@igohigh - you need to set the render size in either inches or cm for changing the dpi to have any effect. 

Resolution when rendering is controlled by the total number of pixels in the image.

In the example screens you've posted, the image has the same resolution in both 11 & 12 - 640 x 480 pixels.

That number of pixels can be printed at either 8.888 x 6.666 inches at 72 dpi, or 2.133 x 1.6 inches at 300 dpi.

If you want to print at 8.888 x 6.666 inches at 300 dpi then you need to set that size in the render size dialog and let Poser figure out how many pixels are needed (it's 2666 x 2000, according to Photoshop).

So if you tell Poser what print size and resolution you need it will calculate the number of pixels needed to achieve that. 

If you tell it how many pixels you want you'll have to sort the print size and resolution yourself.

DPI is not rendered, only pixels are rendered.

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