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Re: display gray image with NaN [message #94243 is a reply to message #94240]

Sat, 04 March 2017 02:02

Nikola
Messages: 53
Registered: November 2009

Member

On Friday, March 3, 2017 at 1:55:26 PM UTC, dashtab...@gmail.com wrote:
> Hello everybody
>
> i have a gray scale image (one band with NaN value) and display it with image() and widget_window().
> i want to show specific values (maybe gt 1000 pixels ) over image with red color.
> like this. http://pasteboard.co/EYXxQWAAW.jpg
>
> Thank you for your help.
> Regards

It is not that trivial. What I normally do is to rescale all the non-NaN values in dataset to the range [0, 254] and assign 255 for the NaN's pixels. Then I make colorscale that has the grey tones between 0 and 254 and red in 255:
r = [FINDGEN(255), 255]
g = [FINDGEN(255), 0]
b = [FINDGEN(255), 0]

This should do the trick.

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[Message index]

		display gray image with NaN By: dashtabadi.m.r on Fri, 03 March 2017 05:55
		Re: display gray image with NaN By: jpleahy2 on Sat, 04 March 2017 02:00
		Re: display gray image with NaN By: Markus Schmassmann on Mon, 06 March 2017 02:02
		Re: display gray image with NaN By: Nikola on Sat, 04 March 2017 02:02

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