Image resample effect on color
Image resample effect on color
- Subject: Image resample effect on color
- From: Graeme Gill <email@hidden>
- Date: Wed, 15 Oct 2003 10:38:28 +1000
Douglas Rhiner wrote:
>
When resizing an image in Photoshop, what effect do the different resample
>
image modes (Nearest Neighbor, Bicubic & bilinear) have on an images color,
>
if any?
This depends mainly on the nature of the image. If the image has few sharp
transitions in it, then the color space isn't going to make a whole
lot of difference, since the resampling will be taking place between
values that are fairly close to begin with. Error will be small.
If there are sharp edges or transitions in the image, then the
colorspace can affect the result. The most noticeable area this appears
in is anti-aliasing of feature edges. The most accurate results will
be obtained when the resampling is performed in a "linear light" colorspace.
An RGB space with a gamma of 1.0 is such a space, as is XYZ space. You
would need to watch your precision in such spaces (you need more than 8
bits for any sort of quality).
In practice, I suspect few applications go to the trouble of resampling
in a linear light space.
There was an article in the Journal of Graphic tools that covered
this aspect, I think it was <
http://www.acm.org/jgt/papers/Nelson96/>
Graeme Gill.
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