tag:blogger.com,1999:blog-6619753640918133495.post4600505006794666287..comments2023-06-19T05:02:53.155-07:00Comments on MarcWPhoto: My First Really Big Print.MarcWPhotohttp://www.blogger.com/profile/08065637738819949604noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-6619753640918133495.post-56932811705709094022008-12-15T08:16:00.000-08:002008-12-15T08:16:00.000-08:00I think I'll make a nice print of one of the baby ...I think I'll make a nice print of one of the baby pictures I took for my co-worker for her for Christmas. Her husband is going to go through them and pick one out for her so it will be a surprise.<BR/><BR/>"Noise" is the digital equivalent of "grain" in film.<BR/><BR/>Grain in film is caused by the "grains" of light-sensitive material (usually crystals of a silver salt) on the film. The bigger they are, the more likely they are to get hit by individual photons, which makes the film more sensitive to light. So if you want film that works in lower light conditions, you make the grains bigger. But as the grains are enlarged, they become more individually visible and you get more "orphan" grains showing up as darker or oddly colored specks on otherwise lighter or differently colored areas of exposure.<BR/><BR/>Obviously, the photoreceptor sites on a digital sensor never change size, but as the "ISO equivalence" of the sensor is increased, what is happening, metaphorically, is that each site becomes more sensitive to light. On average, that makes the sensor more sensitive, which is the idea, but it increases the likelihood that any given site will report being struck by a photon, even when the ones around it aren't being struck by similar photons, which produces your odd dark or strangely colored dots, referred to as "noise."<BR/><BR/>In both the case of film and light sensors, what's really going on is a lot more complex, but this gives you the flavor of it.MarcWPhotohttps://www.blogger.com/profile/08065637738819949604noreply@blogger.comtag:blogger.com,1999:blog-6619753640918133495.post-18523927188233148752008-12-14T22:49:00.000-08:002008-12-14T22:49:00.000-08:00noise! that is the word i was looking for earlier ...noise! that is the word i was looking for earlier today when i was talking to someone about cameras and ISO.<BR/><BR/>sooooo, what are you going to print next?Elessahttps://www.blogger.com/profile/16486003528916651676noreply@blogger.com