What’s the best way to ensure a 300 DPI image will be printed at 300 DPI?
For example, if I were using InDesign with a document DPI set at 300 DPI, then inserted an image that is 900px X 450px with a DPI property of 300, then the image would have a dimension of 3in x 1.5in automatically. I don’t ever set any dimensions on the image because InDesign understands that it is a 300 DPI document and also will scale accordingly based on the images DPI property(which is just a file property).
If I take that same 300 DPI image and insert it into PlanetPress Connect, it appears to be using 96 DPI and so the image size will be 9.375in x 4.688in. I can use CSS to resize the image down to 3in x 1.5in but I’m worried about the size being a pixel off when my images aren’t an exact multiple, say for example my image is 902px wide, then the size is a repeating decimal: 3.006666 in. This is what’s ideal about not specifying dimensions, and instead specifying document DPI and letting the publishing software determine the appropriate dimension of the image to ensure there’s no resampling/interpolation of pixels.
Looking through manual of other versions of Planet Press, there were image DPI settings under the Resources options so you could tell it to treat color images as 300 DPI. I don’t see any of those settings in PlanetPress Connect.