I am looking for a 5-class qualitative color palette which can be printed in black and white printers.
Below image shows a map in color (top: qualitative, bottom: diverging) and how each looks in grayscale (right hand side). Both color palettes (
Spectral) belongs to ColorBrewer.
- [UL] Qualitative
- [UR] Qualitative
- [LL] Diverging
- [LR] Diverging
I especially suffer to discern groups in the top-right image, while the bottom (spectral) is much better, if not perfect (i cannot say which was blue or red). And according to ColorBrewer the Spectral color scheme (the one I used here) is the only
photocopy safe for 5-class palette.
Reducing classes (to 3 or 4) may be an option, but I am afraid it was not intended purpose of this map.
This is probably not related to GIS softwares, but I basically use QGIS which offers ColorBrewer, cpt-city, and other palettes and color ramps.
@obrl_soil suggested this is Viridis color set
@underdark suggested this is two types of
4 colors + white approach.
LEFT: Orange-Red + white (sequential), RIGHT: Purple-Orange + white (diverging)