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Forum: Digital Processing, Software, and Printing 10-19-2017, 01:01 PM  
Lightroom Woes
Posted By stevebrot
Replies: 24
Views: 1,870
...same here at latitude N 45 42'...


Steve
Forum: Digital Processing, Software, and Printing 10-18-2017, 09:15 PM  
Lightroom Woes
Posted By stevebrot
Replies: 24
Views: 1,870
The lesson of Sunny 16 is that "accurate exposure" means nothing in the real world.


Steve
Forum: Digital Processing, Software, and Printing 10-17-2017, 07:48 PM  
Lightroom Woes
Posted By stevebrot
Replies: 24
Views: 1,870
Be aware that the JPEG brightness and contrast settings may influence the in-camera histogram. I don't have a K-50 at hand, but know this is the case for my K-3. Again, the histograms for both the camera and Lightroom represent the processed image's brightness distribution. They do not represent the camera's exposure meter reading or the base sensor response.

Yes, I know. This is a bit problematic, particularly if one is doing ETTR or some other histogram-dependent exposure scheme, but that is how it is. The histogram is never based on the RAW sensor response. White/highlight clipping is always a combination the actual exposure plus downstream image processing and quite legitimately so is the histogram.

My practice is to routinely use the "natural" custom image setting for RAW capture. Doing so provides a histogram that is generally representative of the subject as seen by the eye.


Steve
Forum: Digital Processing, Software, and Printing 10-17-2017, 07:11 PM  
Lightroom Woes
Posted By stevebrot
Replies: 24
Views: 1,870
This is pretty much the rule. The in-camera histogram is based on the preview JPEG, which in turn reflects the JPEG image settings. Lightroom's, OTOH, is based on its RAW conversion as modified by the import profile and whatever settings applied in PP.



What import profile are you using? If other than Adobe Standard, you might want to switch to that.



Those profiles only apply to in-camera JPEG, in-camera RAW conversion, in-camera image review (JPEG and RAW), and RAW conversion using the Pentax software that came with your camera. In other words, proprietary Pentax stuff. Lightroom does not have the means to reproduce them for RAW conversion* and simply ignores them.


Steve

* This is generally the case, though Lightroom does have Pentax-provided import profiles that correspond to several of the custom image settings for several cameras. I don't remember if those include the K-30/K-50 models.
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