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<div dir="ltr">---------- Forwarded message ----------<br><div class="gmail_quote">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 5:47 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 5:13 PM, Kennedy, Smith (Wireless Architect) <<a href="mailto:smith.kennedy@hp.com">smith.kennedy@hp.com</a>> wrote:<br>
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> Ah, so it is the difference between the input document format content resolution and the resolution the Printer or language interpreter should use for the output. I can see how that might be useful for vector formats because that might factor into the output speed or marking agent usage.<br>
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> But for raster document formats, if you send a lower resolution, upscaling cannot "create" information, so you would still end up with the source resolution, right? (I'll discuss this with our language interpreter / color science people...)<br>
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</span>You can't make the equivalent of vector quality, no, but "resolution enhancement technology" has been a staple of laser printers for years to improve the effective resolution when printing. Also, most printers do not produce 255 different sizes of dots so you "lose" some resolution in the printer due to dithering/halftoning.<br>
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As far as edge detail you can see a greater improvement between 300 and 600 DPI than (say) 600 and 1200 DPI thanks to the limits of visual acuity - at that point the dots are so small you are better off using the higher resolution to improve shading/dithering than getting a smoother looking line/character. Thus, the document resolution can be 600DPI while the output resolution is a much higher resolution.<br>
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Michael Sweet, Senior Printing System Engineer<br>
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