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

[Lester Anderson]

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> 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* <http://www.itc.nl/geoinformatics>
>
>
>
> On 21-08-15 17:48, "Lester Anderson" <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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