As it's been said already, you could try converting to HLS and the get the average luminance (brigthness). Here's a handy class to convert from RGB to HSL and viceversa.
http://www.dreaminginflash.com/2007/11/19/hls-to-rgb-rgb-to-hls/ Another approach, which might be faster (but you'd have to test it to see if that's true), could be transforming to bitmap to a grey scale. You would then know how black / white each pixel is, so you could get the average value by adding the value of each pixel and dividing for the total number of pixels. Instead of reading the whole pixel value, you can just read one channel, because since it' s a grey scale, the three color channels will be equal. I've done something similar sometime ago, so based in that, I've put together an example of this idea. import flash.filters.ColorMatrixFilter; import flash.geom.Rectangle; import flash.geom.Point; function getGreyFilter():ColorMatrixFilter { // luminance coefficients const rWeight:Number = 0.212671; const gWeight:Number = 0.715160; const bWeight:Number = 0.072169; var colMatrix:Array = [ rWeight, gWeight, bWeight, 0, 0, rWeight, gWeight, bWeight, 0, 0, rWeight, gWeight, bWeight, 0, 0, 0, 0, 0, 1, 0 ]; return new ColorMatrixFilter(colMatrix); } function toGreyScale(src:DisplayObject):BitmapData { var dest:BitmapData = new BitmapData(src.width,src.height); var greyFilter:ColorMatrixFilter = getGreyFilter(); dest.draw(src); dest.applyFilter(dest,new Rectangle(0,0,src.width,src.height),new Point(0,0),greyFilter); return dest; } function getGreyAverageValue(src:DisplayObject):Number { var greyBmd:BitmapData = toGreyScale(src); var rows:int = greyBmd.height; var cols:int = greyBmd.width; var accum:int = 0; for(var r:int = 0; r < rows; r++) { for(var c:int = 0; c < cols; c++) { accum += greyBmd.getPixel(c,r) & 0xff; // take just one of the RGB channels, since they all have the same value } } return accum / (rows * cols); } var avgGrey:Number = getGreyAverageValue(src_mc); // a value in the range 0-255 trace(avgGrey.toString(16)); Cheers Juan Pablo Califano 2009/3/29 Karl DeSaulniers <[email protected]> > Wow, > Thank you oo so much. > I hope it hasn't been too much trouble, but I really appreciate the help. > > Best > > Karl DeSaulniers > Design Drumm > http://designdrumm.com > > On Mar 29, 2009, at 6:21 AM, Anthony Pace wrote: > > http://livedocs.adobe.com/flash/8/main/wwhelp/wwhimpl/common/html/ >> wwhelp.htm?context=LiveDocs_Parts&file=00001955.html >> >> Karl DeSaulniers wrote: >> >>> Here is my other question. >>> How to identify a pixel in as2. >>> I haven't google'd it yet so that answer my be already out there, but I >>> thought I'd ask. >>> >>> Sent from losPhone >>> >>> On Mar 29, 2009, at 5:48 AM, Anthony Pace <[email protected]> >>> wrote: >>> >>> just noticed that wikipedia has some decent info >>>> http://en.wikipedia.org/wiki/HSV_color_space >>>> >>>> Karl DeSaulniers wrote: >>>> >>>>> Yeh I was going to see if I could adopt the theory into as >>>>> >>>>> Sent from losPhone >>>>> >>>>> On Mar 29, 2009, at 2:23 AM, Anthony Pace <[email protected]> >>>>> wrote: >>>>> >>>>> I just realized the link I have you with the java doesn't really show >>>>>> you anything other than how to use java's Color.RGBtoHSB function... >>>>>> yikes, >>>>>> I told you I was tired >>>>>> >>>>>> This might be a little more helpful. >>>>>> >>>>>> http://www.easyrgb.com/index.php?X=MATH&H=20#text20 >>>>>> >>>>>> >>>>>> Karl DeSaulniers wrote: >>>>>> >>>>>>> Your not alone burning the late night pixels. >>>>>>> >>>>>>> Thanks for your response, this is a good idea. >>>>>>> Then you can get some kind of value that will translate to a >>>>>>> function. >>>>>>> >>>>>>> Hmmmm.. >>>>>>> very interesting. >>>>>>> >>>>>>> Thanks for the links too. >>>>>>> gnight >>>>>>> >>>>>>> >>>>>>> Karl DeSaulniers >>>>>>> Design Drumm >>>>>>> http://designdrumm.com >>>>>>> >>>>>>> On Mar 29, 2009, at 1:48 AM, Anthony Pace wrote: >>>>>>> >>>>>>> Hi Karl, >>>>>>>> >>>>>>>> Kind of tired, so the easiest way I can think of to do this is to >>>>>>>> evaluate and convert each pixel's RGB values to HSB and then average >>>>>>>> your >>>>>>>> found values for all the pixels in the region the loader is to be >>>>>>>> displayed >>>>>>>> within. >>>>>>>> >>>>>>>> Hue, Saturation, Brightness..... if the brightness is less than 50% >>>>>>>> (or 70% to 75% considering how colour value in black levels are shown >>>>>>>> in >>>>>>>> most displays) go with the light coloured loader, else go with dark. >>>>>>>> >>>>>>>> http://www.google.ca/search?hl=en&q=rgb+to+hsb&btnG=Google >>>>>>>> +Search&meta= >>>>>>>> http://www.exampledepot.com/egs/java.awt/color_Hsb.html (should >>>>>>>> be easy to convert to as3) >>>>>>>> >>>>>>>> You could also use the inverse colour of a pixel to make it pop. >>>>>>>> >>>>>>>> Anyone else have any bright ideas? Seriously, I am sure somebody >>>>>>>> knows a better way. >>>>>>>> >>>>>>>> Hoping my 2:41am ramblings help, >>>>>>>> Anthony Pace >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> Karl DeSaulniers wrote: >>>>>>>> >>>>>>>>> I was wondering is there a way to recognize the density of pixels >>>>>>>>> in flash AS2 or AS3? The darkness or lightness. >>>>>>>>> >>>>>>>>> For instance, say I have a loader that is dynamically loaded and >>>>>>>>> normally it would be, say, white. >>>>>>>>> But lets say I want it to have a script that detects the pixel >>>>>>>>> density of the MC behind it so as to let the loader mc know to play >>>>>>>>> on frame >>>>>>>>> 1 or frame 2. >>>>>>>>> Frame 1 having a white loader and frame 2 having a black or grey >>>>>>>>> loader. >>>>>>>>> That way when the loader is dynamically placed over a MC with a >>>>>>>>> picture in it, >>>>>>>>> it will detect if there is a white picture (placing a black loader) >>>>>>>>> or if its a color picture (placing the white loader on top)? >>>>>>>>> >>>>>>>>> Usage would be for say a photo gallery and while one picture is >>>>>>>>> being displayed, and the user clicks a new photo, >>>>>>>>> the previous photo does not remove until the new one is loaded. >>>>>>>>> Thus if I have a white loader and the previous photo was white >>>>>>>>> under the loader, >>>>>>>>> the loader is hard to see and the user sometimes does not know that >>>>>>>>> anything is happening. >>>>>>>>> >>>>>>>>> I basically think it would just take a script that would map out >>>>>>>>> the x and y of the loader >>>>>>>>> and read the pixel density of the MC directly behind the Loader >>>>>>>>> (reason for the x and y theory) >>>>>>>>> then switch so the user will always see a loader. Either grey or >>>>>>>>> white depending. >>>>>>>>> >>>>>>>>> Sounds good in my head, may not be too good (or easy) in code >>>>>>>>> though. >>>>>>>>> Any thoughts would be great, >>>>>>>>> Thanks, >>>>>>>>> >>>>>>>>> >>>>>>>>> Karl DeSaulniers >>>>>>>>> Design Drumm >>>>>>>>> http://designdrumm.com >>>>>>>>> _______________________________________________ >>>>>>>>> Flashcoders mailing list >>>>>>>>> [email protected] >>>>>>>>> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders >>>>>>>>> >>>>>>>>> _______________________________________________ >>>>>>>> Flashcoders mailing list >>>>>>>> [email protected] >>>>>>>> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders >>>>>>>> >>>>>>> >>>>>>> _______________________________________________ >>>>>>> Flashcoders mailing list >>>>>>> [email protected] >>>>>>> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders >>>>>>> >>>>>>> _______________________________________________ >>>>>> Flashcoders mailing list >>>>>> [email protected] >>>>>> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders >>>>>> >>>>> _______________________________________________ >>>>> Flashcoders mailing list >>>>> [email protected] >>>>> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders >>>>> >>>>> _______________________________________________ >>>> Flashcoders mailing list >>>> [email protected] >>>> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders >>>> >>> _______________________________________________ >>> Flashcoders mailing list >>> [email protected] >>> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders >>> >>> _______________________________________________ >> Flashcoders mailing list >> [email protected] >> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders >> > > _______________________________________________ > Flashcoders mailing list > [email protected] > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders > _______________________________________________ Flashcoders mailing list [email protected] http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
