It seems as if ACR (Figure 1) applies some default adjustments to a raw shot upon opening it.īelow we will calculate the exact value of the adjustments that are, by default, applied to the midtone. So, if you were to try and expose your shots so that they looked good and properly exposed in a raw converter “as is”, by default, you would need to underexpose this shot even more, close to 2 EV in total.
Df_CT02.NEF in RawDiggerġ) The previously marked (Figure 1) area of the shot does not look like it’s been flattened into a pancake anymoreĢ) The raw statistics and raw histogram indicate that not only is this shot NOT overexposed, as a matter of fact it is underexposed by nearly a stop (the maximum is below 9200 on a 14-bit scale). To see the raw truth, we can open the same raw shot in RawDigger, with it being rendered “as is” without any adjustments applied: Figure 3. We can look at this embedded JPEG using FastRawViewer. Df_CT02.NEF in ACRĬomparing it to the JPEG the camera recorded, the JPEG looks much less flat in that area (ironically, this is because my cameras are set to custom “flat” picture control, preventing extreme image brightening) When opening this shot in ACR or Adobe Lr (and in some other converters, too) it does look overexposed and flat on the higher tones (see the upper left part of the banana: it’s starting to lose volume, look flat, glossy, nearly featureless the persimmon, conversely, is obviously too bright) Figure 1. That, however, is a subject for another day.įirst, let’s see how this brightening happens in raw conversion.Ĭomparing raw rendered “as is” to its default render in a converterĬonsider the following example.
#Fastrawviewer patch iso#
Of course, brightness also depends on monitor calibration and viewing conditions, as well as the ISO setting in the camera, much the same way the volume control sets the loudness. Brightness is the product of the raw conversion process and as such depends on the settings in the raw converter, including the default settings, which may not be so obvious. While reading, please keep in mind that one can’t judge the exposure by the brightness. Having customized defaults, however, will save you a lot of time down the road. Instead, change the default settings (read on for a suggestion) or adjust on a per image basis. Not a great idea, especially if the light is low and you are already above ISO 400.Īs a result of lowering the exposure you will push the shadows higher on the tone scale while doing raw conversion, thus transposing shadow noise and artifacts (such as banding and blotches) to lighter tones where they are more visible consequently you will reduce resolution in those areas, as more noise and less levels in raw mean less details. Please don’t lower the exposure, you will be underexposing by more than 1 stop in addition to the underexposure due to camera meter calibration. Practical Part: How You Can Override Default Adjustments.Calculating the Brightening Caused by The Default Adjustments.
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