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Re: ENVI: how to avoid stretching in image displays? [message #40511 is a reply to message #40478]

Mon, 16 August 2004 08:49

adam_e_oconnor
Messages: 2
Registered: August 2003

Junior Member

ENVI's default stretch is 2% Linear, which explains the observed
behavior. You can view this setting by selecting "File > Preferences"
from the main ENVI menu and selecting the "Display Defaults" tab. If
you want to permanently turn off ENVI's automatic stretching you
actually should select "Linear Range" and enter "0" in the minimum box
on the left and "255" in the maximum box on the right. That way byte
values ranging from 0 --> 104 are actually displayed as 0 --> 104.
Simply changing the "% Linear" setting to "0.0" will eliminate the 2%
saturation, but there is still a linear stretch applied such that 0
--> 104 will be displayed as 0 --> 255, which is not what you want in
this case. You can confirm that your data values are being accurately
displayed by using the "Tools > Cursor Location/Value..." utility from
the menu system within any display window. The "Scrn: R: G: B:"
values should match the "Data:" value. Keep in mind that after you
make changes to the Preferences you must re-display any images that
are already open in order for the changes to take effect.

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[Message index]

		ENVI: how to avoid stretching in image displays? By: wl2776 on Mon, 09 August 2004 12:03
		Re: ENVI: how to avoid stretching in image displays? By: wl2776 on Tue, 10 August 2004 10:42
		Re: ENVI: how to avoid stretching in image displays? By: adam_e_oconnor on Mon, 16 August 2004 08:49
		Re: ENVI: how to avoid stretching in image displays? By: tianyf on Tue, 10 August 2004 01:25

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