Author Topic: Sharpening - How much?  (Read 1472 times)

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Rajdeep Sandhu

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Sharpening - How much?
« on: October 23, 2009, 12:26:57 AM »
Point your browsers over to http://photogipermarket.com/. Some excellent work there in various categories. Most of the photographs just grab you.

I've been poring over the shots that seem to leap out at you. All things being kept constant, the ones that jump out seem to have been sharpened well. Almost to the point where you would possibly edge over into over-sharpening. BUT, these stop just short of that point. Sure, if you're pixel peeping or if you deliberately set out to find something to criticise, you will eventually notice thin halos and other possible artifacts. But, look at the picture as a whole and it works.

I noticed the same thing with Tom Mackie's work tonight. It was excellent, to say the least. But what made the photos pop was the sharpening, again cranked up to that thin line, but not quite over-sharpened. Same thing in his books, which I've spent ages poring over since I got home.

Various tutorials suggest that, for print, you would actually slightly over-sharpen for pictures to appear properly sharpened.

I strongly feel that sharpening does make a big difference to the quality of the finished piece. Perhaps we should focus more on this important skill, too!

Offline Melvin Nicholson

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Re: Sharpening - How much?
« Reply #1 on: October 23, 2009, 07:46:52 AM »
Here, here, that sounds like a campaign for common sense in the sharpening world.  I shall check out the site this afternoon after lectures at uni.  Tom Mackie, he weren't half bad was he?

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Offline Ian Wells

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Re: Sharpening - How much?
« Reply #2 on: October 23, 2009, 10:16:19 PM »
Rajdeep,

The amount of sharpening undoubtedly has a big effect on either the printing or viewing of pictures.  It is also one of those subjects where no one will agree on how much sharpening is required, you can bet those pesky judges will have a few words to say if they think you have over cooked it.

I have attached a link below to the printing section of the book "The creative digital darkroom" that discusses some of the issues with sharpening for print, let me know what you think.  The rest of the book, which of course you have to buy, is an excellent Photoshop book and has more on sharpening.  The one word of warning with the book it is quite heavy going and assumes a certain amount of Photoshop knowledge. 

http://www.creativedigitaldarkroom.com/CCD_Downloads/Chapters_Files/CDD_ThePrint?EismannDuggan.pdf

Ian



Offline Andrew Woodhouse

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Re: Sharpening - How much?
« Reply #3 on: October 24, 2009, 06:41:34 PM »
Hi Rajdeep

I took a look at the site, some nice stuff on it for sure however I think a fair few have been over sharpened. I know a lot is personal taste, but from the few shots I've seen there more than not they've been oversharpened.

You are correct though in saying that many of the leading experts in digital imaging reckon you should slightly over sharpen your images. Especially for print, however the key thing is slightly. People like Jeff Schewe and Michael Reichmann produced a fantastic tutorial on printing called from Camera to Print (http://store.luminous-landscape.com/zencart/index.php?main_page=product_info&cPath=2&products_id=164)

In that they suggest that a halo of 1px will be sufficient as the halo itself won't show in the print, but the rest of the sharpening will.

I think a lot of the issues with sharpening have stemmed from some of the magazines that are out now, how often have they said to sharpen at a 1px radius, 100% amount and a threshold of 0? Each image is different and requires differing amounts of sharpening, in fact the amount changes depending on how you output it. A glossy A3 print will need more than a photo for the web, just as a print on matte paper will generally require different sharpening than one on glossy.

Oh an one other thing they recommended in the Camera to Print tutorial was to view the image at 50% when sharpening instead of 100%. The reason being 50% is normally closer to the printed size. Also a lot of stuff that's visible at 100% on a screen is never translated to the printed page.

Ian the link didn't work for me...

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Offline Ian Wells

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Re: Sharpening - How much?
« Reply #4 on: October 24, 2009, 08:24:04 PM »
Andrew,

Does not seem to want to link directly, hopefully the link/instructions below works.

http://www.creativedigitaldarkroom.com/

Click on Downloads and then at the bottom of the page there is a link to "Bonus PDF Chapter"

Rajdeep Sandhu

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Re: Sharpening - How much?
« Reply #5 on: October 24, 2009, 09:32:01 PM »
It's because the original link has a 'copyright' symbol in it, which perhaps may not be an allowed url on this forum. I noticed it has been converted to a question mark. Thanks for the link, both of you. I agree with Ian and, as I said, I found them well sharpened, stopping just short of going over.

Having said that, my views on HDR have evolved, and my new found taste for sharpening may be a passing phase.
« Last Edit: April 18, 2010, 08:20:02 AM by Rajdeep Sandhu »

Rajdeep Sandhu

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Re: Sharpening - How much?
« Reply #6 on: April 18, 2010, 08:23:59 AM »
A bit of an update on sharpening...

Once you have sharpened your image on a new layer using a plugin of your choice, change the layer mode to darken.

Duplicate this layer and change the mode of the new layer to lighten. Now decrease the opacity of the lighten layer to around 30-50% or as per taste. This gets rid of the pesky halos often evident around objects after sharpening.

You can do the same with the darken layer, but practically, I haven't needed to so far.