If the results are stable (say, you take a series of 20 shots, analyze them, and statistically the results are the same), you can try averaging the black shots (you can look up astrophotograpers' sites like or for the procedure) and use them to normalize the real shots. 30% difference of what I would expect (0.62) ISO 6400 uniformity looks better than ISO 25600 and ISO 12800.Į.g. On all ISOs and channels the right is the darkest (less noise?)Ĥ. Green characterisics look similar on ISO25600 and ISO12800, but different from the red and blue channels.ģ. On all ISOs the red and blue channel look very similar from their uniformity (on all ISOs). Also the deviation within a channel is 1.58 (ISO 25600) = 2x 0.80 (ISO 12800) and most values on ISO25600 are double of ISO 12800 values. ISO 25600 and ISO 12800 look identical from their characteristics. I have now put all those numbers (avg) in an excel for analysis:ġ. Dieses habe ich noch mit meiner 30-Tage-Testversion von DxO (unter. Thanks a lot for you analysis and response. So this image also was the ultimate test for the new DxO Photo Lab 4: an image with. Yes, readout issues, pattern noise, and thermal noise all become more visible. Does it have to do with sensor readout itself having a very minimal effect on measured values that become visible on very high ISOs?
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