Color Maps

Applicable version(s):

Development version

_{by Simone Manini, Orobix Srl, Italy}

This tutorial demonstrates how to handle different color maps while rendering a data array in a vmtk viewer script.

Overview

Color maps are available in the following scripts:

• vmtkcenterlineviewer
• vmtkmeshviewer
• vmtkpathlineanimator
• vmtksurfaceviewer

At the moment there are 4 different color maps currently implemented in vmtk:

• grayscale
• rainbow
• cooltowarm (default one)
• blackbody

There is also the possibility to set the number of colors to be used in selected color map. By default a discrete number of colors (256) are used.

Figure 1: vmtk color maps. From top to bottom: cooltowarm (default), rainbow, blackbody and grayscale.

vmtkmeshviewer -ifile surface.vtp -array pressure -legend 1

Figure 2: Cooltowarm color map (default) with 256 colors (default)

vmtkmeshviewer -ifile surface.vtp -array pressure -legend 1 -numberofcolors 8

Figure 3: Cooltowarm color map (default) with 8 colors

vmtkmeshviewer -ifile surface.vtp -array pressure -colormap rainbow -legend 1

Figure 4: Rainbow blue to red color map (default) with 256 colors (default)

vmtkmeshviewer -ifile surface.vtp -array pressure -legend 1 -colormap rainbow -numberofcolors 8

Figure 5: Rainbow blue to red color map with 8 colors

vmtkmeshviewer -ifile surface.vtp -array pressure -colormap blackbody -legend 1

Figure 6: Blackbody radiation color map with 256 colors (default)

vmtkmeshviewer -ifile surface.vtp -array pressure -legend 1 -colormap blackbody -numberofcolors 8

Figure 7: Blackbody radiation color map with 8 colors

vmtksurfaceviewer -ifile surface.vtp -array pressure -legend 1 -colormap grayscale

Figure 8: Grayscale color map with 256 colors (default)

vmtksurfaceviewer -ifile surface.vtp -array pressure -legend 1 -colormap grayscale -numberofcolors 8

Figure 9: Grayscale color map with 8 colors