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DSS doesn't have a background neutralisation tool?? I wouldn't trust using Photoshop to do the task. You need to create three layers to subtract the background and its a complex task to say the least given there is no automatic analysis. You've got to manually perform it. If you are in a position to purchase additional software such as PixInsight, CCDStack, MaximDL, etc (there are many others) you'll find this and many other core tasks such as calibration, combining, deconvolution etc. much easier. You'll likely still use photoshop for bulk of the work but the grunt work, is best handled by the other software previously noted.
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