Color tables: Difference between revisions

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(how to use grass color rules in qgis if they aren't already there)
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  rm palette_sst.grd
  rm palette_sst.grd
  cptsvg --geometry=300x45 -o palette_sst.svg -v palette_sst.cpt
  cptsvg --geometry=300x45 -o palette_sst.svg -v palette_sst.cpt
 
 
You can then copy the resulting .svg file into <tt>/usr/share/qgis/resources/cpt-city-qgis-min/grass/</tt> on Linux (or <tt>C:\Program&nbsp;Files\QGIS&nbsp;VERSION\apps\qgis\resources\cpt-city-qgis-min\grass\</tt> on MS Windows).
 


[[Category: Documentation]]
[[Category: Documentation]]
[[Category: Colors]]
[[Category: Colors]]
[[Category: VTK]]
[[Category: VTK]]

Revision as of 03:39, 16 June 2016

About

Color tables live in $GISBASE/etc/colors (see SVN)

Modules

Addons

Repositories

  • There is an online colormap repository with many fine GMT (and many others) gradients at
http://soliton.vm.bytemark.co.uk/pub/cpt-city/
  • There are a number of command line tools for working with the GMT .cpt files at
http://soliton.vm.bytemark.co.uk/pub/jjg/en/code/cptutils/

Examples

Built in

The numeric values of following color tables can be found in the here






























Addons

These user contributions can be found in the GRASS addons SVN repository







  • The script used to create these thumbnails can be found on the discussion page.

Using GRASS color palettes in QGIS

Most of them can already be found there, you just have to hunt for them. In the raster layer properties window's style tab, select "Singleband pseudocolor" as the type, "Generate new color map", "New color ramp", for ramp type choose the "cpt-city", change to the sort by author tab, and look for "grass". They can also be found in the QGIS section cpt-city's QGIS theme.

If there's a new set of color rules which are not in QGIS, you can prepare a .svg palette file for use with QGIS using the following commands. Consider to then open a ticket in the QGIS issue tracker asking them to add it (and attach the file of course to save someone some work :)

You will need the cptsvg command line tool from cptutils and the GRASS 6 addon module r.out.gmt.

Examples:

g.region n=100 s=0 w=0 e=100 res=1
r.mapcalc "dummy = row()"

r.colors dummy color=roygbiv
r.out.gmt dummy out=roygbiv
rm roygbiv.grd
cptsvg --geometry=300x45 -o roygbiv.svg -v roygbiv.cpt

r.colors dummy rules=~/grass/svn/grass-addons/grass6/raster/r.colors.tools/palettes/palette_sst.gcolors
r.out.gmt dummy out=palette_sst
rm palette_sst.grd
cptsvg --geometry=300x45 -o palette_sst.svg -v palette_sst.cpt


You can then copy the resulting .svg file into /usr/share/qgis/resources/cpt-city-qgis-min/grass/ on Linux (or C:\Program Files\QGIS VERSION\apps\qgis\resources\cpt-city-qgis-min\grass\ on MS Windows).