Minimizing "halo" effect after resizing.

Resizing raster objects. Either shrinking or enlarging, I have always noticed that on sharp or hard edges, Photoshop makes a very faint "halo" like effect that isn't a part of the wanted anti-aliasing that happens when resizing is done.

Is that something that can really be avoided? Or can it only be covered with stuff like the noise filter or just ignored? If there is some actual trick that will avoid this entirely, I would love to know.

I got the same problem sometime and the only I've been avoid this little pixel is whit the stamp tool, I never try other techniques but the stamp have done a great job, so, give it a try

Is it equally bad when you resample down? wierd. Unsharp Mask probably produces the opposite effect you're looking for, am I right? I use that every time I resize. I guess it all depends on what artwork you've got to work with.

As you probably know already, resampling UP in resolution is never good. I still do it, however, since I'm frequently asked to make big ass signs out of the art off of a business card. (seriously, it's pretty ridiculous)

my fix is like this. Blur and Unsharp Mask particular channels, whichever one is worst. Then stamp the crap out of your picture, like Guerill@ said.

Another fix: get Genuine Fractals. get familiar with the demo (you get 10 free uses). Or, use vector art, or ...

you get the idea.

Correct. Downsampling does create artifacting. Not the blurriness that upsampling creates. Just a halo effect on harsh/sharp edges.

As for genuince fractals. I have used it and noticed its only effective at upsampling very small images. The strange painterly-like moire it produces when it upsamples an image does not look that good to my eyes. Photoshop's rescaling method, when done in small steps usually produces better enlargements than even genuine fractals.

The halo isnt very noticable most of the time, but when I do notice it, it irks me just a bit. Using the methods described is what I've applied before, but doesn't solve the basic problem of the halo downsampling effect.

I'm really looking for a way to avoid it altogether.

before downsampling I usually run a small guassian blur on an image... just to feather the hard edges... Then downsample...

After the downsample, I run unsharp mask...
Occasionally, you may find that when you apply the Unsharp Mask
filter a halo appears around areas of your image. To eliminate
the halo, change the color mode to Lab, and select the Lightness
channel. Then apply the Unsharp Mask filter to your image. This
will give you more control over how the filter is applied...

Thats about all I've got MR.B... I know you've prolly already run thru that, but its my 2 pennies.

I really have done most of what you mention Torn. Switching to lab mode and fooling the lightness channel is something I really haven't bothered with, but I'll give it a shot the next time a tasks require it.