/usr/share/gem/examples/04.pix/14.takeAlpha.pd is in gem-doc 1:0.93.3-7.
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 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | #N canvas 426 68 613 402 10;
#X obj 257 92 gemhead;
#X obj 343 168 gemhead;
#X obj 257 244 pix_takealpha;
#X text 18 24 takes the alpha-channel of another image;
#X obj 456 269 pix_texture;
#X obj 456 336 square;
#X obj 456 310 translateXYZ 2 0 0;
#X obj 257 314 translateXYZ -2 0 0;
#X obj 456 289 alpha;
#X obj 257 342 square 2;
#X obj 257 270 pix_texture;
#X obj 257 290 alpha;
#X text 403 173 load an image with an alpha-mask;
#X text 355 245 take the alpha-mask of img2;
#X obj 20 69 cnv 15 220 70 empty empty empty 20 12 0 14 -195568 -66577
0;
#N canvas 0 22 454 304 gemwin 0;
#X obj 132 136 gemwin;
#X obj 67 89 outlet;
#X obj 67 10 inlet;
#X obj 67 41 route create;
#X msg 67 70 set destroy;
#X msg 182 68 set create;
#X msg 132 112 create \, 1;
#X msg 238 112 destroy;
#N canvas 87 154 247 179 Gem.init 0;
#X obj 118 46 loadbang;
#X msg 118 81 reset;
#X obj 118 113 outlet;
#X connect 0 0 1 0;
#X connect 1 0 2 0;
#X restore 289 80 pd Gem.init;
#X connect 2 0 3 0;
#X connect 3 0 4 0;
#X connect 3 0 6 0;
#X connect 3 1 5 0;
#X connect 3 1 7 0;
#X connect 4 0 1 0;
#X connect 5 0 1 0;
#X connect 6 0 0 0;
#X connect 7 0 0 0;
#X connect 8 0 0 0;
#X restore 25 113 pd gemwin;
#X msg 25 89 create;
#X text 21 69 Create window and render;
#X obj 343 210 t a a;
#X obj 257 125 pix_image ../data/temp2.JPG;
#X obj 343 190 pix_image ../data/fractalAlpha.TIF;
#X connect 0 0 19 0;
#X connect 1 0 20 0;
#X connect 2 0 10 0;
#X connect 4 0 8 0;
#X connect 6 0 5 0;
#X connect 7 0 9 0;
#X connect 8 0 6 0;
#X connect 10 0 11 0;
#X connect 11 0 7 0;
#X connect 15 0 16 0;
#X connect 16 0 15 0;
#X connect 18 0 2 1;
#X connect 18 1 4 0;
#X connect 19 0 2 0;
#X connect 20 0 18 0;
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