What is ISO? When to increase sensitivity, types of noise and more
Types of noise
There are two different types of noise found in digital images. Luminance noise shows up as a speckled pattern, like specks of black sand, and is similar to the grain that was found when using high-ISO black-and-white films.
Chromatic noise is coloured and looks like the rainbow-like sheen when looking at a patch of oil (and is similar in appearance to the blotchy dye patterns that you saw when enlarging high-ISO colour films).
The crops inset are shown in actual pixels.
It’s important to look at these two types of noise separately – as each can be reduced using different tools during the editing stage. These are often provided as separate noise-reduction sliders by a RAW converter (such as in Adobe Photoshop’s Camera Raw utility).
Specialist software (such as Noise Ninja and Dfine) is particularly useful for reducing noise without sacrificing detail.
PAGE 1: What is ISO?
PAGE 2: How ISO works: free cheat sheet
PAGE 3: When to increase ISO
PAGE 4: Types of noise
What is Color Temperature: free photography cheat sheet
Manual focus: what you need to know to get sharp images
10 rules of photo composition (and why they work)
See the light like a pro: everything you were afraid to ask about natural light
10 common exposure problems every photographer faces (and how to fix them)
on Wednesday, June 20th, 2012 at 4:00 am under Beginner.
Tags: camera tips, DLSR tips, hot, ISO sensitivity, photography cheat sheet