 THEN WSet, wid
IF N_Elements(image) NE 0 THEN TVImage, image
END
Next, type these commands:
image = Dist(256)
Window, 0
LoadCT, 5
TVImage, image
XColors, Title='Window 0 Colors', Wid=0, Image=image, $
NotifyPro='DisplayIt', XOffset=50
Window, 1
LoadCT, 3
TVImage, image
XColors, Title='Window 1 Colors', Wid=1, Image=image, $
NotifyPro='DisplayIt', XOffset=250
Now you have two windows on the display and you can change
the colors independently in each one and the colors are
updated automatically. There is no limit to how many windows
and how many color table tools you can have open at once.
(Well, no *practical* limit.)
In addition to XColors, you will need my TVImage program
because, well..., because I always use TVImage instead of
TV. Doesn't make sense not to. :-)
http://www.dfanning.com/programs/xcolors.pro
http://www.dfanning.com/programs/tvimage.pro
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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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 |
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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, �No image argument was specified�
END
PRO XLOADCT24, IMAGE
xloadct, updatecallback=�tvscl24�, 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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| Re: HELP - Changing color map in Mac IDl [message #20182 is a reply to message #20179] |
Tue, 23 May 2000 00:00 |
davidf
Messages: 2866
Registered: September 1996
|
Senior Member |
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Mark Elliott (mark@mail.mmrrcc.upenn.edu) writes:
> 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.
>
> Is there a preference of some sort that will fix this?
What makes you think you are using 8-bit pseudo-color?
I would be willing to bet quite a lot of money your
graphics card doesn't think you are using 8-bit pseudo-color.
In fact, I'm convinced your graphics card thinks you are
using "thousands" or "millions" of colors. :-) Use your
Monitor Control Panel to select 256 color mode (or whatever
it's called there). Then re-start IDL.
Or, you could use a program like XWindow on my web page
to display your image and use the color changing tool from
that program. Those colors will update your image even on
a 16-bit or 24-bit display:
XWindow, 'TV', image, /XColors
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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