In some cases meta-data will be instructions on how to interpret the data.
Doug Franklin wrote:
>graywolf wrote:
>
>
>>I do not know exactly how PS uses the term, but -in general- "metadata"
>>is information about the data, usually saved in the file. That is all
>>the stuff in the file besides the actual photo -in this case- is
>>metadata. It seems to have started as a HTML keyword and spread into
>>other areas. Actual definition of "meta-" is beside, or after.
>>
>>
>
>You probably realize this, graywolf, but for the sake of the people that
>aren't computer professionals ... within the computer profession,
>especially software, the term "meta" has relatively specific meaning
>that's a little hard to put into comprehensible words. Basically, "Meta
>X" is "X about (the) X", so, for example, ...
>
>... a "meta language" is a language that describes other languages, or,
>alternatively, and maybe more properly, a language that describes the
>properties of languages.
>
>... "meta data" is "data about (the) data". So in the case of photo
>files, that would include comments, EXIF data, IPTC data, and
>technically it could be considered also to include such "intrinsic"
>information as the length, width, and pixel data size/format.
>
>
>
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