Setting black, grey, white points

kutnahora

• 2014年12月05日 03:37

Hallo,
Is there any way to set the black, grey, and white points of the curve à la PhotoShop?

e.g.: http://www.digital-photography-school.com/wp-content/uploads/2011/03/correction_3.jpg

Or is there another function that will perform a similar adjustment?
Thanks.

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  BeO

  • 2014年12月05日 08:17

  

  Hi Kutnahora,
  
  I remember somewhere in the online doc or professor blog or ambassador blog it is written that the curve takes the histogram as the input.
  
  This means that all adjustments made with the exposure or levels tool (which are all adjusting the histogram, as you can see) adjust the input for the curve tool
  
  I am not sure but my guess is that you should use the levels tool first, where you can pick shadow and highlight level, and adjust the mid-tones by moving the small middle square, and the latest step would be adjuting with the curves tool.
  
  Best
  BeO

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  Paul Steunebrink

  • 2014年12月05日 13:55

  [quote="BeO" wrote:
  ...
  This means that all adjustments made with the exposure or levels tool (which are all adjusting the histogram, as you can see) adjust the input for the curve tool
  
  I am not sure but my guess is that you should use the levels tool first, where you can pick shadow and highlight level, and adjust the mid-tones by moving the small middle square, and the latest step would be adjuting with the curves tool.
  

  
  This is correct for CO7 and applies to CO8 as well. However, in CO8 you can change the curve endpoints. This is similar to using the levels' black and white point. And the levels' mid grey can be set with curve all the time. Just drag the mid point of the curve up or down.
  
  My experience is that curve adjustments maintain a better tonality than levels adjustments, although the difference is subtle.
  
  I blogged about it for the Image Professor based on CO7, and I rewrote it for CO8 when posting it on my own Image Alchemist site (link below if you are interested).

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  kutnahora

  • 2014年12月08日 03:50

  Thanks for the responses. I am working with negatives, so being able to set a grey point would be very useful - I can white balance on the film edge to (somewhat) demask the image, but there are still different colour casts in the shadows, midtones, highlights.
  Any tips for this?

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