How do I stop Lightroom 4 upsizing to print?

Started Jul 29, 2012 | Discussions thread
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How do I stop Lightroom 4 upsizing to print?
Jul 29, 2012

This is very basic probably, but I'm trying to print out a 100% crop that covers half a sheet of A4 paper.

So I've got the image, checked the pixel size in LR4 Library mode, cropped in Developer mode, rechecked in Library mode, and gone back and forth a few times until I have a crop with just enough pixels that will fit 210mm x 148mm (half of A4) at 270 dpi.
However whatever I do the print preview is filling the whole A4 sheet.

So it's either me getting pixels and DPI confused, or presumably there's a tickbox somewhere on LR that stops it upsizing to fit.

Can someone help me please, and whilst your at it I imagine there must be an easier way (other than hit and miss) to crop to a precise pixel size. How do I do that please?

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