4.3.1. COLOR AND GRAY SCALE POSTSCRIPT

next, previous Section / Table of Contents / Index Atoms of different lattice planes or elements (characterized by their nuclear charges) can be painted with different colors on a color screen and printed with different gray scales or colors on a PostScript printer. This allows visual grouping of elements and atom layers in plots. Since BALSAC does not check nuclear charges for consistency they can be assigned values which do not correspond to real systems but help the visual impression. For screen colors BALSAC uses color code numbers nc(i) which are entries to an internal color table of N colors using standard RGB values defined in the initialization file 'balsac2.ini' (or in a user provided initialization file), see Secs. 6.2.15, 6.4.10, 6.4.11. This RGB color table is also used for color PostScript file output to be printed on color or gray scale PostScript printers. In addition, a separate gray scale PostScript output option converts colors to continuous gray tones. The conversion algorithm and additional useful hints are given in Sec. 5.4. next, previous Section / Table of Contents / Index