ART100@psuvm.psu.edu (Andy Tefft) (02/02/90)
If you want to approach the question from the other direction, i.e. what characters can I use for certain grayscales, "Digital Image Processing" by Rafael C. Gonzalez and Paul Wintz has a FORTRAN subroutine for displaying images on line printers, and here's what it uses for its 32 gray scales. The characters in the 4 lines shown are overprinted, so each column forms a single gray level. MMMMMMHHHHHXHXOZWMNOS=I*++=:-.- WWWWWW###*++---- = - - ####0O+- O0O + Not very useful on a terminal screen, I know, but for line printer output it's much better than using individual characters. Andy