I don't think an "a" is proper. Why would you think that? This would only be true if this were an acronym, and you in your industry say "header." But, from your follow-up post, you don't.
Unless everyone in the universe understand HDR whatever you said, but the common world would say H... D.... R..., in my opinion seeing that it isn't a common acronym. It's an initialism abbreviation. We would read it as an initiial abbreviation and say the letters. Similar to HDTV (initialism abbreviation, not an acronym), I would think the majority would say HDTV as the letters are, not "high defintion television." And therefore, the common world would say "an HDR," with no reason to think otherwise.
In other words, the indefinite article rule is based on the sound (Oxford dictionary definition for indefinite article "a" and "an."). If you expect everyone to read HDR as H... D... R...., then it's an "an." I don't think it's realistic for anyone to say, "header" or "high dynamic range." You mention something about acronyms not coming under the same rules. "HDR" looks like an initial abbreviation, not an acronym. If you say out the words that the acronym represents, then the indefinite article follows the sound of the words. If you say the letters, the indefinite article follows the sound of the letters. It's the sound that you say that matters.
I guess I didnt' read the rest, but if you say the name of the letter "H," then the indefinite article is "an." If you say a word that starts with the letter "h," and that "h" isn't silent, then the indefinite article can be "a."
To say "an historic" is perfectly acceptable because of the lightness of the "h" sound and phoenetically, "an is TOR ic " is a perfectly acceptable sounding term in the English language. In this particular thread, "an HDR" is correct; "A HDR" is not, assuming you don't say "header."
That all being said, I am fully willing to be crushed to wrongness by a true English teacher. Be warned, I grew up with two English professors as parents. This isn't the first time this has come up in my life.
Fred <~~~ IMO, of course (except for the English writing stuff)
Unless everyone in the universe understand HDR whatever you said, but the common world would say H... D.... R..., in my opinion seeing that it isn't a common acronym. It's an initialism abbreviation. We would read it as an initiial abbreviation and say the letters. Similar to HDTV (initialism abbreviation, not an acronym), I would think the majority would say HDTV as the letters are, not "high defintion television." And therefore, the common world would say "an HDR," with no reason to think otherwise.
In other words, the indefinite article rule is based on the sound (Oxford dictionary definition for indefinite article "a" and "an."). If you expect everyone to read HDR as H... D... R...., then it's an "an." I don't think it's realistic for anyone to say, "header" or "high dynamic range." You mention something about acronyms not coming under the same rules. "HDR" looks like an initial abbreviation, not an acronym. If you say out the words that the acronym represents, then the indefinite article follows the sound of the words. If you say the letters, the indefinite article follows the sound of the letters. It's the sound that you say that matters.
I guess I didnt' read the rest, but if you say the name of the letter "H," then the indefinite article is "an." If you say a word that starts with the letter "h," and that "h" isn't silent, then the indefinite article can be "a."
To say "an historic" is perfectly acceptable because of the lightness of the "h" sound and phoenetically, "an is TOR ic " is a perfectly acceptable sounding term in the English language. In this particular thread, "an HDR" is correct; "A HDR" is not, assuming you don't say "header."
That all being said, I am fully willing to be crushed to wrongness by a true English teacher. Be warned, I grew up with two English professors as parents. This isn't the first time this has come up in my life.
Fred <~~~ IMO, of course (except for the English writing stuff)
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