suggestions for printing 24 and 16 MP photos


Conqueror

Link Posted 10/11/2017 - 19:14
Hi,

Just wondered what print size worked well for 24 and 16 MP photos.

Looking to get some printed soon. Was planning to get prints done online and get frames separately myself.

Should I be aiming for 300dpi? (or can I sensibly sacrifice a small amount?)

What size have you typically gone for?

I think 13" x 24" comes out at 300 dpi for 24MP, but I dont recall seeing the option to print at that size.

I'm hoping to go reasonably large.

thanks
K-3ii

McGregNi

Link Posted 10/11/2017 - 19:42
I have had a number of large 'poster prints' done by this online service, FOTO.com ... link

These have been around 24 x 35in, with very high quality, in fact really indistinguishable from 7x5 prints even when looked at closely. And this is from the 14.5 mpx K7!!

You don't need to worry about the print resolution frankly .... just upload to them a 'max quality' jpeg, at full size, their software sorts it all out anyway. If there is any upscaling or interpolation involved then it is pretty damn good! I doubt you need 300ppi files for wall prints anyway, I'd have thought 200 was OK, but as I said if you're relying on an online service just let them worry about it.
My Guides to the Pentax Digital Camera Flash Lighting System : Download here from the PentaxForums Homepage Article .... link
Pentax K7 with BG-4 Grip / Samyang 14mm f2.8 ED AS IF UMC / DA18-55mm f3.5-5.6 AL WR / SMC A28mm f2.8 / D FA 28-105mm / SMC F35-70 f3.5-4.5 / SMC A50mm f1.7 / Tamron AF70-300mm f4-5.6 Di LD macro / SMC M75-150mm f4.0 / Tamron Adaptall (CT-135) 135mm f2.8 / Asahi Takumar-A 2X tele-converter / Pentax AF-540FGZ (I & II) Flashes / Cactus RF60/X Flashes & V6/V6II Transceiver
Last Edited by McGregNi on 10/11/2017 - 19:45

johnriley

Link Posted 11/11/2017 - 00:22
The standard resolution would be 300ppi for the best quality. You should have no problem getting superb A3 prints, even larger if you want to, with either camera. I always resize the images to exactly the size required for the print. So, for example, I get 18" x 12" prints from Costco and resize my images to that, at 300ppi as mentioned.
Best regards, John

McGregNi

Link Posted 11/11/2017 - 15:30
Oh no, that's two fairly contradictory replies ..... is it John vs Nigel ?

No, I think they are two different approaches based on experiences, but also it depends on the type of printing service you are dealing with. I would say that John's approach, to resize and prepare the file specifically tailored to the print, is ideal for when you're doing the printing yourself (obviously), or if you are dealing directly with the Printer and can communicate, check on things and confirm in your mind the best requirements that match their needs.

In my case, the approach is based on Online services that are mainly automated (although for the large prints there would be a human operator overseeing things), but most of the digital work would be automated. Their software is going to mess around with your file anyway, regardless of the size you send it at, and most likely for enlargements then there is going to be automated interpolation and a custom resolution based on the print size and how much digital data was supplied to them. So I think its best not to do anything before this that might interfere with quality ..... just give them the most data you can in the jpeg format.

The only real penalty with this approach is that you are likely to lose a little around the edges to cropping, in order to scale and fit your image into the specific print output dimensions they offer. I have found that it is very unlikely that this will matter to any photos ..... we mostly can lose a little more around each edge on our shots without it being a problem. Its a good reason to shoot a little wide if you remember. You can usually see this small cropping applied on the thumbnails as you are setting up your order.

I think also that the printing service is likely to have far better sophisticated upscaling software in use than what we could do ourselves, without becoming real experts and buying a specialised programme.
My Guides to the Pentax Digital Camera Flash Lighting System : Download here from the PentaxForums Homepage Article .... link
Pentax K7 with BG-4 Grip / Samyang 14mm f2.8 ED AS IF UMC / DA18-55mm f3.5-5.6 AL WR / SMC A28mm f2.8 / D FA 28-105mm / SMC F35-70 f3.5-4.5 / SMC A50mm f1.7 / Tamron AF70-300mm f4-5.6 Di LD macro / SMC M75-150mm f4.0 / Tamron Adaptall (CT-135) 135mm f2.8 / Asahi Takumar-A 2X tele-converter / Pentax AF-540FGZ (I & II) Flashes / Cactus RF60/X Flashes & V6/V6II Transceiver
Last Edited by McGregNi on 11/11/2017 - 15:34

Chrism8

Link Posted 11/11/2017 - 16:00
McGregNi wrote:
I have had a number of large 'poster prints' done by this online service, FOTO.com ... link

These have been around 24 x 35in, with very high quality, in fact really indistinguishable from 7x5 prints even when looked at closely. And this is from the 14.5 mpx K7!!

You don't need to worry about the print resolution frankly .... just upload to them a 'max quality' jpeg, at full size, their software sorts it all out anyway. If there is any upscaling or interpolation involved then it is pretty damn good! I doubt you need 300ppi files for wall prints anyway, I'd have thought 200 was OK, but as I said if you're relying on an online service just let them worry about it.

I agree with this, I've had 48 x 36 printed by these guys and agree with Nigel's comment's, let the Lab sort it, costs are good, quality excellent and the turna round about 5 days, they come delivered in a good sized cardboard tube.
Chris

www.chrismillsphotography.co.uk

" A Hangover is something that occupies the Head you neglected to use the night before".

-------------------------------------------------------------
K1 - Sigma 85mm F1.4, Pentax 150 -450 F4.5 / 5.6, Pentax FA 24 - 70 F2.8

Sigma 100-300 F4, Samyang 14mm F2.8, Sigma 70-200 F2.8,

K5iis - Sigma 17 - 70 F2.8, Sigma 70 - 300 F3.5/F5.6, Sigma 18 - 200 F3.6 / F4.5.
Last Edited by Chrism8 on 11/11/2017 - 16:01

JAK

Link Posted 11/11/2017 - 21:30
These days I wouldn't think about resizing them and changing the DPI will make no difference. It did at one time with really old software that couldn't cope with dynamic resizing. I'd hope all printing houses have moved on from the 1980's! For large prints submit the highest resolution files you have for the best results. That even applies to home photo printing too unless the printer and its driver software is ancient (eg Commodore 64 / Spectrum era when it did help.)
John K
Last Edited by JAK on 11/11/2017 - 21:35
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