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Gear - Canon 5D mkIII, 16-35 f2.8L, 24-70 f2.8L, 70-200 f4L IS, nifty 50, 75-300 f4-5.6. Sigma SD Quattro H, Sigma 35 mm Art, Sigma 85 mm Art, Canon G1X MkII, Panasonic Lumix DMC LX3, iPhone.
Ham, I do not do any of those things, unless attempting to restore a photo of an old photo ...
What I consider to be "pure" is global adjustments of around the minima that can be achieved in camera. For example, one cannot adjust cameras in 1/10 or 1/20th of a stop; one cannot remove specular glare;What is "pure"? No need to answer, because really it's whatever you want it to be, within limits already mentioned in answers by Ricktas and myself and also that article I linked to.
I neither add nor subtract anything from any photo I take, with a couple of rare exceptions - e.g. a portrait where I was constrained to shoot from the audience and my flash caused a shadow of an out of frame microphone to be cast on a light coloured wall in the background.
I only very rarely crop images I take. The exception to this is slight rotation when I don't pay sufficient attention to how level I hold my camera/s.
Like most things in life, there are rarely absolutes, much as some may think otherwise. However, one can attempt to attain closeness to such ideals. In this regard, and with this caveat, I try to ensure that my images reflect, as far as possible, what I saw in real life. This includes composition, framing, colour, use of a suitable FL lens, aperture and exposure. Sometimes I get closer than I do at other times. However, at no time do I consider that I "can fix things in post". Rather, I acknowledge to myself at least that I have cocked things up to a greater or lesser degree, and try to learn from those mistakes. Better that than heroic editing to try to pass off a pig's behind as a silk purse ... Just FWIW, and IMHO.Bottom line, I reckon follow your own rules to produce what makes you happy, and if you enter a competition, be bound by the rules others have decided on.
Would a purist be one who only shoots in jpeg?.....
Who knows?
I always shoot RAW + LSF JPEG. I use the JPEGs for emails, posting images on the web and such like. I only rarely bother to PP a RAW file for upload to the web, and the JPEG files I upload are almost invariably just run through an automated PS action that I made years ago. It resizes the image, applies a USM, converts to sRGB and applies a mat and copyright notice.
RAW files get PP in PPRGB 16 for printing etc.