different histograms?

edb1

• 2008年04月12日 04:27

I am new to image editing, so this might be a naive question.

In the exposure adjusting tools, there is a histogram on the top, another histogram under the levels adjusting. They are different? why? Do they mean different things?

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  thowi

  • 2008年04月12日 09:55

  [quote="edb" wrote:
  I am new to image editing, so this might be a naive question.
  In the exposure adjusting tools, there is a histogram on the top, another histogram under the levels adjusting. They are different? why? Do they mean different things?

  No - good question!
  The histogram on the top refers to the output. E.g. if you set a different color space for output the top histogram changes. The second histogram in the tab "levels" is the input histogram.

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  edb1

  • 2008年04月12日 15:27

  If one is input, one is output, then they should be the same before any adjustment. But they are not.

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  thowi

  • 2008年04月12日 16:36

  [quote="edb" wrote:
  If one is input, one is output, then they should be the same before any adjustment. But they are not.

  
  They should be the same if you set "embed camera profile" as output in the batch tab.

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  edb1

  • 2008年04月12日 21:47

  I tried that, but they are still not the same.

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  Paul Steunebrink

  • 2008年04月13日 08:28

  [quote="edb" wrote:
  I tried that, but they are still not the same.

  
  Hi edb, I too liked your question and thowi's explanation as well. I think however that there is more applied than just a profile between input and output. I do not exactly know what, but a gamma curve comes to mind.

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  thowi

  • 2008年04月13日 13:50

  [quote="Paul Steunebrink" wrote:
  

  [quote="edb" wrote:
  I tried that, but they are still not the same.

  Hi edb, I too liked your question and thowi's explanation as well. I think however that there is more applied than just a profile between input and output. I do not exactly know what, but a gamma curve comes to mind.

  
  Did you set white balance to "as shot" and the film curve to "linear response"? In this case you should see (almost) the same histograms - maybe little differences but very very similar.

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  edb1

  • 2008年04月13日 14:53

  [quote="thowi" wrote:
  
  Did you set white balance to "as shot" and the film curve to "linear response"? In this case you should see (almost) the same histograms - maybe little differences but very very similar.

  
  
  I tried that, yes, they are very similar now, especially toward the right end of the histogram, the left end still has noticeable difference.

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