/usr/lib/pd/extra/pdp/pdp_conv_emboss.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 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | #N canvas 172 505 641 290 10;
#X obj 30 55 inlet;
#X obj 29 206 outlet;
#X obj 29 93 pdp_conv;
#X obj 29 126 pdp_add;
#X obj 108 9 loadbang;
#X obj 218 86 pdp_conv;
#X obj 29 176 pdp_affine 1;
#X msg 108 151 0.5;
#X msg 108 37 hmask 1 0 0;
#X msg 218 35 hmask 0 0 1;
#X obj 145 151 inlet;
#X text 142 178 this uses pdp_conv \, pdp_add and pdp_affine to produce
an emboss effect using the convolution mask (-1 0 0 \; 0 0 0 \; 0 0
1) the right inlet sets the chroma offset.;
#X msg 218 60 vmask 0 0 1;
#X msg 108 60 vmask -1 0 0;
#X msg 108 128 chanmask 1;
#X connect 0 0 2 0;
#X connect 0 0 5 0;
#X connect 2 0 3 0;
#X connect 3 0 6 0;
#X connect 4 0 8 0;
#X connect 4 0 9 0;
#X connect 5 0 3 1;
#X connect 6 0 1 0;
#X connect 7 0 6 2;
#X connect 8 0 2 0;
#X connect 8 0 13 0;
#X connect 9 0 5 0;
#X connect 9 0 12 0;
#X connect 10 0 6 2;
#X connect 12 0 5 0;
#X connect 13 0 2 0;
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#X connect 14 0 6 0;
#X connect 14 0 7 0;
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