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Re: zoom at widgets [message #92359 is a reply to message #92358]

Sat, 28 November 2015 15:37

Helder Marchetto
Messages: 520
Registered: November 2011

Senior Member

On Saturday, November 28, 2015 at 6:30:04 PM UTC, skymaxwell wrote:
> i did some changes. It's works
>
> IF ((*pState).imageLoaded NE 0) THEN BEGIN
> data=*(*pState).pImage
> zoom_data=data[x-4:x+4,y-4:y+4]
> help,zoom_data
> WIDGET_CONTROL,(*pState).draw,GET_VALUE=id
> WSET,id
> zoom_data=REBIN(zoom_data,360,360,/SAMPLE)
> WIDGET_CONTROL,(*pstate).zoom,GET_VALUE=id
> WSET,id
> TVSCL,zoom_data
> ENDIF
> ENDIF
>
> but zoomed images still not like original. Zoomed image pixels are changing own intensivity. Why ?

Hi,
the intensities you display are adapted (rescaled) between 0 and 255 using the tvscl command. In other words, what tvscl does is this:
tv, bytscl(zoom_data)

If you want the scaling to be the same in the two images, you have to find out what scaling you have in the first image and apply this to the zoomed image.
See http://www.exelisvis.com/docs/BYTSCL.html for more information.

If you don't use any scaling in the fist image (that means you simply use tvscl), then you can substitute your tvscl command in the zoom data display with this:
mn=min(data, max=mx)
tv, bytscl(zoom_data, max=mx, min=mn)

I hope it helps.

Cheers,
Helder

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[Message index]

		zoom at widgets By: skymaxwell@gmail.com on Sat, 28 November 2015 05:43
		Re: zoom at widgets By: skymaxwell@gmail.com on Sat, 28 November 2015 10:29
		Re: zoom at widgets By: Helder Marchetto on Sat, 28 November 2015 15:37
		Re: zoom at widgets By: skymaxwell@gmail.com on Tue, 01 December 2015 01:26
		Re: zoom at widgets By: skymaxwell@gmail.com on Wed, 02 December 2015 07:57

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