prinitng to a2

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c_robinson

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charlie robinson
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Just a quickie, had an order for a shot earlier in the year.

i'm going to be printing through photobox (my preferred printer, never had anything but good experiences)

the image is 3504px x 2336 px @ 72 DPI.

will this be ok to print to a2, it's sharp enough @ 100% for me but it's an important client and i want it to be 100% right and not have to keep the first and upload a different spec of the same image.

Regards
Charlie

Mods: sorry couldn't work out where to post this! please move if required
 
72 dpi is way to low.Only really used for web display on a monitor.

Ideally you should be looking for 300dpi
 
First your size is 3504px x 2336 px (forget the 72 it has no bearing here)
You’re talking of printing it at 16 x 23 ins
so this will make your image 150 pix per ins
You can print at this res because you will be viewing for a distance that will be more then an A4 print.
If you wanted to you can upsize it in Photoshop but check out what it looks like
Try and print a small part of it on A4 and see what you think.
 
Hi Chaz

I'm not that up printing so dont really understand why its still not 72dpi as I thought this was still dots per inch no matter what sizes the print is???
 
the 72dpi is only what your screen will show it at any photo has only the pixels i.e. your is 3504 x 2336 nothing else the only time your use dpi is when you output it to screen or printer then the dpi will determine it size on that output
So if you was to print it what ever dpi you set you divide the pix by this and it gives you its size
if you want a 20ins print at 300 dpi then the image will need to have 20 X 300 = 6000 pix but if you not got that let say its your image then you will divide 3504/20 =175.2 dpi
Hope this helps
 
I don't think you will not have any problems.

I have been sending Photobox files from my 40D (3888x2592) to print at A2 and they are stunning.

I think the printer they use interpolates to around 145dpi when it prints regardless of how small the file is. There are details on the website if you delve a bit.

If there is enough detail to start with you will be OK.

Regards

David
 
how about some basic maths here guys
i realise the 72 dpi on screens and the setting of 300 dpi for prints..ideally

how does that all relate to the pic size on the card...mine are 2288x1520 pixels out of the camera...are pixels also called dots
 
mrcrow said:
how about some basic maths here guys
i realise the 72 dpi on screens and the setting of 300 dpi for prints..ideally

how does that all relate to the pic size on the card...mine are 2288x1520 pixels out of the camera...are pixels also called dots
Click to expand...

In a word Yes
One is for printing and one for screen
Ink Dots - Screen Pixel
Both get mixed up ie DPI and PPI
 
Chaz Photos said:
In a word Yes
One is for printing and one for screen
Ink Dots - Screen Pixel
Both get mixed up ie DPI and PPI
Click to expand...

thanks chaz...i have now got used to setting the crop on my ps2 for 300 and dimensions 6x4in...i never realised the relationship
now my snaps are a bit better...i used to crop a lot...but the constraint keeps me in good printing criteria

back to the larger print...what would be a good dpi for larger prints..A4 A3 etc as i am going to buy a 10-12 Mp boy racer...probably with a 1/2.3 sensor and would like to maybe do some large prints of the grandchildren
cheers
geof
 
mrcrow said:
back to the larger print...what would be a good dpi for larger prints..A4 A3 etc as i am going to buy a 10-12 Mp boy racer
Click to expand...
Assuming that you're looking at prints from a sensible distance - the usual rule of thumb is that you don't want/need to be closer than a distance equal to the diagonal of the picture - then you can print any size you like with 10-12 MP. In fact you can do it with only 6 MP.

This might sound counter-intuitive, but it isn't really. The larger the print, the further away you need to stand in order to see it properly, and therefore the lower resolution you can get away with.
 
I've had prints 20" from my D2Hs - and that's only 4.5 MP - no problem at all - they look great!
 
mrcrow said:
how about some basic maths here guys
i realise the 72 dpi on screens
Click to expand...

Not really. 72 dpi used to be a good guess at most screen resolutions - about 20 years ago! Nowadays you're much more likely to be using a screen that's 90 dpi or more (the one I'm currently using is 133 dpi).

mrcrow said:
how does that all relate to the pic size on the card...mine are 2288x1520 pixels out of the camera
Click to expand...

And, until you print the image those are the only numbers that are relevant. The dpi value attached to your images is meaningless. The reason it's set at 72 dpi is because the exif standard (exif is the format of the metadata in the file) recommends that, if dpi is unknown or irrelevant, that field should be given the value of 72 rather than being zero or blank.

mrcrow said:
are pixels also called dots
Click to expand...

Not really. Your printer will produce dots, commonly at very high resolutions like 1440 dpi. It uses several dots to recreate one pixel. So, strictly, one should be talking about pixels per inch.

However, what you really want to know is 'how large can I print my image?' As Stuart has said - that depends on how far away the viewer will be. Have you ever had a close look at a billboard photo? That's nowhere near 300 dpi - but it looks OK because its viewed from a distance.

The more pixels in your image the better a print will look. But I've printed images about the same size (in pixels) as yours and they look fine. Indeed, one of them graces one of our corporate walls.
 
awp said:
I've had prints 20" from my D2Hs - and that's only 4.5 MP - no problem at all - they look great!
Click to expand...

a light in the tunnel and perhaps a saviour for my 4.2 olympus
:thumbs:

i am going to shoot a tripod shot of a landscape and see if it comes out ok at A3
this means i should view at around... hypotenuse of 12x16?

this is thrilling i thought i would have to go up to a mega big camera to get some wall shots

thanks

gulp!!!what does nikon charge for more Mp

hmmm!

Forget the D300... if you want a workhorse of a camera but can't afford £3,000 for the D3 - you want a D2Hs. It can rattle off 8fps, it is built like a tank [unlike the D300], and there really are benefits to 4.1MP RAW images. Printed to A4 size, they look just as good as 12MP camera images. If you never even print images, why buy a 12MP camera?

The D2Hs is a professional camera and feels like one. The speed at which the mirror returns to position after taking a shot is nothing short of phenomenal. It's literally just a click sound... unlike most other Nikons [and pretty much any Canon]. The screen blackout is as good as non-existent.

If you're just a hobbyist and you want a professional camera, this might just fit the bill. It's more than a few steps up the evolutionary ladder from the likes of every other camera except the D2Xs and the D3.

 
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