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DPChallenge Forums >> Current Challenge >> Save For Web sharpening in Minimal
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10/01/2018 07:37:27 PM · #1
Are each of the types of sharpening legal in Minimal editing since they're each applied to the entire image?

Or what?

I apologize for not already knowing this. :D
10/01/2018 08:02:02 PM · #2
If you are referring to the "types" in Photoshop's Filters > Sharpen then, yes, I believe they can all be applied one or more times to the entire image under Minimal. I almost always use the UnSharp Mask filter for sharpening ...
10/01/2018 08:21:34 PM · #3
Made me look. The official rules say: In Minimal, "You May sharpen your image using any global, non-selective sharpening tool."

That would include quite a few methods including non-Photoshop tools of various sorts, but also excludes many methods that are not applied uniformly to the entire image, for example that rely on limiting sharpening with masks or selections.
10/01/2018 08:23:21 PM · #4
Thank you, Gen.

I use USM, too... but I'm curious about in "Save for Web & Devices", on the "Quality" pull down menu... options like: Nearest Neighbor, Bicubic Sharper, etc.

One has to be selected in order to "Save"...
10/01/2018 08:25:06 PM · #5
Oh... just saw your reply, Bob. Thank you.
10/01/2018 09:15:32 PM · #6
Originally posted by Lydia:

Thank you, Gen.

I use USM, too... but I'm curious about in "Save for Web & Devices", on the "Quality" pull down menu... options like: Nearest Neighbor, Bicubic Sharper, etc.

One has to be selected in order to "Save"...

Those are resampling algorithms, not sharpening -- you can use any that you want.
10/01/2018 09:25:57 PM · #7
YeeeHAW! Thanks again, Gen!
10/01/2018 09:37:40 PM · #8
I meant to add ... I think the "usual" guideline is to use Bicubic Sharper if you are making a picture smaller, and Bicubic Smoother if you are enlarging -- they are the most "accurate" but may produce a larger file and the other modes.
10/02/2018 01:38:39 AM · #9
Originally posted by GeneralE:

I meant to add ... I think the "usual" guideline is to use Bicubic Sharper if you are making a picture smaller, and Bicubic Smoother if you are enlarging -- they are the most "accurate" but may produce a larger file and the other modes.


That's informative. I'll look into that, Gen.

Thanks!
10/02/2018 07:47:36 AM · #10
As I read the Minimal rules, there is no rule against stepwise reduction (in other words, take a 6720px image, reduce it to 4800px, then to 2400, then 1200 (or some similar set of steps). You can control detail retention in this manner, however using "bicubic sharper" at each step *will* result in halos. It's therefore necessary to vary which resampling method you use. It can be a little bit of trial and error, each image is different. Any of this seems to be legal in Minimal.
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