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10-19-2011, 10:40 PM   #16
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QuoteOriginally posted by woodyneale Quote
where picas and points measured font size and line spacing, i.e. 12 points equalling a pica and 6 picas one inch: as stated “all history now”.
Not so, these are still used in the typesetting and layout industry. Every newspaper that is created in today's page layout programs such as Quark Express or Adobe InDesign is still using these. (And a lot of others that were use when papers/magazines were composited on the old Linotype machines.) The term "cut and past", "leading", "gutters" and "greeking" among others have their origin when compositors from way back when were laying out type and pages manually.

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10-19-2011, 10:42 PM   #17
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QuoteOriginally posted by woodyneale Quote
Thanks for all your comments and links guys, itís much appreciated. Iíve had a far broader response than expected to aid my understanding.

For me this begs one question ďwhy does a dpi factor even get included in exif data?Ē
It's relevant for scanned images, which do have an an actual size in inches, and hence an actual dpi.

QuoteQuote:
One thing that I think would more useful is knowing how many linear pixels a camera sensor has per inch or mm along its x/y axisís as it could give a more realistic comparison of the capturing image resolution between camera models. After all, what is the actual size of a pixel on any given sensor?
How would that be relevant? If the image is 1000 pixels wide, what different would it make if the sensor that captured the image was 1 inch wide or 6 inches wide? If you want to know aout resolution, the pixel count tells you everything you need to know.
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