maverick55
Posts: 12
Joined: Wed Dec 27, 2006 4:01 pm

Selective Sharpening

Mon Jan 07, 2008 7:48 am

Can someone please explain exactly what this is and give an explanation as to how you do it. Im happy with selecting just the aircraft when it is only against the sky but how do you go about it when you have something other than sky in the background, buildings, ground etc? Cheers in advance for the help.
 
IL76
Posts: 2237
Joined: Mon Jan 05, 2004 5:43 am

RE: Selective Sharpening

Mon Jan 07, 2008 8:03 am

Are you familiar with working with layers?
 
maverick55
Posts: 12
Joined: Wed Dec 27, 2006 4:01 pm

RE: Selective Sharpening

Mon Jan 07, 2008 8:09 am

I use layers for my normal sharpening, select aircraft --> duplicate layer --> USM --> erase jaggies --> flatten image. Thats about the limit of my expecience with layers.
 
IL76
Posts: 2237
Joined: Mon Jan 05, 2004 5:43 am

RE: Selective Sharpening

Mon Jan 07, 2008 8:28 am

Ok, good. Well... The way I do it is as follows. I select the sky using the lasso tool and invert the selection when all of the sky is selected. Then I do the sharpening process for the plane, erasing jaggies, etc. The rest of the background was also sharpened, so when I feel that the background is sharpenend too much (lines on the runway, lamp posts, etc.) I manually erase the rest of the background with the eraser with a bigger brush, roughly around the airplane. You don't have to be super meticulous though, as the background is usually out of focus anyway and USM doesn't change all that much.

Ed

PS, all actions mentioned above are done on the sharpened layer.

[Edited 2008-01-07 00:30:02]
 
maverick55
Posts: 12
Joined: Wed Dec 27, 2006 4:01 pm

RE: Selective Sharpening

Mon Jan 07, 2008 8:32 am

Awesome, thanks for that, thats exactly whay I've been doing already. In some other threads I've read people have said things like 'could use some selective sharpening around the nose' etc. Is the method much the same, lasso the area etc?
 
IL76
Posts: 2237
Joined: Mon Jan 05, 2004 5:43 am

RE: Selective Sharpening

Mon Jan 07, 2008 9:14 am

Yes. Select the bit that looks softer than the rest, either with the lasso, or free form selection and give it an extra step of USM. In the end, the overall picture should look evenly sharpened.

Ed
 
maverick55
Posts: 12
Joined: Wed Dec 27, 2006 4:01 pm

RE: Selective Sharpening

Mon Jan 07, 2008 9:20 am

Thanks for your replies. Thats cleared up something thats been bugging me for a while.

Dave
 
User avatar
jid
Posts: 889
Joined: Wed Dec 01, 2004 7:37 pm

RE: Selective Sharpening

Mon Jan 07, 2008 10:36 am

You can also selectively sharpen different colour channels. You will notice that most noise is generating in the blue channel when you sharpen, so if you just sharpen the red and green channels you will reduce the amount of noise you create during sharpening.

Jid
G7EPN is back after 15 years! Operating all Bands 80mtrs -> 70cms QRZ DX
 
garry
Posts: 179
Joined: Mon Feb 20, 2006 9:19 pm

RE: Selective Sharpening

Mon Jan 07, 2008 11:29 am

Just to add to Jid's comments - as sharpening is effectively a contrast enhancement along edges ensure that the layer blend option is changed to luminosity. This effectively is the same as sharpening the Lightness channel in lab mode but without the need to convert from RGB to LAB and back again.

Garry
www.garryridsdale.com
 
derstatic
Posts: 42
Joined: Wed Aug 08, 2007 3:14 pm

RE: Selective Sharpening

Mon Jan 07, 2008 11:40 am

That sounds interesting Garry, would you please explain a little further what effect I should expect if I set blending to luminosity rather than normal. I'm quite new with PS and didn't know about this feature. But will do anything to learn more.
 
garry
Posts: 179
Joined: Mon Feb 20, 2006 9:19 pm

RE: Selective Sharpening

Mon Jan 07, 2008 12:49 pm

Joakim - as sharpening is a local contrast adjustment colour saturation may be affected resulting in colour fringing where the sharpening is applied.

The Luminosity blend mode only lets changes to the tonality of the Sharpening layer show through in the image. In other words, any changes to the tones in the Sharpening layer will be seen in the image, but changes to the colors will not be seen. Consequently, colour fringing is avoided.

You can change the layer blend mode easily - it's located at the top of the layers box and defaults to normal, you'll find luminosity right at the bottom - remember you're only changing the blend mode on the sharpening layer.

Hope this helps (and makes sense).

Garry
www.garryridsdale.com
 
javibi
Posts: 1295
Joined: Sat Oct 02, 2004 5:55 pm

RE: Selective Sharpening

Mon Jan 07, 2008 1:18 pm

Using Actions/Masks...My Tutorial With Links! (by JeffM Aug 31 2005 in Aviation Photography)

j
 
derstatic
Posts: 42
Joined: Wed Aug 08, 2007 3:14 pm

RE: Selective Sharpening

Mon Jan 07, 2008 7:06 pm

Thats interesting Javibi, I've been playing around a little with those actions and they seem to work. I don't think I've learned to exploit them fully. But I will reprocess a previously rejected photo and see if I come up with a better result using this method compared to my normal one which has granted me 3 accepted shots from about 30 submitted efforts.

Thanks for the explanation Garry, am I right if I say that the colour fringing is the dark/bright areas around lines that appear from sharpening and that using this method of blending will reduce them and that will cause me fewer rejections for oversharpened/jaggied edges?
 
garry
Posts: 179
Joined: Mon Feb 20, 2006 9:19 pm

RE: Selective Sharpening

Mon Jan 07, 2008 7:20 pm

Hi Joakim -

Quoting Derstatic (Reply 12):
colour fringing is the dark/bright areas around lines that appear from sharpening

Spot on

Quoting Derstatic (Reply 12):
using this method of blending will reduce them

Correct

Quoting Derstatic (Reply 12):
and that will cause me fewer rejections for oversharpened/jaggied edges?

If only I could predict that with some certainty! It should certainly help and together with greater control through masking and careful choice of where to sharpen (i.e don't sharpen deep shadows it will only increase the noise) you will be well on the way.

Best of luck
Garry
www.garryridsdale.com

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