/usr/lib/pd/extra/pdp/pdp_saturation.pd is in pd-pdp 1:0.14.1-3build1.
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 | #N canvas 322 388 509 326 10;
#X obj 39 105 inlet;
#X obj 270 103 inlet;
#X obj 39 255 outlet;
#X obj 85 105 loadbang;
#X text 32 14 adjust colour saturation by applying a gain to the chroma
channels.;
#X text 31 47 this only works for image/YCrCb/* packets and 3 channel
image/multi/* packets containing luma and chroma channels.;
#X obj 39 192 pdp_gain;
#X msg 85 155 chanmask 6 \, gain \$1;
#X obj 85 131 f \$1;
#X connect 0 0 6 0;
#X connect 1 0 6 1;
#X connect 3 0 8 0;
#X connect 6 0 2 0;
#X connect 7 0 6 0;
#X connect 8 0 7 0;
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