Tagged Questions
7
votes
2answers
157 views
What does it mean to excite aliases?
I recently came across the phrase 'excited aliases.' The phrase seems to be related to lens sharpness in some way. While a web search turns up the phrase a few times, I am unable to locate a decent ...
15
votes
6answers
3k views
What are jpeg artifacts and what can be done about them?
I know JPEG is a "lossy" compression algorithm that discards information in order to save space. What is the visual impact of this? I've heard of "JPEG artifacts". What do these look like?
Are there ...
34
votes
3answers
13k views
What is moiré? How can we avoid it?
What is the image defect called "moiré"? What causes it, and how can we avoid or reduce it? Is it related to "false color"?
9
votes
7answers
3k views
Why does using flash sometimes create these white spots in the photo?
I have an Olympus FE-190. When I take a picture, with flash on Digital Image Stabilizer (DIS) mode, I get white spots in pictures. This doesn't happen always.
There is only an option called Pixel ...
