# Montage Viewer: Grayscale Color Tables

Grayscale Color Tables.The "`-gray`" directive described in the previous section defaults to a simple linear black-to-white color table (color table 0 below). More generally, there is a set of pseudocolor tables to choose from using the "`-ct <number>`" directive (e.g., "`mViewer -ct 4 -gray SDSS_g.fits -0.5 max gaussian-log -out m51.png`"):

Color table 0 | Color table 1 | Color table 2
Color table 3 | Color table 4 | Color table 5
Color table 6 | Color table 7 | Color table 8
Color table 9 | Color table 10 | Color table 11

Data: SDSS_g.fits