/usr/lib/pd/extra/Gem/pix_compare-help.pd is in gem 1:0.93.3-9build1.
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 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 | #N canvas 68 190 683 381 10;
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#X text 39 228 Inlets:;
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#X text 17 185 Arguments:;
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#X text 453 60 Example:;
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#X text 71 31 Class: pix object;
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#X obj 77 205 pix_image examples/data/fractal.JPG;
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#X text 47 308 Outlet 1: gemlist;
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#X text 503 88 (JPEG \, TIFF \, ..);
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#X obj 77 205 pix_image examples/data/ducks.png;
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#X text 50 12 Synopsis: [pix_compare];
#X text 29 67 Description: mix 2 images based on their luminance;
#X text 53 281 Inlet 2: gemlist;
#X obj 451 226 pix_compare;
#X text 53 254 Inlet 1: message: direction [0|1]: take lower or higher(default)
valued pixel;
#X text 449 77 open two different images;
#X text 18 81 [pix_compare] compares two images pixel by pixel and
outputs a composite image. [pix_compare] can do a greater than comparison
where a brighter pixel in the right stream will replace the corresponding
pixel in the left stream or the comparison can be reversed and the
dimmer pixel can be replaced. this operation works best using YUV but
can also be effective in RGB.;
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