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render resolution question

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Alpha2:
I'm working on a project that requires me to edit rendered Anima8or images for a printed book, but the generally held rule is that 300 DPI (or in some cases pixels per inch) is the minimum size for a decent print of a non anti-aliased image (which it needs to be for editing purposes since aliased images aren't as sharp). The Problem is every large render I do seems to read below 300 in Photoshop (254 to be exact.) I'd really like the images to be as sharp as they can and raising the resolution after the rendering will just end up hurting the sharpness.

Is there any way to up the resolution of the file output from 254 to 300?

(I know some people say PPI is not DPI but to be on the safe side I've always kept PS files set to that res. to avoid the issue entirely with clients.)

selden:
You can use an image manipulation tool to change the DPI specified in the image file to whatever you want without changing the number of pixels in the image file.  I've used Irfanview to do this. I'm sure other programs can do it, too.

You do have to make sure you render the image at a size that you know will include the right number of pixels. e.g. if you want it to be 5" x 8"  on a 300dpi page, render it to be 1500x2400 pixels.

(I assume you're aware that rendering an image at 2x the final image size and then downscaling it usually produces a better quality final result than rendering at the final resolution.)

Alpha2:
No I realize that, but let me see if I can describe the confusion I'm running into...

Lets say I'm working on a comic book. The finished size of a page is (very) roughly about 2100 x 3070 for a 7x10" image at 300 dpi
If I produce a similar image on Anim8or with the same dimensions I get an image that fits the page layout, but at 254.

I wanted to know is there anyway to change the resolution so it just gives me 300 without having to alter the size of the image itself. I ask mostly because the 254 seems like a strange number to land on without a reference for why the program chooses that I'm used to programs like Illustrator or Photoshop that just automatically give you control over the numbers from the outset. Sure, I might be able to squeeze 300 out of the image through resizing but I've run into issues with pixel blurring in the past when clients supply me with sub print quality images which makes me gun shy about using that method and potentially wasting time. It's not so much that I don't want to do the math as it is I'd like to try and remove steps that leave room for error.

slex:
Anim8or has a limit of maximum 4096x4096pixels per picture with default 300x300 DPI so that shouldn't be an issue. 
Just be sure to save image as .png file with 100% quality, not as the default .bmp- maybe that makes the problem.

see attached example, can you use it properly as you said?

Alpha2:
Slex, Actually your PNG comes up in photoshop as 72 pixels per inch. ??? ???

Is this in .98? I use mostly .95 because it crashes on me a lot less. though I guess I could use it for still renders if I can control the resolution the way I'm hoping to.

Edit:// just checked .98 didn't see an option for PNG. is there a trick to doing that? I haven't been around the forums in a while.

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