Digital Outback Photo
- Photography using Digital SLRs

 

Workflow Techniques #044

Control Midtone Contrast

review note by Uwe Steinmueller

 
 

We often use S-Curves to enhance contrast. This is actually just fine if we don’t have any problem with darkened/blocked shadows or aggressive highlights. But often you want to improve the contrast without damaging the shadows and highlights.

Note: For many images the differences may be subtle but still strong enough to make improvements to your images. Best you try these techniques yourself. To show the differences we use the symbol to indicate that a mouse over will show the previous or original image (move the mouse cursor slowly in and out of the image).


Mono Lake


We would like to add some midtone contrast to the above image. A good tool to use is PS Shadow/Highlight.


Shadow Highlight



We set all values to zero except the midtone slider.


After Shadow/Highlight

In our workflow we actually perform this operation on a layer. (We describe in our ebooks how to make use of a layer based workflow).



Shadow/Highlight Layer

 

This way we can even make the contrast to strong and adjust the strength via the opacity of that layer.

While this is a good solution it lacks the flexibility we want because Shadow/Highlight cannot be used as an adjustment layer. That is why we use a curve adjustment layer that comes close to mimic the midtone contrast in Shadow/Highlight.


Midtone Contrast Curve

We lock the curve in the shadows and the highlights to protect these important areas of our image.



Midtone Contrast Curves Layer

There is one general problem with using S-Curves to enhance contrast. At the same time we add contrast we also shift the colors and this may be welcome or even not. By setting the Blending mode of this layer to Luminosity we avoid this shift.



Layer set to Luminosity


After Layer set to Luminosity


Often the truth is that you may like some of the color shift but not all of it. This is not to difficult to achieve. We duplicate the curves layer and set the copy to Blending Mode “Color”. Now you can control the color shift by setting the right opacity (we used 50% in our example).



Controlling Color via opacity


Final tweaked image

If you use this technique we would advise you to sharpen first as you then can tweak the contrast and colors by adjusting the two layers any time later:


• Opacity
• Variations of the midtone contrast curve itself

 
 
 
   

For Comments post in our News Group

2000-2007 Digital Outback Photo