![]() ![]() But (another annoying limitation of Photoshop) you can't apply curves to 32 bit data in Photoshop so you have to reduce the bit-depth of the data before applying curves of any type. Note that Photoshop is perfectly capable of reading 32bit stacked data from both DSS or PixInsight. The same applies to the highly regarded PixInsight DBE - it won't perform well on the most difficult cases. Alternatively, you can purchase astro plugins to do it but these are unable to cope with the really difficult cases. I have sometimes used this method myself on very difficult gradients in my own 32bit linear data. For instance Roger's method here (see the section "Light Pollution and Airglow Removal") works very well on linear data but use "Levels" rather than "Curves". The skyglow subtraction can also be done on the stacked linear data in Photoshop. I use PixInsight for this and to perform the subtraction of skyglow. ![]() The only way to end up with linear data is to use a traditional astro-processing workflow, stacking raw exposures which are typically calibrated with bias, flats and darks. It's a powerful stretch, best suited to linear data. The context of that statement is when using the Arcsinh Stretch. from DeepSkyStacker) which has the correct white balance and has had the background skyglow carefully subtracted. The linear image you start off with should be a 16-bit linear (i.e. ![]()
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