Manually Creating a Colormap: Difference between revisions
Daviddoria (talk | contribs) (New page: You can create an xml file like this: <source lang=text> <ColorMap name="Consistency" space="RGB"> <Point x="-1.000" o="1" r="0.0" g="0.0" b="0.0"/> <Point x="0.000" o="1" r="0.0" g="1.0...) |
(added matlab function to write paraview colormaps) |
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You can create an xml file like this: | You can create an xml file like this: | ||
<source lang= | <source lang=xml> | ||
<ColorMap name="Consistency" space="RGB"> | <ColorMap name="Consistency" space="RGB"> | ||
<Point x="-1.000" o="1" r="0.0" g="0.0" b="0.0"/> | <Point x="-1.000" o="1" r="0.0" g="0.0" b="0.0"/> | ||
<Point x="0.000" o="1" r="0.0" g="1.0" b="0.0"/> | <Point x="0.000" o="1" r="0.0" g="1.0" b="0.0"/> | ||
<Point x="1.000" o="1" r="1.0" g="0.0" b="0.0"/> | <Point x="1.000" o="1" r="1.0" g="0.0" b="0.0"/> | ||
</ColorMap> | </ColorMap> | ||
</source> | </source> | ||
which specifies that values=-1 should be black (rgb=(0,0,0)), values at 0 should be green, and values at 1 should be red. You can then click "Edit color map" -> "Choose preset" -> "Import", select the new xml file, and you will see the colors are interpolated along the new color axis you have defined. | which specifies that values=-1 should be black (rgb=(0,0,0)), values at 0 should be green, and values at 1 should be red. You can then click "Edit color map" -> "Choose preset" -> "Import", select the new xml file, and you will see the colors are interpolated along the new color axis you have defined. | ||
== Writing a Matlab color map to xml == | |||
The following Matlab function writes a Matlab named [http://www.mathworks.com/access/helpdesk/help/techdoc/index.html?/access/helpdesk/help/techdoc/ref/colormap.html color map] to the Paraview xml color map format. The argument to be passed in is the name of the colormap (default is 'jet'). | |||
<source lang=matlab> | |||
function [] = paraview_color_space(scheme) | |||
if (exist('scheme') ~= 1), scheme='jet'; end | |||
colors = eval(scheme); | |||
N = length(colors); | |||
fid = fopen([scheme '.xml'], 'w'); | |||
fprintf(fid, '<ColorMap name="%s" space="HSV">\n', scheme); | |||
for i=1:N | |||
x = [(i-1)/(N-1); colors(i,:)']; | |||
fprintf(fid, ' <Point x="%f" o="1" r="%f" g="%f" b="%f"/>\n', x); | |||
end | |||
fwrite(fid, '</ColorMap>'); | |||
fclose(fid); | |||
end | |||
</source> |
Revision as of 14:22, 14 September 2009
You can create an xml file like this:
<source lang=xml> <ColorMap name="Consistency" space="RGB"> <Point x="-1.000" o="1" r="0.0" g="0.0" b="0.0"/> <Point x="0.000" o="1" r="0.0" g="1.0" b="0.0"/> <Point x="1.000" o="1" r="1.0" g="0.0" b="0.0"/> </ColorMap> </source>
which specifies that values=-1 should be black (rgb=(0,0,0)), values at 0 should be green, and values at 1 should be red. You can then click "Edit color map" -> "Choose preset" -> "Import", select the new xml file, and you will see the colors are interpolated along the new color axis you have defined.
Writing a Matlab color map to xml
The following Matlab function writes a Matlab named color map to the Paraview xml color map format. The argument to be passed in is the name of the colormap (default is 'jet').
<source lang=matlab> function [] = paraview_color_space(scheme)
if (exist('scheme') ~= 1), scheme='jet'; end colors = eval(scheme); N = length(colors); fid = fopen([scheme '.xml'], 'w'); fprintf(fid, '<ColorMap name="%s" space="HSV">\n', scheme); for i=1:N x = [(i-1)/(N-1); colors(i,:)']; fprintf(fid, ' <Point x="%f" o="1" r="%f" g="%f" b="%f"/>\n', x); end fwrite(fid, '</ColorMap>'); fclose(fid);
end </source>