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Thread: Rendering Large Format Images

  1. #1
    Moderator cellophane's Avatar
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    Rendering Large Format Images

    I've got a couple images I need to put together for job site signs and am not sure what the best method to get them done is (excluding Max or other 3rd party rendering options.) The final images on the sign will be about 6'-0" wide and 5'-0" high. I know I can change the size of the view crop region and make it that size but the renderings take absolutely forever if I do.

    Is there a faster method to get the large format without tying up a PC for 2 days? I'm using the Raytracer in 2016

  2. #2
    Moderator snowyweston's Avatar
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    Upsampling, or whatever it's called, in a graphics editor should get you some way toward the size.

    From my (albeit limited) understanding of repographics there are other tricks (fractal processing, dithering, etc) to "enlarge" source media to larger-than-average outputs - that and you'd not typically (need to) be aiming at 1200dpi pixel-perfect - so there's no actual need to make your view match the physical output size 6'x5' (since you'll be rendering detail only perceivable when you zoom), purely the aspect ratio.

    As an example, I once printed 300dpi scans of 6"x4" (printed) photos to A1 (841x594, sorry, mixing units!) and from a sensible viewing distance they were "photo quality" - even if on (closer) inspection they were pixellated all over the show.

    You printing these in house or taking them to a shop? If the latter, I'd talk it through with the people there - send them a file (of a render that doesn't take an unreasonable amount of time to complete) then ask for a small sample print to gauge the quality.

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    Moderator cellophane's Avatar
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    Thanks.
    They are being printed by the contractor, presumably at a print shop although I don't know who. I'll see if I can get a hold of the printer and talk to them.

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    Forum Addict GMcDowellJr's Avatar
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    I agree with Snowy. Distance impacts perceived resolution. Billboards, for example, are surprisingly low-res (50 dpi) but you can't tell from the highway.

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    Member TheRevitKid's Avatar
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    Hey Cellophane... I would get a recommended DPI from their printer and work backwards...

    If they say they recommend 75 DPI for that size image (based on distance and size that doesn't sounds crazy to me). You can render an image at 300 DPI and 4 times SMALLER in actual size then the printed version.

    Then, when you (or they) blow it up in post processing it will drop from 300DPI to 75DPI...

    Give or take... I don't know the exact math but that is the method I have used in the past.

    In the attached image notice the image size in Revit and then the new image size in Photoshop when dropped to 96 DPI (from 300)....

    I hope that helps a bit!!

    Rendering Large Format Images-dpi-1.jpgRendering Large Format Images-dpi-2.jpg

  6. #6
    Moderator cellophane's Avatar
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    Thanks!
    TheRevitKid likes this.

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