Originally posted by codiac2600 The only PP is converting from RAW. There shouldn't be any noise reduction unless I left it on in ACR somehow (we all know how effective that noise reduction is too), but for the most part this is 100% no PP.
Nice pictures. Thanks.
However, I see it over and over again and here as well: People compare the ISO quality on images which have been resampled, either intentionally or by the upload process.
There is a simple statistical law which teaches us that a resampling to 50% size is equivalent to a reduction in ISO of 2EV, like from ISO1600 to ISO400. This is because 4 pixels are resampled to a single one which got 4x as much light, corresponding to 2EV.
BTW. This is why the K20D already has better ISO performance by definition: In order to compare to K10D, images must be resampled to ~82% size which reduces noise in the process.
The first image in this thread is 1024 x 680 at ISO3200. It could be a crop but let's assume that it isn't. It is then resampled to 22%. ISO effective = ISO3200 * 0.22 * 0.22 = ISO150.
It is therefore a trivial statement that ISO3200 images, resampled to ~25% size, show no visible noise anymore.
So this entire thread has great shots but cannot make a statement whatsoever about the K20D's high ISO performance.
BTW, I hope the flower picture is a crop because it has slight visible noise.
@Codiac: could you please confirm/contradict those are resampled images and do you have original size crops? Thank You. And no offense intended. I really like your work.
Last edited by falconeye; 03-03-2008 at 07:26 AM.