Using the Curve tool to visualise dust spots

Lars Broberg

• 2016年10月11日 11:42

In one of the latest webinars David showed an interesting way to visualise sensor dust using the Curve tool.
He used a preset in Curves which made it very easy to find dust spots.

I tried to do the same, using the spot tool to remove the spots.
But when I reset the curve tool, either using another preset, or by reset the changes I've made, the spots reappears.
Shouldn't the spot tool work "by itself", so when I make an adjustment in Curves the spots I have removed stays removed?

There may be a step I have missed, some trick to make this work...

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  HansB

  • 2016年10月11日 12:27

  Out of curiosity: could you point me to the webinar and play time?
  
  
  Regards,
  Hans

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  Lars Broberg

  • 2016年10月11日 13:45

  Sure Hans
  
  Here is the webinar, and the time where David talks about the "trick"
  
  https://youtu.be/okVI9fArHe8?t=59m18s
  From 59:18 to 1:01:25

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  HansB

  • 2016年10月11日 15:50

  I'm a bit confused by 'dust' and 'spot' in your post. The 'Spot Removal' tool offers both.
  
  I've tried the following:
  + change luma curve (like in the video)
  + add a dust removal (sensor dust)
  + add a spot removal (flying bird)
  + reset luma curve
  The dust is still removed, the spot too. No tricks applied.
  
  Btw, I would either use a individual curve per image or combine the preset with individual, harsh clipped upper and lower levels in the level tool to get the dust (not spot) brightness to a level where the curve creates high contrast. At the turning points of the up-down-up curve, the dust 'magically' vanishes.
  
  
  Regards,
  Hans

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  Lars Broberg

  • 2016年10月11日 20:09

  Thank you very much for your help HansB, I appreciate it!
  
  I found the "error", why it didn't work for me.
  I was using presets for the Curve tool.
  
  I chose the "5-point-AllChannels" as in the video.
  Changed the curve, again as in the video.
  Removed spots, spot tool, type "spot" and not "dust".
  When I reset the Curve tool, the spots I had removed came back.
  
  But if I instead don't use the presets, just manually change the luma curve.
  Remove the spots, and then reset the Curve tool - IT WORKS!!
  
  Again, thanks a lot for helping out HansB

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  HansB

  • 2016年10月11日 21:15

  Funny. I can use the '5-point-AllChannels' and modify it. And I can use the up-down-up curve saved as user-preset.
  In both cases, removed spots remain removed.
  
  I wonder what the difference is that makes it work. I'm working on Canon cr2 raw files, no adjustment layers.
  
  
  Regards,
  Hans

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