Quote - *Ok that link has baffled me even further, I have been trying to understand this for months now!

All I want to do is print any picture in as much quality as possible on my printer which is a very nice 8 ink canon with A3 capability.

My understanding is set size of image  to 4950 x 7020 and don't move the default setting of 72 dpi/ppi thing at all. 

I will then be able to print my image on A3 with no quality loss/resizing etc?

This image will automatically now print at 300 dpi ( dots per inch ) and it does not matter that i didn't move the default 72 to 300.

Am I right >?*

Correct, mostly :)

The image won't "automatically print" at that size...it's got enough pixels to ensure it prints in high quality, at A3 size.

You can set a printer's DPI to various amounts, but for optimal results, it's 300 DPi, but don't worry about that, the printer knows what the hell it's doing ;)
So ignore the printer, as long as it gets enough pixels per inch it's to print, it's happy.

sorry it's not easy I know :)

Just go with this mantra:

You need 300 pixels per inch of printed size to get a good printed image

So if you want a print 10" by 10" inch, make it 3000 x 3000 pixels in render size. you can find the inch sizes of A3, A4 etc easily on wikipedia, from that, you can work out sizes

Note that big renders = long time and large memory requirements.
Hence many folk render at a fraction of the size and use Photoshop to scale the image up.
to save time, a person wanting a 10" x10" inche render, needs 3000 x 3000 pixel image, so he decides ot render it at half the size to save time, eh takes his 1500x1500 half sized render into Photoshop, enlarges it up to 3000 x 3000 and then prints it.

That's not ideal, enlarging isn't as detailed as a pure render but it's a DAMN sight faster, and if the render is sufficiently large, you won't loose too much detailed in blowing it up.
The best "enlarger" is a thing cllled "Genuine Fractals" expensive but it is very good and used by many render artists.

The printer or print shop MUST get a an image with an assload of pixels to make sure the picture looks detailed and non-blotchy.
:)

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