Imports are being added with a 1-11/2 increase in exposure

Greg14

• 2015年10月11日 01:43

I have been trying my best to use this program but it bites me every time.

I have been watching the webinars and making adjustments as I learn.

I imported directing from a Camera SD Card and they look awful.
Imports are being added with a 1-11/2 f stop increase in exposure.

In checking I notice that the "Auto Adjust" and "Include Existing Adjustments" boxes are check.

I realize that it is best to leave it unchecked but how can the Auto adjust be so wrong ?
The ones that I consider under exposed are now over exposed and the ones that I consider close or slightly over exposed are really over exposed.

I trashed them and took off the "Auto Adjust" and the were imported as the camera shot them.

How can "Auto Adjust" be so wrong ?
What is the parameter the it uses?
It is almost as if it reads the worst under exposed image and made the adjustment to all the images.

Obviously I will no longer use it unless there is something I did incorrectly and can be corrected .

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  paintbox

  • 2015年10月11日 13:04

  I'm curious. if you hit the auto on the exposure tool, does it have the same effect.
  Also, as another experiment on the over exposed images (if you are bored)
  Reimport them with the auto adjust ticked, but use a linear curve.
  And another experiment. After they are reimported using the auto adjust on import click the auto on the exposure tool and see if it changes.
  This is for no real benefit other than learning a bit more about C1.
  Plus, like I said, I'm curious.

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  SFA

  • 2015年10月11日 14:33

  Greg,
  
  If you want to see what the Auto exposure is doing (which to a large extent is dependent on which of the possible adjustments it can be used for are currently activated) you need to see the details of how C1 understands the data.
  
  Remember that using the Auto Adjust is entirely optional. In fact for many situations it may well be inappropriate since the only logical objective for such a tool to be used generically for exposure is to spread (or compress) the available data to make a more evenly visible image. Doing so may offer a useful starting point or it may not. The success rate will depend on the image and your objectives for it.
  
  In the exposure tab toolset there is a Histogram tool. Have this open. It will show you the current state of the image as edited (if you cropped it it will show what is in the crop).
  
  The is also an Exposure Evaluation tool which displays the Evaluation for the basic file with Base Characteristics set but without the primary changes of any further editing. It is included in the Tethered toolset and may be of particular use in a controlled shooting environment but has wider applications - such as comparing what the Auto Adjustment tool is doing when used for Exposure.
  
  So open up the Exposure Evaluation tool as a floating tool. You can then compare the two histograms and get a better appreciation of the adjustments being applied to the image.
  
  So, take a new and as yet unedited image with NO adjustments applied on import (if necessary create a NEW variant of an already imported image and then, just to be sure, Reset it so there are no extra adjustments).
  
  Compare the two histograms. They may appear a little different but should be broadly similar in shape. Consider what the Exposure Evaluation histogram is telling you.
  
  http://help.phaseone.com/en/CO8/tethere ... ing#item16
  
  Now apply the Auto Adjustment, ensuring that at least the Exposure adjustment is ticked, and see what difference it makes to the image and the histograms. The Exposure Evaluation Histogram should remain much the same if only the Exposure is being adjusted. The Histogram in the main Exposure tool set may change quite considerably. (It is best to use a rather dark or a rather light image for the comparison since the differences will be easier to spot).
  
  See where you get with that. If necessary we can continue investigating the effects you are seeing once you have some results to compare. In principle the Auto feature will be looking to balance things across the available Dynamic Range visible in the Exposure Tool Histogram. So it may stretch things left to right, right to left of form the middle out both ways. Or it may compress things if the existing DR seems to be too great. (A partial HDR type adjustment perhaps.)
  
  If the histogram looks reasonably OK and central in the range displayed but the onscreen image looks too dark or too light over all you may want to check the brightness of your screen as a starting point just to be sure it is giving you something realistic.
  
  Also check whether you are applying any Presets or Styles that might be adding to the Auto Adjust during the import process. You may, for example, have set a default adjustment for all images from the camera that is being applied in addition to the Auto Adjustment. It's difficult to tell without doing some investigation.
  
  However the bottom line is that the Auto Adjust is potentially useful as a feature but is not likely to be any sort of full proof way to get an image looking how you want it to look all of the time for all images. Let's face it, it has user settable parameters. There is no reason to expect that we users can set those to give us the results we want in all cases.
  
  HTH.
  
  
  
  Grant
  
  
  
  
  Now click the Auto Adjust and see what happens.
  
  Using the

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