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When using color coding for UniPOPS graphics, (see Sections 6.6 and 17.7), this coding can be done in the RGB (Red-Green-Blue), or HIS (Hue-Intensity-Saturation, schemes. The RGB system is described in Section 6.6, and in this Appendix we give the full coding table for the HIS system.
The UniPOPS verb COLOR assigns a standard color for all types of displays. Its syntax for the HIS system is,
COLOR(Hue, Intensity, Saturation)
To assign colors in the HIS system, there are 64 hue codes (numbered from 0 through 63), 9 intensity codes (numbered from 0 through 8), and 7 saturation codes (numbered from 0 through 6).
The hue codes are:
0 - Red 32 - Blue 1 - Slightly orangish red 33 - Slightly purplish blue 2 - Orangish red 34 - Purplish blue 3 - Slightly orange red 35 - Slightly purple blue 4 - Orange red 36 - Purple blue 5 - Slightly red orange 37 - Slightly blue purple 6 - Reddish orange 38 - Bluish purple 7 - Slightly reddish orange 39 - Slightly bluish purple 8 - Orange 40 - Purple 9 - Slightly yellowish orange 41 - Slightly reddish purple 10 - Yellowish orange 42 - Reddish purple 11 - Slightly yellow orange 43 - Slightly red purple 12 - Yellow orange 44 - Red purple 13 - Slightly orange yellow 45 - Slightly purple red 14 - Orangish yellow 46 - Purplish red 15 - Slightly orangish yellow 47 - Slightly purplish red 16 - Yellow 48 - Slightly brownish red 17 - Slightly greenish yellow 49 - Brownish red 18 - Greenish yellow 50 - Slightly brown red 19 - Slightly green yellow 51 - Red brown 20 - Green yellow 52 - Slightly red brown 21 - Slightly yellow green 53 - Reddish brown 22 - Yellowish green 54 - Slightly reddish brown 23 - Slightly yellowish green 55 - Brown 24 - Green 56 - Slightly Yellowish brown 25 - Slightly bluish green 57 - Yellowish brown 26 - Bluish green 58 - Slightly yellow brown 27 - Slightly blue green 59 - Yellow brown 28 - Blue green 60 - Slightly brown yellow 29 - Slightly green blue 61 - Brownish yellow 30 - Greenish blue 62 - Slightly brownish yellow 31 - Slightly greenish blue 63 - Gray shades
The intensity codes are:
0 - Very light 4 - Medium 1 - Lighter-light 5 - Medium dark 2 - Light 6 - Dark 3 - Medium light 7 - Darker dark 8 - Very dark
The saturation codes are:
0 - Grayish 4 - Strong 1 - Moderately grayish 5 - Stronger strong 2 - Moderate 6 - Vivid 3 - Moderately strong
For example, to specify a medium-intensity, vivid red in the HIS system, the color parameters are (0,4,6). The HIS system is capable of only a 9 level gray scale (63,0,6) through (63,8,6), so for gray scales the RGB system is superior. However, for an aesthetic color scale, the HIS system is easier to use. For example, the colors (0,4,6), (1,4,6), (2,4,6), (3,4,6), ... (32,4,6) is a color scale that gradually goes from vivid, medium-bright red to vivid, medium-bright blue.
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