None of the effects at picnik is done with pixel level manipulations. They are using Bitmap operations. I don't know, how exactly the exposure effect can be achieved. I would try googling for Flash/Flex experiments. I'm sure you can find somebody explaining/showing it.
Cheers Ralf. On Dec 4, 2007 10:39 AM, larryzzl <[EMAIL PROTECTED]> wrote: > > > > > > > Sorry, I don't understand what you said very clearly. Do you mean that > I should use the single whole ARGB unsigned int value but not a single > color value? I'm not very sure about the "32bit block" in you mail. > But I think some algorithm need to deal with R,G,B color separately. > > Could you give me some code example which can make me understand more > clearly if you have time. > > Thanks > > > > --- In [email protected], DreamCode <[EMAIL PROTECTED]> wrote: > > > > Well... a blur is not at pixel level either.... That can be handled in > > blocks too.... I might see this fairly clear as I come from an ASM > > background...... the thing you need to realize is that performing an > action > > on a 32bit block is not much slower that it is performing the same > action of > > a pixel.... actually the pixel is most likely slower... the cpu > still read > > 32bits although it seems like it only reads one.... but with the single > > pixel it needs to perform an AND when it reads it and 2 x ( AND + OR > ) when > > it writes it ..... with a 32 bit block it is not..... on top of > that, since > > a blur is essentially a form of convolute filter the pixel version > need to > > read it's some radius of neighboring pixels.... radius being the > amount of > > blur to apply. So that's another now we have another stack of single > pixel > > to process.... so now what started out to be a pixel process is actually > > getting/putting another 20 pixels in a 3.0 blur (radius) scenario..... > > > > 323 > > 32123 > > 21X12 > > 32123 > > 323 > > > > Now multiply that by your 0.75megapixels..... IT ADDS UP > > > > --Allan > > > > > > -- Ralf Bokelberg <[EMAIL PROTECTED]> Flex & Flash Consultant based in Cologne/Germany
