Saturation value in continuous color

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Saturation value in continuous color

Dale Slone
Hi all

Is there a way to specify a saturation value for a vector layer
Properties->ContinuousColor
in the legend?

As a specific case, I have US counties in a shapefile with a feature
of floats with
values in [0.00431, 1.0000]. But the second highest value is 0.1500.
I'd like to
set the maximum color to correspond to 0.15 and higher in order to get a better
color spread. Otherwise most (all) other counties get the same color.
UniqueValues
isn't an option since I need low-high color scaling.

I can certainly use ogr2ogr to remove the county with the dominant value, but
would rather not as this isn't a one-off map.

I'm using QGIS 0.8.0 on Windows from the installer, not source.

Thanks

Dale
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Re: Saturation value in continuous color

Hugentobler  Marco
Hi Dale,

It is unfortunately not possible to set a custom maximum value in the
continuous color dialog. What you could do is to use graduated symbol and
insert the class breaks manually by double clicking on the values in the list
box. In 0.9 developer version, there is also the possibility to automatically
create the class breaks using quantiles and thus consider the distribution of
the values better. However, the features are not coloured continuously with
graduated symbol, but it still may be of use for your purpose.

Regards,
Marco

Am Donnerstag, 29. März 2007 19:17 schrieb Dale Slone:

> Hi all
>
> Is there a way to specify a saturation value for a vector layer
> Properties->ContinuousColor
> in the legend?
>
> As a specific case, I have US counties in a shapefile with a feature
> of floats with
> values in [0.00431, 1.0000]. But the second highest value is 0.1500.
> I'd like to
> set the maximum color to correspond to 0.15 and higher in order to get a
> better color spread. Otherwise most (all) other counties get the same
> color. UniqueValues
> isn't an option since I need low-high color scaling.
>
> I can certainly use ogr2ogr to remove the county with the dominant value,
> but would rather not as this isn't a one-off map.
>
> I'm using QGIS 0.8.0 on Windows from the installer, not source.
>
> Thanks
>
> Dale
> _______________________________________________
> Qgis-user mailing list
> [hidden email]
> http://lists.qgis.org/cgi-bin/mailman/listinfo/qgis-user
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