Render in Zbrush, how do I change dpi output?

[system]

I’ve looked around and have still found no answers to how to change the dpi output of renders out of Zbrush. It seems like an easy thing, and I feel stupid that I have not figured this one out yet. Why have an image that is 2048 x 2048 if your dpi is still 72? I am using Zbrush with a model that was extracted from a volume which makes it almost impossible to work with in max or maya, due to its density. So rendering our in Zbrush is my best option, if i can change the dpi output. Any help or advice otherwise would be great. Thanks. :qu:

[system]

It seems you have misunderstood something about dpi. Maybe I just misunderstand you…

20482048 px in 72 dpi, is just the same as 20482048 in 300 dpi.
Dpi (dots per inch) is only something you use to tell i.e a printer how big the picture will be in lengt/width measures. 2048*2048 in 300 dpi will simply come out smaller on the paper than if it had been in 72 dpi, because more pixels is drawn per inch. But you have the same amount of px. total.

Sorry if I totally misunderstand something about your probelm…

[sigung]

dWhile Kragh is right in what he said, I perceive that there is another underlying problem that you are trying to resolve. Speaking as the former production manager of one of the biggest large format graphics companies in Portland, OR (now happily self employed as a 3D artist) I can tell you that the relationship between size, resolution, and final output size is one that befuddles many people, so you are not alone.

If I am correct, you may be trying to get a decent printout at a decent size. A 2048x2048 file @ 72 dpi will give you a decent print that is 6.827"x6.827". If you try to make the print size larger, then the resolution will drop proportionally and the final quality will be poorer. Lets say you wanted to make that 6.827"x6.827" print out at 24"x24", well then, you would have to output your file from ZBrush at 7200x7200 pixels to get a file that was 300 dpi at 24"x24" The way you figure it is this: First determine what the requirements are of the final output device you are using. Let's say you wanted to do a super high, photographic quality print, using a Lightjet 5000. This is an RGB device that prints directly from a file to photographic paper using Red, Green and Blue lasers, and needs a native file to be 300 dpi at the final desired output size, in our example, lets say 24 inches by 24 inches. Secondly, open your file in photoshop, and set the image resolution to 300 dpi, in this case, a 2048x2048 will have an image size of 6.827 inches if you change the dpi setting to 300 WITHOUT the resampling box checked. Divide the desired size, 24 inches by your present image size, 6.827, which will yield the result of 3.515. Multiply your current image pixel dimensions, 2048, by this number. This will give you a pixel dimension of 7199.648, round it up to 7200. Okay, now you know what pixel dimension you need to render with in ZBrush to get the proper resolution for your final output size of 24" x 24". Mathematically, if ZBrush sticks to the 72 dpi standard, this new render will open in Photoshop at a size of 100 inches by 100 inches. If you resize it to 24 inches WITHOUT resampling the image, the resolution will change to 300 dpi in the resolution area of the image size box, telling you that you have adequate resolution at your print size of 24x24 to achieve a high quality final print. Now can somebody PLEASE tell me how to get a decent render out of ZBrush?? Everything I render is pixelated at the edges, no matter how I set the antialiasing or quality. I want to export an image as a PSD or TIF file that has nice clean antialiased edges, not this pixely crap I keep on getting..