Without pretending to have the inside track on how they do it - I'm fairly sure they accomplish it by some combination of multiplication/division but not on individual pixels, without having spent more than 45 secs looking at it. There's also they option that the accomplish the "realtime" effect by adding a layer filed with a certain color on top and adjust the alpha value. That might be able to mimick the final result without noticable differences and then generate the actual rendering i the background until it's done and the swap of images goes unnnoticed :)
On Dec 3, 2007 7:36 PM, larryzzl <[EMAIL PROTECTED]> wrote: > My image is 1024 * 768. It's so slow. > But the www.picnik.com does it very well. It change the image data so > fast. Please try the Exposure function it the web. I just want to kown > how to do this. > Thanks > > --- In [email protected] <flexcoders%40yahoogroups.com>, > DreamCode <[EMAIL PROTECTED]> wrote: > > > > How big is the image you're processing in pixels? > > > > You have to consider that processing a 400x400 pixel image is a loop > > of 160k iterations.... Now multiply that by the number of cpu cycles > > pr. pixel and you will start to see scary numbers..... > > > > --allan > > > > > > On 12/3/07, Alex Harui <[EMAIL PROTECTED]> wrote: > > > Image processing is always CPU intensive. Flash is not optimized > for it > > > either. > > > > > > > > > > > > ________________________________ > > > > > > From: [email protected] <flexcoders%40yahoogroups.com> > [mailto:[email protected] <flexcoders%40yahoogroups.com>] On > > > Behalf Of Larry Zhang > > > Sent: Monday, December 03, 2007 2:03 AM > > > To: [email protected] <flexcoders%40yahoogroups.com> > > > Subject: [flexcoders] How to improve BitmapData processing speed? > > > > > > > > > > > > Hello all, > > > > > > I am processing a bitmap data in Flex 3 beta 2. I want to do > > > something to the pixels so I need to get them all and add my action to > > > them. But I found it is very slow if I get pixels one by one by using > > > two for loop and getPixel() method. Of course the setPixel() method is > > > also slow. Then I try the getPixels() to gain a byteArray. It's > fast but > > > I still need to loop the byte array and readUnsignedInt() to get every > > > color pixel and set them back. This also takes me much time. > > > > > > > > > > > > Is there any way to make it faster or I just use the wrong > > > method to do such things? > > > > > > > > > > > > Thanks. > > > > > > > > > > > > ============================== > > > > > > Make Every Day Count > > > > > > > > > > > > Larry Zhang > > > > > > > > > > > > > > > > > > > > > > >
