IanBarber
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Registered: 01-2011
Location: Doncaster South Yorkshire
Posts: 728
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Contrast Curves
I was recently teaching an online Photoshop workshop and it suddenly struck me that not everyone is comfortable with contrast curves.
The first image is simply a NULL based linear curve and this type of curve will have no effect on the underlying image
The second image shows a typical S shaped contrast curve where most of the contrast will effect the 1/4 shadows all the way through to the 3/4 highlights. We know this because of the steep linear shape to the curve between these points.
The third image however shows a somewhat different story.
If we applied this curve to the image then we are going to achieve a great deal of contrast through the mid-tones all the way to the upper 3/4 of the highlights but the shadow areas would suffer from a decrease in contrast.
The reason why the shadow area would suffer is because of the way the curve flattens out in the 3/3 shadow area.
When applying curves as the chosen adjustment, try to prevent the curve from flattening out unless you are deliberately wanting to remove tone and contrast.
--- Photoshop Panels - Actions - eBooks and more..
http://www.digitalblackandwhite.co.uk
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19/Feb/15, 12:26 pm
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Digital Finger
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Registered: 08-2014
Location: Up Naarfolk
Posts: 1817
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Re: Contrast Curves
brings up the question for me... does it make any difference whether you use levels or curves if you wanted to drken shadows-to get teh same effect in each? I expect exactly the same thing happens to teh fie in practice - non?
I also imagine that using the hsitory brush technique might get you round this problem, or not?
Last edited by Digital Finger, 20/Feb/15, 1:23 pm
--- I am a part of what I am, not apart from what I dream,
That's a part of what I seem, but not apart from what I am
~ Simon
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20/Feb/15, 1:22 pm
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IanBarber
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Registered: 01-2011
Location: Doncaster South Yorkshire
Posts: 728
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Re: Contrast Curves
quote: Digital Finger wrote:
brings up the question for me... does it make any difference whether you use levels or curves if you wanted to drken shadows? I expect exactly the same thing happens to teh fie in practice - non?
You can use Levels to increase / decrease contrast as well and lightening or darkening but unlike using curves you are unable to see the shape of the curve you have created
--- Photoshop Panels - Actions - eBooks and more..
http://www.digitalblackandwhite.co.uk
Personal Website
http://www.ianbarberphotography.co.uk
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20/Feb/15, 1:24 pm
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