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Editorial Team
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Asked: 2026-05-11T22:42:14+00:00

How can I change the bitmapdata of a coloured Bitmap to Black and White

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How can I change the bitmapdata of a coloured Bitmap to Black and White in AS3 ?
I’m developing a simple image editor tool for a CMS in flash.

People should be able to switch the colour of the uploaded Bitmap to black and white. I want the bitmapdata itself to change So I can write it to a ByteArray with Adobe’s JPGEncoder Class afterwards.

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1 Answer

  1. Editorial Team

    this would be the most elegant solution i presume (with source being you BitmapData):

    const rc:Number = 1/3, gc:Number = 1/3, bc:Number = 1/3;
source.applyFilter(source.bitmapData, source.bitmapData.rect, new Point(), new ColorMatrixFilter([rc, gc, bc, 0, 0,rc, gc, bc, 0, 0, rc, gc, bc, 0, 0, 0, 0, 0, 1, 0]));

    with flash.geom::Point and flash.filters::ColorMaxtrixFilter …

    ColorMatrixFilter allows many things, such as hue shifts, colorisation, lightening, darkening and desaturation and so on … otherwise BitmapData::paletteMap and BitmapData::colorTransform are good complements …

    just wanted to note, that using the following

    const rc:Number = 1/3, gc:Number = 1/2, bc:Number = 1/6;

    looks a little more natural, since subjectively, #00FF00 is brighter than #FF0000, which in turn is brighter than #0000FF

    good luck then … 😉

    greetz

    back2dos

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