Hi,
I also remembered where I had seen the 1 x 256 gradient rectangle
shape used as a lookup table for colours - it was not my idea originally:
Check out the LightMaps class in PaperVision3D - this deals with
creating an array of colour values used for looking up the colour of
something which you could adapt for your idea.
org.papervision3d.materials.utils.LightMap is the class you want -
getFlatMapArray is the method.
http://papervision3d.googlecode.com/svn/trunk/as3/trunk/src/org/papervision3d/materials/utils/LightMaps.as
Glen
Glen Pike wrote:
Hi,
From what I can see of the gradient map, it multiplies a grayscale
value by a gradient??
To do this, you need to get your bitmap data into grayscale - use
the ColorMatrixFilter like here:
http://www.actionscript.org/forums/showthread.php3?p=766173
Then you will need to map your grayscale values to a colour value.
I guess one way to do this would be to create a 1 * 256 rectangle
filled with a gradient of your choice. You would then convert this to
a bitmap, then map the value of each pixel in your image you want to
gradient map to the RBG value of the corresponding pixel in your 256
long rectangle:
e.g.
//convert bitmap data to grayscale using the above method,
//pseudocode - you would probably need to call getPixel / setPixel
and other methods...
mapped = new Bitmap(grayscaleW, grayscaleH);
for(each pixel in grayscale) {
var luminance = grayscale[x][y].red; //0-255 could use .green
or .blue as they are all the same value
mapped[x][y] = gradientRBG[luminance];
}
//This means you could use any gradient you want and create it
dynamically, or create it at authortime as long as it is 1 x 256 (you
can make it larger, but you just sample the pixel RGB values from the
first row.
There is probably a quicker way of mapping the values from a
grayscale image to colour values, so have a scout around - maybe play
with FlashFilterLab, but I am guessing the ColourMatrix filter may
help again here...
HTH
Glen
ACE Flash wrote:
any suggestions? please...
On Mon, Nov 10, 2008 at 11:36 AM, ACE Flash <[EMAIL PROTECTED]> wrote:
Hey there, I am going to apply the gradient map effect on a image ( the
name called in photoshop => image => ajustments => gradient map ) .
do you
know how to deal with it in action script 3?
*http://yarra.ath.cx/zmzm/upload/Picture_1.png*<http://yarra.ath.cx/upload/Picture_1.png>
Thank you
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Glen Pike
01326 218440
www.glenpike.co.uk <http://www.glenpike.co.uk>
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