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#X obj 40 67 shunt 2;
#X text 7 104 simple per-channel threshold;
#X text 276 53 bluescreen luma threshold;
#X text 340 195 here we have a mask;
#X text 320 207 (alpha as separate image);
#X obj 257 278 @join 2;
#X text 346 226 make a RGBA image;
#X obj 270 88 t b a a;
#X text 210 379 = medium blue;
#X obj 257 221 t a a;
#X obj 121 416 fps;
#X floatatom 146 418 5 0 0 0 - - -;
#X obj 40 29 metro 100;
#X msg 70 378 240 320 3 # 0 0 170;
#X text 279 68 with alpha channel;
#X text 13 349 you could also load a picture;
#X text 13 361 instead of using uniform blue;
#X text 58 10 1000/100 = 10 fps (max) (adjustable);
#X obj 40 48 #camera;
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#X text 0 -32 Copyright 2002 Mathieu Bouchard;
#X obj -15 450 cnv 15 580 30 empty empty empty 20 12 0 14 -200249 -66577
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#X text -7 457 GridFlow 0.8.0;
#X text -7 457 GridFlow 0.8.0;
#X text 0 -45 threshold.pd;
#X obj 257 259 #store;
#X obj 257 240 #finished;
#X obj 314 145 # * 255;
#X obj 314 126 # >=;
#X obj 314 107 #rgb_to_greyscale;
#X obj 70 397 #draw_image put \, alpha 1;
#X obj 40 166 # -;
#X obj 40 185 # max 0;
#X obj 40 208 # ||;
#X obj 40 227 # +;
#X obj 40 416 #out window;
#X text 387 -38 see also color_detect.pd;
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