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In the New file dialog, enter the physical dimensions (inches or cm) and the required ppi for printing, and Photoshop will do the math for you and create a file with the correct pixel dimensions.
The forumula is Pixel dimensions divided by ppi = Dimensions in inches
For instance 3000 (pixels) : 300 (ppi) = 10 (inches)
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The resolution of your images should be around 300 PPI.
You may (or may not, depending on what you're after) need to consider the size of paper you'll be printing on.
So, if you are printing on say a 10" x 8" sheet and you want say a 1/4" margin around four pictures (2 x2 in this example).
You set your document to 300 x 10" = 3000px x 8" x 300 = 2400px.
Three margins 75px for the two outer and 76px for the centre minus 2400 leaves 2016px for the image width divided by two means the images should be 1087px wide each.
I'll leave you to calculate the depth!
Thanks very much Derek, excellent advice, I'll give those instructions a go and see how it pans out for me.
Thanks Per, think that will work for me now, cheers.