>As far as previewing is concerned, the data used for creating the proxy preview is the "actual data".
It is a proxy generated from the original data. How do you explain that the preview is the raw data? Clearly it isn’t. It was generated from that raw data source as a proxy preview, based on the current rendering instructions. And that preview (depending on the module) is a low rez version simply used to show you the current state of what the rendered data might look like IF you render it.
>Rest assured I understand the difference between rendering a preview and rendering a final output file.
Good. Because it is the rendered data we all end up with (whether we send it though the print module, ask for it to end up on the web, or export). There IS an option to print the data from a existing preview if you want to get precise here (Draft Mode Printing).
>>However, you should have just included the part that followed the quote you truncated: "... in the true sense of the word when you don't save over your original but always keep inventing new names for your image versions."
No, I think you are still contradicting yourself because the original data in this case of a raw is always left untouched. I’m referring to the rendered data. To say that applying a clone stamp as a metadata instruction in LR destructive and the same in Photoshop where one app takes the raw data and the instruction and renders virgin pixels from the two, and suggesting the same is true in a pixel editor is a poor way to describe the differences in the processing and resulting data.
IF you want to say that non destructive editing is such that the original is left untouched, without taking the iterative data into the discussion, you can say we’ve had non destructive editing in every application ever made, since computers have provided a Save As command.
With an Adjustment layer, the data (source) is non destructive. And the iteration is too, until you flatten the layer (or print the data). 99 times out 100, that has to happen. You started with exiting rendered data, you edited that data. There is some data loss due to rounding errors (we can agree that it is moot but the facts of the resulting data are what they are). When you take raw data and instructions, you render data for the first time. How then is this destructive?
>>In my initial comment, I was using "destructive" as many use it in this context. Later on, in a different comment, I remarked that "destructive" is a problematic term.
Yes, it is. Especially when one doesn’t separate the original data from the derivative.
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