/usr/lib/pd/extra/Gem/rgb2yuv-help.pd is in gem 1:0.93.3-13.
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 33 34 35 36 | #N canvas 457 99 472 501 10;
#X text 333 19 GEM object;
#X text 91 412 RGB is red \, green \, blue;
#X text 91 434 YUV is luma and chroma;
#X obj 119 207 cnv 15 70 40 empty empty empty 20 12 0 14 -24198 -66577
0;
#X obj 123 218 rgb2yuv;
#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 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 [rgb2yuv];
#X text 175 11 [yuv2rgb];
#X text 89 388 convert between RGB colorspace and YUV colorspace;
#X floatatom 190 284 5 0 1 1 V=ChromaR - -;
#X floatatom 156 305 5 0 1 1 U=ChromaB - -;
#X floatatom 123 327 5 0 1 1 Y=Luma - -;
#X connect 4 0 7 0;
#X connect 5 0 4 0;
#X connect 6 0 4 0;
#X connect 7 0 19 0;
#X connect 7 1 18 0;
#X connect 7 2 17 0;
#X connect 8 0 13 0;
#X connect 9 0 12 0;
#X connect 10 0 11 0;
#X connect 11 0 4 0;
#X connect 12 0 11 0;
#X connect 12 1 11 1;
#X connect 13 0 11 0;
#X connect 13 1 11 2;
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