Anti-Aliasing Filters...with or without??...

sulhan · 30th June 2004

Hiee all....

Just thought it might be good to share this info on the use of anti-aliasing filter in digital cameras.....some cameras have them and some don't.......see how it may impact your captured image....

http://www.wfu.edu/~matthews/misc/DigPhotog/alias/

One good read on an example of a cmera which does not use anti-aliasing filter.....in trade off to gain sharpness (Perceived by the eyes....read on)...

http://www.imaging-resource.com/PRODS/SD9/SD9A12.HTM

rgds,
sulhanb

Amfibius · 30th June 2004

Thanks for the link sulhan, it was a very interesting read.

Jed · 1st July 2004

The problem with the test converted in the first link is the two cameras compared, the D60 is a 6mp chip and the SD9 is a 3.3mp Foveon X3. While the comparison image illustrates the problem of moire, it doesn't illustrate the detail advantage a non-AA filtered chip possesses as far as detail and sharpness are concerned.

Furthermore, the more pixels the chip has, the less likely aliasing and moire is likely to be an issue, because you will then have the pixels to resolve the fine repeating pattern.

I shoot AA filtered and non-AA filtered cameras side by side, and pixel for pixel, I *much* prefer the non filtered version.

30th June 2004	#1
sulhan Advertiser Join Date: May 2002 Location: Melbourne, Australia Posts: 4,051	Anti-Aliasing Filters...with or without??... Hiee all.... Just thought it might be good to share this info on the use of anti-aliasing filter in digital cameras.....some cameras have them and some don't.......see how it may impact your captured image.... http://www.wfu.edu/~matthews/misc/DigPhotog/alias/ One good read on an example of a cmera which does not use anti-aliasing filter.....in trade off to gain sharpness (Perceived by the eyes....read on)... http://www.imaging-resource.com/PRODS/SD9/SD9A12.HTM rgds, sulhanb Last edited by sulhan; 30th June 2004 at 01:52 PM.

30th June 2004	#2
Amfibius Deregistered Join Date: Jan 2004 Location: Perth Posts: 517	Thanks for the link sulhan, it was a very interesting read.

1st July 2004	#3
Jed Senior Member Join Date: Jan 2002 Location: UK Posts: 3,078	The problem with the test converted in the first link is the two cameras compared, the D60 is a 6mp chip and the SD9 is a 3.3mp Foveon X3. While the comparison image illustrates the problem of moire, it doesn't illustrate the detail advantage a non-AA filtered chip possesses as far as detail and sharpness are concerned. Furthermore, the more pixels the chip has, the less likely aliasing and moire is likely to be an issue, because you will then have the pixels to resolve the fine repeating pattern. I shoot AA filtered and non-AA filtered cameras side by side, and pixel for pixel, I much prefer the non filtered version.