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Photo Critique: Discuss Sharpening...Just a photo of a boat - Mersey Ferry "Snowdrop" recently repainted!! I don't seem to be able to sharpen ...
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Old 15-03-2015, 21:32   #1 (permalink)
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Sharpening

Just a photo of a boat - Mersey Ferry "Snowdrop" recently repainted!!

I don't seem to be able to sharpen this image - used USM - my digital imaging skills aren't up to scratch yet - any advice please


http://i165.photobucket.com/albums/u57/doc60_2007/IMG_0641a_1.jpg[/IMG][/URL]

Think I need to learn how to upload images also!!


Last edited by doc.; 15-03-2015 at 21:47. Reason: Image - no show!!
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Old 15-03-2015, 22:17   #2 (permalink)
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Re: Sharpening

Where was your focus point ? My guess it was in line with the red section of the bridge. The bow and stern are less in focus, and trying to pull these in would be somewhat difficult, so I'm not sure it's your post processing that is so much the issue here but that the original image that lacks sufficient depth of field.

If you could give more detail about the picture and describe where you focussed, the f/stop / focal length used and where you see the issue with focus (e.g. the nameplate or loading markers / plimsoll line).
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Old 15-03-2015, 23:48   #3 (permalink)
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Re: Sharpening

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I don't seem to be able to sharpen this image - used USM
If you mean that there are unsharp parts of your picture which, as Grease Spot said might be due to insufficient depth of field, this cannot be corrected by sharpening.

Sharpening in an editing programme is more about recovering detail that might have been affected in the processing.

Are you going to 100% magnification before sharpening? Also USM sharpening has a different effect on different images which is why there are the 3 sliders in the dialogue box.

FWIW - it looks OK to me.
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Old 16-03-2015, 00:37   #4 (permalink)
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Re: Sharpening

Looks great! This art not a science project
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Old 16-03-2015, 12:06   #5 (permalink)
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Re: Sharpening

Thank you for your replies
I intended to add the following info but had difficulty uploading image

Details:- 1/320, f10, ISO 100, and evaluative metering. and my concern was the name out of focus.
I thought I understood "depth of field" - clearly not.

Thought f8 would generally cover most situations and f10 should have been better, but I'll revisit and shoot several at f14 and above.

Many thanks
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Old 16-03-2015, 13:14   #6 (permalink)
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Re: Sharpening

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Originally Posted by doc. View Post
Thank you for your replies
I intended to add the following info but had difficulty uploading image

Details:- 1/320, f10, ISO 100, and evaluative metering. and my concern was the name out of focus.
I thought I understood "depth of field" - clearly not.

Thought f8 would generally cover most situations and f10 should have been better, but I'll revisit and shoot several at f14 and above.

Many thanks
The one thing you have not given is the distance you were from the boat. Distance to subject also has an affect on the depth of field. Having said that depth of field should not be an issue with those settings. Maybe you were not focussing on the right part of the boat

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my concern was the name out of focus.
That looks more like an exposure issue to me. Are you happy with the focus on the bow?
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Old 16-03-2015, 13:36   #7 (permalink)
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Re: Sharpening

Thanks for the reply Graham


I was about 10 metres from the boat and used a Sigma 17-70, thought using evaluative metering all would be in focus as opposed to spot metering

That looks more like an exposure issue to me. Are you happy with the focus on the bow?[/QUOTE]

The bow doesn't look sharp to me either, could you explain exposure issue to me please
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Old 16-03-2015, 14:24   #8 (permalink)
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Re: Sharpening

Quote:
Originally Posted by doc. View Post
Thanks for the reply Graham


I was about 10 metres from the boat and used a Sigma 17-70, thought using evaluative metering all would be in focus as opposed to spot metering
Metering has no relation to focus. An image can be heavily over or under exposed but still be in focus - just as an out of focus image can be well exposed. They are 2 different things.

Quote:
That looks more like an exposure issue to me. Are you happy with the focus on the bow?
Quote:
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The bow doesn't look sharp to me either, could you explain exposure issue to me please
Thanks
I'm looking at this on my laptop - and my eyes are not as good as they used to be. As I said, the focus looks OK to me, but if the whole bow is out of focus it could be that your focus point was wrong. In general, the depth of field extends 1/3 in front of your focus point and 2/3 behind it. So if you focussed on the middle of the boat and the boat is at an angle to you, the bow could well be out of focus.

Lets assume that the centre of the boat is 10 metres from you, and this is where you focussed. With the settings you have, everything from 2.17 metres from you to infinity should be in focus, so the whole boat should be in focus.

Now I'll explain why I think there is an exposure issue. If you look at the name and the green deck just above the name, and the left hand side of the funnel you can see some flare. This has been caused by a light source slightly behind you and to your left. It is only affecting these areas as the rest of the boat is angled such that the flare is not reflecting towards you. You were using evaluative rather than spot metering so I'll assume that this is like the Nikon Matrix metering where it averages the whole picture. It has done a fairly good job, but the areas where the flare is - and it is worse where the name is due to the shape of the boat narrowing towards the bow and therefore changing the angle of the hull, have been overexposed a bit.

Had you moved left or right from the position that you took the shot, this flare would also move away from the name. it might still be visible elsewhere, but would be in a position where it would not cause you an issue.

If you shot this in RAW, the area where the name is (and the other areas of flare) could be toned down by reducing the exposure in the name area to match the rest of the boat and I think that the name would then be much better defined. Having said that, I'd leave the flare on the funnel and just correct the name and deck.

So to re-cap, your settings should have the whole boat in focus presuming the boat is not closer than 2.17 metres from you and your focus point was 10 metres from you. The area of the hull where the name is looks to be over exposed due to the Sun reflecting straight toward you, and the white paint is exacerbating this effect.
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Old 16-03-2015, 15:09   #9 (permalink)
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Re: Sharpening

Thank you for taking the time to explain Graham - I'll return to the boat soon better informed and hopefully achieve an improved image.
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Old 16-03-2015, 17:46   #10 (permalink)
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Re: Sharpening

I should have added in my reply that going there at a different time of day when the sun is in a different position will also change if and where the flare from the sun would occur. If you camera clock is accurate you took this at about 3pm, so in the morning the Sun will be on the other side, or towards noon high enough to probably give no flare. Remember that white areas will reflect the most light, so watch the other white areas.

An overcast day will be best for no flare.
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Old 16-03-2015, 20:29   #11 (permalink)
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Re: Sharpening

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Old 24-03-2015, 02:03   #12 (permalink)
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Re: Sharpening

I am with Chris for this,,,,, also for something this twangy in the color department I woul slightly up the ISO from one hundred to 200 or a little more, not much. It has worked for me on the creative side to add a color contrast look between the colors and works most of the time. Crispy looking colors or wonderful.Leave at one hundred if you just want to make sure you learn one thing at a time. For me it is an easyier way to add contrast to a color then adding a curves contrast adjusment to a color channel.
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