benjaminbogaert Posted April 2, 2014 Share Posted April 2, 2014 So I searched the forum for similar threads regarding large print renders, but couldn't find my answer. I'm asked to do a render for a billboard that needs to be 2x3 meter. Translated at 100DPI that would be 11811 pixels wide and 7874 pixels high. This seems ridiculous high, and not sure my machine can handle this. I have quite a lot of vegetation but I managed to reduce it using vray proxy. I also know I can save RAM by saving the an Irradiance/lightcache map. But is this resolution correct or am I missing something? And any advice would be much appreciated. Thanks Link to comment Share on other sites More sharing options...
Zdravko Barisic Posted April 2, 2014 Share Posted April 2, 2014 Most of billboards, for street views, are printed in 30DPI. Yes, 30, not 300... ... But this is some inner billboard? Render region? ... http://www.scriptspot.com/3ds-max/scripts/mmregions Link to comment Share on other sites More sharing options...
benjaminbogaert Posted April 2, 2014 Author Share Posted April 2, 2014 Its for next to the road, on a plastic banner - I used billboard but I meant Banner. I like that region script, but isn't this standard available in Vray? 30 DP seems very small, but I'm more interested if the resolution is correct, I have been reading that even resolutions around 9k are more then find for large banners. Link to comment Share on other sites More sharing options...
Zdravko Barisic Posted April 2, 2014 Share Posted April 2, 2014 For 15-20m of viewing distance, 30DPI works just fine. How long is your distance view? Link to comment Share on other sites More sharing options...
benjaminbogaert Posted April 2, 2014 Author Share Posted April 2, 2014 I suspect 2-3 meter viewing distance, 5 top. Link to comment Share on other sites More sharing options...
marius e Posted April 2, 2014 Share Posted April 2, 2014 4000px 72dpi-100dpi would be perfect....done that plenty plenty times...but i suppose seeing is believing, so decide for yourself. Link to comment Share on other sites More sharing options...
benjaminbogaert Posted April 2, 2014 Author Share Posted April 2, 2014 4000px 72dpi-100dpi would be perfect....done that plenty plenty times...but i suppose seeing is believing, so decide for yourself. Thanks for the replies so far! It shouldn't be a problem then. I'l take 5000 width just to be on the safeside I guess, my biggest worry was this 10k+ render. Link to comment Share on other sites More sharing options...
RyderSK Posted April 2, 2014 Share Posted April 2, 2014 I agree, even 30DPI is more than enough. But if you want 100DPI, it doesn't mean you have to render 100DPI scaled of the same quality as your regular size. Just precompute all calculations at 1/4 (25DPI) and only final image at full res. Or scale it fractally in post (it works quite well, against popular opinion). Or some mixture. Like precompute at 1/4, render at 1/2 with NO FILTER (for sharp image) and than upscalle 200perc. fractally or even regular bilinear re-sampling. Link to comment Share on other sites More sharing options...
benjaminbogaert Posted April 2, 2014 Author Share Posted April 2, 2014 I agree, even 30DPI is more than enough. But if you want 100DPI, it doesn't mean you have to render 100DPI scaled of the same quality as your regular size. Just precompute all calculations at 1/4 (25DPI) and only final image at full res. Or scale it fractally in post (it works quite well, against popular opinion). Or some mixture. Like precompute at 1/4, render at 1/2 with NO FILTER (for sharp image) and than upscalle 200perc. fractally or even regular bilinear re-sampling. Juraj Ussualy I completely understand you, but you lost me at this one. Could you explain it in layman's terms. It seems that you are right, I'v been googling and some even say I can go as low as 12DP. So i'l stick with 30DPI, no need to waste extra time if it isn't necessary. Link to comment Share on other sites More sharing options...
marius e Posted April 2, 2014 Share Posted April 2, 2014 IMO sampling quality is the most important when it comes to larger prints, the better your sampling quality, the easier or better it will be when stretching the image... Link to comment Share on other sites More sharing options...
benjaminbogaert Posted April 2, 2014 Author Share Posted April 2, 2014 Well it's the first time i'm doing a large print like this, so i'l have to hope for the best. Thanks for your quick reply btw! Link to comment Share on other sites More sharing options...
Stephen Thomas Posted April 3, 2014 Share Posted April 3, 2014 11000px doesn't sound ridiculously high to me. Generally images are done at around 4500px, which will go up to A1 size at a push. So for a large banner print it's probably in the right area. Depends if your textures and 2d assets will hold up at that resolution though. I would be wary of dropping down any lower than 6000px though if I was you. Link to comment Share on other sites More sharing options...
marius e Posted April 3, 2014 Share Posted April 3, 2014 11000px doesn't sound ridiculously high to me. Generally images are done at around 4500px, which will go up to A1 size at a push. So for a large banner print it's probably in the right area. Depends if your textures and 2d assets will hold up at that resolution though. I would be wary of dropping down any lower than 6000px though if I was you. Totally not needed to render that size....you will be rendering for days at a time,if it even renders that is.. Link to comment Share on other sites More sharing options...
Scott Schroeder Posted April 3, 2014 Share Posted April 3, 2014 I recently did a job that had a print going up on the side of the building. The client insisted they needed the image at 300dpi and would not budge. I called the print shop, we had a good chuckle, and told the client that for that particular size of image they would print at 5dpi. You aren't going to be close enough to this image to warrant over printing the resolution. If you can, call the printers up. They'll tell you exactly how big of an image will work for that size and stop all of the guess work. Link to comment Share on other sites More sharing options...
benjaminbogaert Posted April 3, 2014 Author Share Posted April 3, 2014 I see, i'l contact the company who does the prints and i'l see! Thanks for giving me a general direction though. Link to comment Share on other sites More sharing options...
Justin Hunt Posted April 4, 2014 Share Posted April 4, 2014 If I had a $ for every time I've been asked to do a 300dpi render for a billboard I'd be able to buy you all a beer, and these are requests from the printers, then the ask for the files to be emailed. Sure I'll email you that 50meg jpeg, wait sorry you dont want a jpeg it must be a Tiff? Ok I'll email you the 1 gig tiff instead. The one case I was asked to produce an image 25 000 px wide in landscape, only to find out that they were cropping a tiny portion out as portrait, blowing that up to 25 000px wide and complaining that it was too blurry. Link to comment Share on other sites More sharing options...
RyderSK Posted April 4, 2014 Share Posted April 4, 2014 Sure I'll email you that 50meg jpeg, wait sorry you dont want a jpeg it must be a Tiff? Ok I'll email you the 1 gig tiff instead. :- D It's very funny to read these horror stories. I seem to be more lucky with educated clients although I had one magazine print where a bit clueless editor insisted for "hi-res" instead of "medium-res" image (which was already 6000px in height! Well over 300 PPI (/DPI). I just scaled that in PS and she vas very happy afterwards. She judged the size incorrectly because of opening it web mail client I presumed later but...as was mentioned, these people won't say no. I would have done the same with jpeg-to-tiff. Link to comment Share on other sites More sharing options...
Stephen Thomas Posted April 4, 2014 Share Posted April 4, 2014 Yeah, sometimes it's as easy as changing the dpi in Photoshop file to appease these people. Even thought the pixel count is the same Link to comment Share on other sites More sharing options...
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