Pre-emptive cropping

NN635396322977093750UL

• 2015年06月15日 08:33

All my RX100 images taken at wide angle has a crop applied, which takes away a lot of the image, even though the lens distortion, does not require a crop that tight. I can manually correct this, by extending the crop to the edges, but I like the lens distortion applied, but would like to dis-able the crop, without having to do this manually.

http://www.anacropolis.dk/CaptureOnePro/crop1.png


Any way to do this, without changing the camera profile to generic?


Kind regards,

Jan

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  SFA

  • 2015年06月15日 09:09

  There is a reason why the crop is as it is. (See a number of discussions in the forum.)
  
  However if you un-tick the "Hide Distorted Areas" box visible in your screen shot you should see the full uncropped image, as far as I am aware.
  
  Also you may wish to check your output recipes. The currently selected recipe (whatever it may or may not be) might have a ratio set and this could influence the default crop size and position and therefore the eventual amount of image that appears outside the crop area.
  
  HTH.
  
  
  Grant

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  NN635396322977093750UL

  • 2015年06月15日 09:44

  Thank you for your swift reply.
  
  I have read a lot of crop discussions, but cannot find one that explains this. Perhaps i missed it.....
  
  If i un-click the "Hide distorted areas" i get this:
  http://www.anacropolis.dk/CaptureOnePro/crop3.png
  
  And as you can see the crop is not at the edges of the image, which is what i would like to do, and
  i have also checked my recipes.
  
  So without disabling the lens correction, is there a way to get COP to get a crop that goes to the edges as default?
  
  I suppose one work around would be to apply a "crop style" at import. Although i am not sure how to make a generic crop style that would work on both horizontal and landscape images?
  
  
  /Jan

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  SFA

  • 2015年06月15日 12:21

  Jan,
  
  If we assume there is no predefined crop ratio to be applied it seems to be that C1, rather like the camera manufacturers themselves if you look at their JPG outputs, is taking the results of the distortion correction and including what is felt to be a reasonable compromise of distorted areas used to "correct" the image. So you have a very thin strip at the top and bottom of he image which must represent somewhat crushed areas of the original and wider areas at the side of the particualr image that represent somewhat less crushed areas but with potential subject distortion.
  
  In effect the software, C12 or the manufacturer's jpg, is showing you what an equivalent optically corrected lens would have given you on the camera if such a lens existed.
  
  Or, to put it another way, the stuff at the edges an in the corners would not have appeared at all had the lens had its own correction.
  
  As I understand it current optical physics capabilities do not allow small lenses to be corrected in lens and still remain small and "fast" as people want them to be. You might make them a little better if they cost a whole lot more .... but then few people would buy them. In the digital age one can use the unrequired excess capacity of sensors with high pixel counts to 'fix' the lens design and manufacturing issue by allowing unusable parts of a scene to be captured but left distorted and then cut them out and 'fix' the distortions by shuffling pixels (and their colour values) around using mathematical formulas.
  
  So in effect you are not losing any especially notable part of the image with lens correction (when it is needed). Just tossing out the rubbish without having to do it yourself, at least as far as distortion is concerned, that being you main interest at this point.
  
  You can turn the correction off as a default should you wish to do so.
  
  I would guess you will find that there are different adjustments applied for different lens settings - at least that is how it is on my small Canon cameras. Whether you can set up (or need) a different "default" for each lens length setting I don't know.
  
  My assessment of my Canon originated files, based on comparison of the in camera jpg compared to the standard C1 interpretation is that at some lens positions C1 trims a little more than Canon but what is trimmed (taking a crop ratio into account) leaves less distorted subject matter in the C1 result. How important that may be is an individual matter of preference of course. I find C1 a perfectly good starting point and will usually be cropping further anyway depending on subject matter.
  
  Once you start to play around with the more distorted parts of the rejected areas it becomes something of a personal judgement call about how much distortion you find acceptable. If you are a big Fish-Eye look fan maybe turn the adjustment off completely?
  
  
  HTH.
  
  
  Grant

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  NN635396322977093750UL

  • 2015年06月15日 15:43

  Thank you for that detailed description!
  
  It all makes sense now 😉
  
  
  Thanks again.
  
  
  /Jan

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