Question, when shooting (did a basketball camp pic this morning) with my R6 mk2, using 24-70 lens, my pics when trying to print an 12x18 poster come out a little blurry. In other words, the pics are great straight from the camera but when printing a 12x18 poster , they are not. The printing press people tell me that the pics are 350 DPI and are 2.25" by 1.5" resulting in an distorted pic when trying to print. Never had this problem with my original R6 or my other Canons. Sounds like the cropping aspect is wrong or something. Help!
UPDATE: Found the problem..I used a post processing program to write to a thumb drive and to save space, an option was set to compress, thus the distorted pic when blown up.
Did you send them a reduced size export? 350 dpi at 2.25” is only 788 pixels wide, which is a massive size reduction from your R6 II’s native output size.
This sounds like a post-processing and export issue, not a camera issue. 12x18" @ 300 ppi is 3600x5400 which is less than the native resolution of your camera assuming you have it set to raw or large jpg. The DPI field on an output dialog doesn't mean much. The actual pixel dimensions do.
I have printed that size from a 24 MP camera a bunch of times. The camera has enough resolution. If you have the RAW files (or even the original large jpg files) you ought to be able to reprocess them and get that size prints. Just make sure when you process the files the way you want you don't downsize.
If the place you are using can't make good prints from those full size files, then find somebody who can or even print them yourself. It isn't that hard.
