On Tue, Dec 06, 2005 at 08:19:23AM -0600, Lars Michael wrote: >> >consider that upsizing any JPEG >> >would mean starting from a file that already has less information than >> >was originally captured. >> >> Could you elaborate on this please? Have you any specific references you >> could point me towards? > >I am told this is due to the fact that the bayer >matrix has two green for every red and blue. So >technically the green channel has higher resolution.
There are twice as much green sensors in most digital cameras. I'm told this is because our eyes see green the best. The real problem with changing a jpg is that a jpeg is 8 bits per color, while the raw is 12 bits per color. Anything that might change a color value in a jpeg has less data to work with. Those 8 bits are more than most printers can print, and more than most eyes can see, but if you decide to manipulate the colors, then the limitations of only having 8 bits will start to come out visually in the image rather quickly. I am not sure, however, if upsizing an image causes any color changes. My first thought is that it shouldn't, but I could be wrong. -- void *(*(*schlake(void *))[])(void *); * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
