Lightroom export 'px per inch' settings for Photobox Poster prints...?

theMusicMan

theMusicMan

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Hi All

Just about to send off my last batch of poster prints for this excellent offer from Photobox, but have spotted a setting in Lightroom that I need advice on please.

When I export, I get a dialogue box where one setting is the Resolution - in pixels per inch.

What should this be for optimum printing for the 30" x 20" poster prints please...?

Thanks
 
300 dpi . Although, from your camera, if you printed at 300dpi you'd get a 12x8" print so it is interpolated up to 30x20".
Probably best done this end by you in genuine fractals or photoshop by going up 10% at a time to the correct size.

Someone will now come and tell me that Photobox will do the interpolation to bigger than 12X8 at that end!!! :D:lol:
 
direct from photobox website

For those that are technically minded, here is some information about our print devices and paper types. For small format work (up to 10"x15") we print on a number of FujiFilm Frontier 370 and 390 printers. These work by exposing red, green and blue laser light onto FujiFilm Crystal Archive photographic paper at 300 DPI (dots per inch). The fade resistance of the prints is rated at 150 years.

For large format work we use a Polielectronica Laserlab. This is a world-class laser-based photographic device which prints onto FujiFilm Professional digital photographic paper at 254 DPI. The fade resistance of the prints is also rated at 150 years.


so

upto 15x10" 300dpi

over 15x10" 254dpi
 
WOW - you guys and gals are top notch, thanks very much.
 
Changing the PPI value in LR will have no impact on the quality of the print, the only purpose it serves it to allow software to calculate what the "native size" the image should be. If you have an image that is 3000x2000 pixels and the PPI value is 300 then s/w that uses the value will assume it should be 10x6.667" in size. Change the PPI to 100 then the s/w will think it's 30x20".

The photobox guidelines aren't telling you what PPI value to set but how to calculate the pixel resolution needed for the best quality print. So a 15x10" print at 254PPI need a pixel resolution of 4500x3000 @ 300 PPI or 3810x2540 @ 254 PPI
 
pxl8 said:
So a 15x10" print at 254PPI need a pixel resolution of 4500x3000 @ 300 PPI or 3810x2540 @ 254 PPI
Click to expand...

So a 15x10" print would need a pixel resolution of 4500x3000 @ 300 PPI or 3810x2540 @ 254 PPI


Apart from that bit it all made perfect sense :)
 
RobertP said:
So a 15x10" print would need a pixel resolution of 4500x3000 @ 300 PPI or 3810x2540 @ 254 PPI


Apart from that bit it all made perfect sense :)
Click to expand...

Nah, needS works too :D
 
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