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<div dir="ltr"><br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Michael Sweet</b> <span dir="ltr"><<a href="mailto:msweet@apple.com">msweet@apple.com</a>></span><br>Date: Wed, Jul 13, 2016 at 5:02 PM<br>Subject: Re: Value of "printer-resolution" | "printer-resolution-supported" vs. the "pwg-raster-resolution-supported"?<br>To: Smith Kennedy <<a href="mailto:smith.kennedy@hp.com">smith.kennedy@hp.com</a>><br>Cc: Ira McDonald <<a href="mailto:blueroofmusic@gmail.com">blueroofmusic@gmail.com</a>><br><br><br>Smith,<br>
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> On Jul 13, 2016, at 4:00 PM, Kennedy, Smith (Wireless Architect) <<a href="mailto:smith.kennedy@hp.com">smith.kennedy@hp.com</a>> wrote:<br>
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> Hi there,<br>
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> What again is the value of "printer-resolution" and "printer-resolution-supported" vs. the document format specific attributes that seem to specify the same information ("pwg-raster-resolution-supported", etc.)? I know that "printer-resolution" | "printer-resolution-supported" were defined in RFC 2911 but I'm trying to explain their value to some folks here and I'm at a loss.<br>
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</span>printer-resolution specifies the output resolution. For example, a printer that supports 4800x1200dpi can allow that resolution to be selected for higher quality output.<br>
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pwg-raster-resolution-supported specifies supported document resolutions, which are typically some integer divisor of the printer-resolution-supported values. For example, that same printer might advertise 300dpi and 600dpi PWG Raster resolutions, which are upscaled to 4800x1200dpi (or whatever printer resolution is in use).<br>
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Having a lower document resolution allows for faster transfer (and less processing on the printer overall) while still supporting high resolution output. And typically you are getting RGB or grayscale data that needs to be converted to the device color space, dithered, etc.<br>
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Michael Sweet, Senior Printing System Engineer<br>
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