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Never thought about that. Always wrote it all uppercase because that’s what camera maker Canon consistently does from what I’ve seen.

If I search for Canon raw on Google the Canon owned websites that I see writes it all uppercase; RAW.

One of their pages that I find even makes note of that:

> The letters RAW do not stand for anything – it's just a convention that RAW is usually written in capital letters – and the names of RAW files from Canon cameras do not end in .RAW.

https://www.canon-europe.com/pro/infobank/image-file-types/

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I'd expect a cause is that most camera makers are Japanese, and it's not uncommon in Japan to uppercase words written in Latin alphabet for aesthetic reasons
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Very plausible, I haven’t considered it.

Perhaps the combination of that and the old .raw filename extensions on old filesystem implementations where everything appears uppercase (since camera firmware is slower to catch up, this persisted for years even though contemporary OS already had no such limitation) made it stick.

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I can only recommend to consult more trustworthy sources.
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Its hard to get anyone not to capitalise three letter words and best to just have a longer product name.
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Funny, I've been shooting digitally since 2007 and I've never seen RAW spelled other than RAW. I guess we've been doing it all wrong :shrug:
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To be fair, it's essentially de facto convention at this point in the ecosystem, regardless of what's "right" or "correct". No one is gonna bat an eye regardless if you write RAW or raw either.
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I saw it used both ways. My question about which one is right was answered as soon as I bothered to look up what it is, which I did when I got interested in raw photography.
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RAW gets all caps the same way TXT, JPG, CMD, SH, BAT, and etc. get all caps. That is, you are also perfectly free to say raw files, text files, JPEG files, command files, shell scripts, and batch scripts, or .txt files, .jpg files, .cmd files, .sh scripts, and .bat scripts, and not everyone uses the same convention (or even consistently a single one).
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