I explain why this is so in my Down with the Noise Webinar, but for now, just take my word for it! Confusion Abounds Once you make adjustments, especially changes to contrast, tone curve, brightness, shadows or exposure you increase the visibility of gaps and noise. What you may not know is that I highly recommend stacking your star trail images without making any adjustments. And there is an Adobe Camera Raw Defaults setting that is automatically applied per each camera type unless the user chooses custom settings. Every time you open a raw file, it is actually opened by Adobe Camera RAW (ACR) which is an internal component common to Photoshop, Photoshop Elements and Lightroom. You may know that Photoshop does not know how to open raw files like NEF, CR2. See below and you will discover that there is some serious misinformation on the web about ACR adjustments.
On the left is an “Auto” Adjustment while the same data on the right is unadjusted.
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