Hi List, Last year I was comparing the grain at high ISOs on a couple of DSLRs ( whilst we waited for some wildlife, in a forest).
In an idle moment at the weekend, I tried the same experiments, but figured that the way to do it would be to use a lens cap and compare pure noise from different cameras. The results are quite interesting, but of course hard to quantify. Taking a shot from a DSLR of pure darkness yields little information until the file is taken into photoshop and the contrast increased so that the actual noise can be clearly seen, very much like grain on an high ISO film. My question: 1. Is there any way to count or quantify grain / noise as a percentage of a frame without printing / counting and expensive equipment? 2. Taking the file to 95% contrast, the noise is nomal, at 100% the black and white turns to pure white - does that make sense? It seems correct to me, but I have doubts. Any interesting thoughts would be much appreciated. Nick WB - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Nick Wilcox-Brown W: www.NickWB.com =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
