/usr/lib/pd/extra/markex/rgb2hsv-help.pd is in pd-markex 0.85-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | #N canvas 172 190 432 490 10;
#X text 89 388 convert between RGB colorspace and HSV colorspace;
#X text 91 412 RGB is red \, green \, blue;
#X text 91 434 HSV is hue \, saturation \, value (luminance);
#X obj 123 218 rgb2hsv;
#X msg 163 182 1 0 0;
#X msg 155 156 0 0.2 0.5;
#X obj 123 257 unpack 0 0 0;
#X floatatom 202 279 5 0 0 1 Value - -;
#X floatatom 162 299 5 0 0 1 Saturation - -;
#X floatatom 123 322 5 0 0 1 Hue - -;
#X floatatom 178 84 5 0 1 1 Blue - -;
#X floatatom 141 67 5 0 1 1 Green - -;
#X floatatom 123 49 5 0 1 1 Red - -;
#X obj 123 122 pack 0 0 0;
#X obj 141 103 t b f;
#X obj 178 103 t b f;
#X text 83 9 [rgb2hsv];
#X connect 3 0 6 0;
#X connect 4 0 3 0;
#X connect 5 0 3 0;
#X connect 6 0 9 0;
#X connect 6 1 8 0;
#X connect 6 2 7 0;
#X connect 10 0 15 0;
#X connect 11 0 14 0;
#X connect 12 0 13 0;
#X connect 13 0 3 0;
#X connect 14 0 13 0;
#X connect 14 1 13 1;
#X connect 15 0 13 0;
#X connect 15 1 13 2;
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