In response to some e-mail comments about my anti aliasing posts, I’ve been thinking about diffraction, and how it affects format selection. In order to clarify my thinking, I prepared the following spreadsheet: In the first column is the f/ stop. The second column is the horizontal or vertical pixel spacing in micrometers of a… [Read More]
Archives for 2011
Antialiasing – email comments
I’ve had some email on the antialiasing posts. One person quotes me from Antialiasing, part 2 as follows: The good news is that increasing the area of the sensor receptors reduces aliasing, and does it fairly efficiently. William Pratt, in his book Digital Image Processing, 2nd Edition, on pages 110 and 111, compares a square receptor… [Read More]
Antialiasing, part 4
Antialiasing the future It’s pretty clear to me that the biggest aliasing problems today are caused by the Bayer pattern and similar methods that construct a color sensor by detecting different spectra at different places on the chip. One way to make a big improvement would be to get all the RGB photosensitive regions that… [Read More]
Antialiasing, part 4: the future
Antialiasing the future It’s pretty clear to me that the biggest aliasing problems today are caused by the Bayer pattern and similar methods that construct a color sensor by detecting different spectra at different places on the chip. One way to make a big improvement would be to get all the RGB photosensitive regions that… [Read More]
Antialiasing, part 3
Sunlit wet asphalt aside, most pictures I make with cameras lacking antialiasing filters look just fine with no special post processing. That doesn’t mean that there’s no aliasing going on; it just means that the artifacts thus produced look fairly realistic and aren’t objectionable. There are two eminently defensible but mutually exclusive perspectives on whether… [Read More]