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acdsee full screen display resampling quality lacking?



 
 
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Old September 12th 04, 06:14 PM
James Addison
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Dave Martindale wrote:

It sounds like ACDSee uses nearest-neighbour resampling for quickly
resizing too-large images. I still use ACDSee Classic, and it certainly
does just that. While this might have been a good choice when the
typical computer had a 100 or 200 MHz CPU clock, it produces a number of
nasty artifacts, and is a poor choice today. With today's CPUs, it
makes sense to use a resampling algorithm that filters the image
properly while resizing it.

Irfanview gives you the choice of either method, and that's why my
default image-opening application is Irfanview, not ACDSee. Although it
takes a little longer for Irfanview to calculate a properly-resized
image, the result is often much better looking and worth the wait - even
on my ancient PIII-700.

On the other hand, when browsing through a directory full of images, I
still use ACDSee because its one-image read-ahead helps a lot, and when
I'm looking at lots of images the quality of each one isn't so
important.

Another interesting case is Photoshop. Years ago, Photoshop used only
nearest-neighbour resampling for screen display, but it tried to
display at sizes that used integer downsampling ratios (25%, 33%, 50%)
to minimize effects like discontinuities in diagonals. Then at some
version Adobe introduced the "image cache", which is really a image
pyramid, several copies of the same image resampled to several smaller
sizes. Photoshop uses this for displaying reduced-size versions of the
image when it can, giving cleaner-looking results that are more
representative of how the image would look if you really reduced the
image to that size.

Dave


I would invite you to send your thoughts and ideas to
and/or visit the forums at
http://forums.acdsystems.com and put a post up. I will forward your
posting to the appropriate people in ACD Systems.

Thanks for your comments,


--
James Addison
http://www.pjsoft.ca
 




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