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David Payne
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- David Payne
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Oops, I forgot to mention one other thing. I agree with being very careful on using arcsinh. The difficulty, as I see it, is while luminance is "best" stretched using HT or GHS - saturation is best stretched using an "arcsinh" type function. The …
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Mike and Adam, I kind of agree/disagree with both of you. This only seems appropriate since there are three pirmary colours, there should be three opinions. I like Adam's approach regarding step-wise. Removal of the channel first and then stretchi…
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Fantastic job on your explanations, Adam. You obviously work hard on creating these videos, but you also have a gift of explaining things (in addition to astrophotography). Looking forward to the rest of the series... Thanks for creating this res…
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Hi Again, Ferrante. So I spoke too soon, as I didn't realize that your image was a) starless and b) the nebulosity is everywhere in the frame. My reference to the shape of the final "log view" of the histogram was a generalized shape for deep sky …
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Hi Ferrante,Sorry I hadn't noticed this message. In general the goal should be with the first stretch is to create a histogram (in log view) that from left to right, rises to a peak, may deline a bit and then finds a monotonic (constant) slope or g…
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Hi Ferrante, I just posted a "recipe" for a least the initial stretch using GHS on astrobin and pixinsight forums - both of which are accessible via ghsastro.co.uk (or ghsastro.com). 1) Once you have loading your linear image into the script, zoom i…
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Hi Ferranti,I too admired the IOTD, certainly a fantastic image.I would answer your question by first making the distinction between pure stretching (a la HT, GHS, arcsinh, and I don't know about E-Z) is that they have 3 properties: 1) their transf…
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Thanks Anne, for your kind words on the script and videos and for the analysis of the script you have provided on other forums. I have been admiring your images, with a huge dollop of envy, on astrobin. I have been trying to think of the substanc…
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Thanks for engaging in the discussion, but I am a little disappointed in your reaction. Perhaps you are arriving at this discussion from an imagers point of view, while I am coming to it from a mathematics/science viewpoint, with much less backgroun…
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Hi Anne, Thanks for the feedback. I am working on an improved tutorial/guide based on my own use, but it likely won't be up to the caliber I see here...