>> 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... >>
I think once you get your gradient data into a R,G & B array, you do have a faster way to apply the mapping, without a bunch of setPixel / getPixel calls. You could use the paletteMap method and pass the grayscale as the source, and the gradient data for the R,G & B channels. Cheers Juan Pablo Califano 2008/11/10, Glen Pike <[EMAIL PROTECTED]>: > > 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 >>> >>> >>> >> _______________________________________________ >> Flashcoders mailing list >> [email protected] >> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders >> >> >> >> > > -- > > Glen Pike > 01326 218440 > www.glenpike.co.uk <http://www.glenpike.co.uk> > > _______________________________________________ > Flashcoders mailing list > [email protected] > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders > _______________________________________________ Flashcoders mailing list [email protected] http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
