[Qgis-user] Colour ramps - raster file extreme values

[b.j.kobben at utwente.nl]

My bad, I think I confuse it with another software or with a plugin. I have very limited internet access at the moment so cantt look into it fro you, sorry...

Barend

On 24-08-15 07:51, "Lester Anderson" <arctica1963 at gmail.com<mailto:arctica1963 at gmail.com>> wrote:

Hello,

There is no histogram stretch option with v2.6 - is this a new option in the later versions?

Lester

On 22 August 2015 at 18:19, <b.j.kobben at utwente.nl<mailto:b.j.kobben at utwente.nl>> wrote:
Look into "histogram stretch", this stretches colour values based on frequency.

Barend

--
Barend Köbben
Senior Lecturer - ITC-University of Twente
PO Box 217, 7500 AE Enschede (Netherlands)
@barendkobben
http://www.itc.nl/geoinformatics



On 21-08-15 17:48, "Lester Anderson" <arctica1963 at gmail.com<mailto:arctica1963 at gmail.com>> wrote:

Hi all,

I was wondering if anyone has advice for dealing with raster files that have a few small areas of extreme highs/lows (eg +200/-150), but the main data are much smaller values (+/- 25)?

Using a linear colour scheme, the extremes make the main areas of interest washed out to a great extent so the subtle features get lost. Couln't see any obvious route in v2.6

A way to adjust the curves, like in image processing or a log scale would be useful.

Cheers
Lester

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