![]() ![]() If I use FRV to look at both the RAW and JPG versions of the same shot, the histogram looks different, but the exposure stats show the same values (that is, the proportion of each channel that is under- or over-exposed). ![]() I shoot RAW+JPG most of the time and my main camera is a Sony A6000. Your questions help us understand what needs to be covered in workflow mini-manuals and tips. I hope I addressed some of your questions. At -8 EV typical flare in a well-controlled studio shot causes non-linearity of more that 2/3 EV. Flare and glare result in the loss of linearity in shadows, which makes white balance and colour control problematic. The reason to keep the underexposure limit below 8 EV is not just noise, but also flare and glare considerations. Depending on the camera and ISO setting as well as on my intended image use I may set it between 7 EV and 10EV. Normally 0.3% poses no problem at all for Lightroom highlight recovery feature (even if in a contigious area of the shot). The amount of clipping to be allowed is somewhat of a personal choice, generally I consider 0.3% in the strongest channel OK, if not in a single important area (to see what is clipped press "o" to display clipping overlay). Having raw histogram allows to avoid such false warnings and to select (for raw conversion) among the series of exposure-bracketed shots the one that is correctly exposed. This happens mainly because before displaying the warning in the conventional case white balance is applied, multiplying the raw values in red and blue channels by 1.6 to 3. For the similar reason, photographers complain on the noise in the red channel in the sky. It is quite an often complaint that when shooting a red rose under daylight the red channel clipping indication based on the "conventional" histogram (in-camera or in a raw converter Lightroom being one of raw converters) is premature, thus leaving the detailed blue channel underexposed and noisy. Raw histograms allow to diagnose false channel clipping, like when shooting saturated objects (flowers, for example). It is also important that the raw histogram in FastRawViewer and RawDigger shows true amount of underexposure on the shot (headroom in highlights), and in FastRawViewer it is easy to see how much exposure can be added. Such a raw histogram is useful when evaluating what can be extracted out of the raw data during the raw conversion that is, for example, how much of real highlight clipping is in the file. Raw histogram in FastRawViewer (and RawDigger, too) is "ground truth" - it is the histogram of the raw data in the shot, before any conversions at all, "as is". Histogram in the Lightroom is based on the current image rendition, that is it is based on the adjustments you've made and conversion Lightroom came up with based on those adjustments as well as its internal design decisions. This is a very neat program and I am looking forward to better understanding how it can be used. It would be really nice to have some tutorials that discuss how to use the information provided and how to apply it to shooting "difficult" scenes.įor example, should the RAW histrogram be interpreted differently from the historgrams I see in Lightroom? How much should I worry about the percentages shown for underexposed and overexposed pixels? ![]() I don't have a good sense of how to judge this just looking at a scene - I was hoping FRV could help with this. I am specifically interesting in uderstanding where HDR processing is needed or will benefit the quality of my photos. I purchased the software not to "cull" RAW images, but to use the RAW display and historgrams to understand exposure and lightling and how to improve my shooting. However, there is little or no discussion of "how" to use the information provided and why you want to examine it. I have downloaded and perused the User Manual - and it is very good, and clear.
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