#Adobe camera raw orf iso#

If we compare two cameras (or different settings for the same camera or even the same shot from the same camera but processed in different ways), and we’re doing this by looking at two files in a RAW converter, we need to: The original ORF file doesn’t have such a tag, but it is assumed in ACR.Adobe DNG Converter set this tag to non-zero “hidden exposure compensation”.digiKam convertor set the BaselineExposure tag to 0.Second samplers' values: for the original ORF (left), Adobe DNG (middle), digiKam DNG (right) The RAW histograms of all three are once again identical, so we are only going to show the histogram of the original RAW (ORF) file:įigure 7.

#Adobe camera raw orf iso#

Let’s discuss another shot, taken at ISO 200 and two DNG “derivatives”, obtained using the same two converters as in previous, Adobe DNG Converter and digiKam. Correspondingly, the Adobe converter set the necessary tag in the DNG (with a value to replicate their own processing of the original ORF file), while digiKam recorded the value as zero.

The first, meanwhile (the original ORF), doesn’t contain this tag at all, but the Adobe converter “assumes” it.Ī careful reader, having looked at the names of the files in the screenshots, will know that the third shot was converted to DNG with the aid of digiKam, the second with Adobe DNG Converter (version 9.7).

In the second file, it’s not zero (we’ll show what it is a little later).

The third file (the brighter DNG) has the following written in this tag:.The difference is in the metadata! In particular, the effect above is controlled by the BaselineExposure metadata tag, present in DNG: We will answer this one without further ado. The RAW data is preserved and undistinguishable between the three, as we just saw in RawDigger, and yet… Why is this? Both DNG files result from converting the original ORF file (Figure 1. If we take the middle of the three samplers, it’s almost exactly middle grey on the first two files (the value = 119), while the third file (value = 162) has a brightness difference coefficient of 1.97, which constitutes nearly an entire photographic stop: (162/119)^2.2 ≈ 1.97, here we take the ratio to the power of 2.2 to un-do gamma, getting the linear values.

Second samplers' values: for the original ORF (left), Adobe DNG (middle), digiKam DNG (right).