Convert Colour Image to Grayscale

 

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This will allow the user to convert any colour image to grayscale. There are 4 "modes" to choose from. Test it to discover the differences. The code should be placed in a movieScript.

on grayScaleImg (theImage, theMethod) grayImage = theImage.duplicate() Case theMethod of 1: newImage = image(grayImage.width, grayImage.height, 8, #grayscale) newImage.copyPixels(grayImage, grayImage.rect, grayImage.rect, [#dither: 1215]) -- 1969, 1215 grayImage = newImage 2: newImage = image(grayImage.width, grayImage.height, 8, #grayscale) newImage.copyPixels(grayImage, grayImage.rect, grayImage.rect, [#dither: 1969]) grayImage = newImage 3: theWidth = grayImage.width - 1 theHeight = grayImage.height - 1 repeat with x = 0 to theWidth repeat with y = 0 to theHeight theColour = grayImage.getPixel(point(x,y)) -- commented out one is not as rich, but brings out more detail, potentially -- grayComp = (0.2980 * theColour.red) + (0.5882 * theColour.green) + (0.1138 * theColour.blue) -- the below uses these fractions: 54/255 R, 182.5/255 G, 18.5/255 B grayComp = (0.2125 * theColour.red) + (0.7154 * theColour.green) + (0.0721 * theColour.blue) grayImage.setPixel(point(x,y), color(grayComp, grayComp, grayComp)) end repeat end repeat 4: theWidth = grayImage.width - 1 theHeight = grayImage.height - 1 repeat with x = 0 to theWidth repeat with y = 0 to theHeight theColour = grayImage.getPixel(point(x,y)) -- not as rich, but brings out more detail, potentially -- uses these fractions: 76/255 R, 150/255 G, 29/255 B grayComp = (0.2980 * theColour.red) + (0.5882 * theColour.green) + (0.1138 * theColour.blue) grayImage.setPixel(point(x,y), color(grayComp, grayComp, grayComp)) end repeat end repeat end Case return grayImage end