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Re: Color conversions [message #61241]

Thu, 10 July 2008 09:36

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

David Fanning wrote:
> MichaelT writes:
>
>> here is something I'd like to do and I do not know how, despite some
>> lengthy searches and trials:
>>
>> Say, I have displayed an image in a window and plotted some other
>> things on top. All that with a certain color table. Later, I want to
>> switch to a different color table and display the very content with
>> the new color table. I do not want to do all the displaying and
>> plotting, again. Just read the content of the window an display it
>> with another color table. So I tried something with TVRD - without any
>> success.
>> How would you do it? Is there a simple way?
>
> Not only is there no simple way, I think there is basically
> no way, unless you maybe are still using an 8-bit display.
>
> But, typically, people solve this problem by loading a new
> color table and re-displaying the graphic. :-)

And it should be easy, right? I mean you've encapsulated all your display code into a
routine, say "display_data" (right?), so all you have to do is

; default color table index
cidx = 0

repeat begin

; Load color table
loadct, cidx

; display data
display_data, mydata

; Get new colour table index
read, "New color table index [0-40] : ", cidx

endrep until (cidx lt 0 or cidx gt 40)

?

cheers,

paulv

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[Message index]

		Re: Color conversions By: Paul Van Delst[1] on Thu, 10 July 2008 09:36
		Re: Color conversions By: David Fanning on Thu, 10 July 2008 09:33
		Re: Color conversions By: MichaelT on Thu, 10 July 2008 09:27
		Re: Color conversions By: David Fanning on Thu, 10 July 2008 09:17

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