René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Problems with blur/blend methods","articleBody":"_Original author: andres.c...@gmail.com (August 16, 2012 16:23:17)_\n\nThe following sketch:\n\nPImage clean;\nPGraphics pgr, pgb, pgg, pgp;\nint lastTime = 0;\nPFont myFont;\nString renderer = P2D;\n\nvoid setup() {\n  size(320, 240, renderer);\n  pgr = createGraphics( width, height, renderer);  \n  pgg = createGraphics( width, height, renderer);  \n  pgb = createGraphics( width, height, renderer);\n  pgp = createGraphics( width, height, renderer);\n  noSmooth();\n  myFont = createFont(\u0026quot;Arial\u0026quot;, 28);\n  textFont(myFont, 28);\n}\n\nvoid draw() {\n  background(0);\n  fill(255);\n  text(\u0026quot;CODE\u0026quot;, 20, 30);\n\n  noStroke();\n\n  fill(255, 255, 0);\n  ellipse( 70, 70, 20, 20);\n\n  fill(255, 0, 0);\n  rect( 100, 100, 10, 30);\n\n  fill(0, 255, 255);\n  ellipse( mouseX, mouseY, 20, 20 );\n\n  /// Post scene effects follow.\n\n  if ( mousePressed ) {\n    return;\n  }\n\n  clean = get();  \n  background(0);\n\n  pgr.beginDraw();\n  pgr.tint(255, 0, 0);\n  pgr.image(clean, 0, 0);\n  pgr.endDraw();\n\n  pgg.beginDraw();\n  pgg.tint(0, 255, 0);\n  pgg.image(clean, 0, 0);\n  pgg.endDraw();\n\n  pgb.beginDraw();\n  pgb.tint(0, 0, 255);\n  pgb.image(clean, 0, 0);\n  pgb.endDraw();\n\n  if ( millis() \u0026gt; lastTime + 100 ) {\n    pgp.beginDraw();\n    pgp.background(255);\n    pgp.loadPixels();\n    for (int x=0; x\u0026lt;pgp.pixels.length; x++) {\n      pgp.pixels[x] = color( random(128) );\n    }\n    pgp.updatePixels();\n    pgp.endDraw();\n    lastTime = millis();\n  }\n\n  image( pgr.get(), -int(random(1, 4)), 0);\n  blend( pgg.get(), 0, 0, width, height, 0, 0, width, height, ADD);\n  blend( pgb.get(), int(random(1, 4)), 0, width, height, 0, 0, width, height, ADD);\n  blend( pgp.get(), 0, 0, width, height, 0, 0, width, height, SCREEN);\n\n  if ( random(1) \u0026lt; .5 ) { \n    filter( BLUR, int( random(2) ) );\n  }\n}\n\ngenerates entirely different outputs when using either JAVA2D (assumed to be the correct result) and P2D (see attached images).\n\nThis might be pointing to an issue with the blur and/or the blend methods.\n\n_Original issue: http://code.google.com/p/processing/issues/detail?id=1186_\n","author":{"url":"https://github.com/processing-bugs","@type":"Person","name":"processing-bugs"},"datePublished":"2013-02-10T17:25:36.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/1224/processing/issues/1224"}