So if I understand you correctly, your question actually is: "how do I find
out which colors are used in my bitmap data?".
I am sorry to disappoint you, but I do not have an answer for you. The only
solution I could come up with is looping through the pixels (see the code at
the end of the email). This loop however is too slow. On my fast machine it
took about 2.4 seconds for an image of 2000 x 2000. If time is not an issue
you could split the loop over multiple frames so you can show a progress
bar.
Maybe someone has a better idea for you...
Greetz Erik
var byteArray:ByteArray = bmd.getPixels(new Rectangle(0, 0, bmd.width,
bmd.height));
var red:Array = new Array();
var green:Array = new Array();
var blue:Array = new Array();
var color:uint;
var redColor:uint;
var greenColor:uint;
var blueColor:uint;
byteArray.position = 0;
while (byteArray.bytesAvailable)
{
color = byteArray.readUnsignedInt();
redColor = (color >> 16) & 0xFF;
greenColor = (color >> 8) & 0xFF;
blueColor = (color) & 0xFF;
if (!red[redColor])
{
red[redColor] = redColor;
};
if (!green[greenColor])
{
green[greenColor] = greenColor;
};
if (!blue[blueColor])
{
blue[blueColor] = blueColor;
};
};
On 2/27/08, Elia Morling <[EMAIL PROTECTED]> wrote:
>
> As indicated in earlier post I need to swap the palettes of a bitmapdata.
>
> "public function paletteMap(sourceBitmapData:BitmapData,
> sourceRect:Rectangle, destPoint:Point, redArray:Array = null,
> greenArray:Array = null, blueArray:Array = null, alphaArray:Array =
> null):void
> Remaps the color channel values in an image that has up to four arrays of
> color palette data, one for each channel."
>
> That is excellent, but how do I extract the current color channel values
> as
> arrays so that I can maniuplate them?
>
> Elia
>
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