How do I force a render to be output at a specific DPI for a predetermined render size. For instance, if I want my render to be 1920 x 1080 at 300 DPI which menus do I use to get that resolution?
By default 1920 x 1080 is just that for pixel count of the image. The resulting dpi will be determined by how big a piece of paper you print the image on.
I am going to guess you are printing out a poster size, large format image and would like it to be a 16:9 aspect ratio.
If that is the case just multiply your desired dots per inch (300) by the final printed image size (inches) and use that for your Custom Image size (pixels) in the PV360 settings.
Give us more detail on what you are trying to do and we can show you a screen shot or two on how to set that up in PV360.
In truth, those were just arbitrary numbers. For most of my work, I won't go bigger than 11 x 14 (inches) at 300 dpi. So using your instructions in your post: 11 inches x 300 dpi = 3300 pixels, and 14 inches x 300 dpi = 4200 pixels. The resultant image would be 1.26 megapixels big. Can that be correct? Seems way too small.
I am used to seeing the photoshop menu where you specify the specify the image size in x pixels by y pixels at a certain dpi.
EG, 640 x 480 at 300 dpi.
what am I missing?
3300 x 4200 is a 13,860,000 pixel image.
What I laid out for calculations is how you need to work it in PV360. The control for DPI is not exposed in PV360.
I think I understand this now. The size of the image in pixels is determined by how what settings you select in the PV360, or any render engine for that matter. How an output device takes that those pixels and uses them is a function of the dpi setting in the controls of the printing software; E.G. Photoshop.....
The higher the dpi, the closer the output device will pack the available pixels into a given area and vice versa. Regardless of dpi, the number of pixels available to the output device is fixed by the render engine.
I made up this chart as a quick reference to know how big an image to create for the end size/dpi I was looking for...
Thank you very much for sharing that chart. How did you do the arithmetic? Did you have to know physical pixel sizes?
Divide the image size in pixels, height and width, by the dpi to get inches.
640/300 x 480/300
2.13 inches x 1.6 inches
Attached is the speadsheet with the equations. You can expand it out to bigger sizes or different image ratios if you like.
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