Why 'more or less stopped using ISO'?

Started Feb 19, 2014 | Questions thread
D Cox Forum Pro • Posts: 18,621
Re: Why 'more or less stopped using ISO'?

xpatUSA wrote:

I would take the data in a "raw" file to include everything in the file, such as anything in the header that tells the raw converter to multiply all the numbers by some constant.

That would be your privilege.

At the risk of repeating myself, I said "raw data" which specifically means raw image data and nothing else. I did not say "data in a raw file" which means any data, including meta-data, headers, jpegs, image raw, checksums, the kitchen sink and whatever else you might want to add.

The problem with your concept is that if the header includes an instruction to multiply all the image numbers by 3, that is how they are intended to be read. The instruction is as much part of the raw data as the numbers it applies to.

Likewise the header includes the X and Y dimensions of the file. Without those numbers, the array cannot be displayed as an image.

For your restricted meaning, we should say "the data in the file body".

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