Problem printing large photos from Canon EOS30D
Hi all,.

Not long had my camera and am keen to use on family portraits etc and have read that the camera is capable of taking photo quality images for up to and above A3 in size. However when I uploaded my images to my PC I noticed that the size is just less than A4 when taking the photos with the camera set to it's highest quality setting..

The images initially are set to 72ppi when I open them up on the computer but when I alter this to 300 ppi ready for print this reduces the size to just under A4. In my daytime job I design a small magazine where the commercial printers always insist on my images being 300ppi. Can anyone explain how I can get my camera to take photos which can create hi quality A3 prints without having to resample the images and therefore down grading the quality of them. The pixels of these images I have taken are 3504 x 2336. I did look at taking them as raw files but this doesn't seem to make any difference although I must admit to knowing very little about this format.Hope someone out there can help me with this problem.RegardsPaul..

Comments (9)

That is simple maths. At 300 DPI, you can get max. print size of 3504/300x2336/300 inch. i.e. 11.7" x 7.8" only. Nevertheless one can get acceptable prints at 150DPI too if these are to be hung on the wall.

However for printing at larger size at 300DPI, you will have to upsample. No way out..

Paul Metcalfe wrote:.

Can anyone explain how I can get my camera to takephotos which can create hi quality A3 prints without having toresample the images and therefore down grading the quality of them.The pixels of these images I have taken are 3504 x 2336.

Best Wishes, Ajay

Comment #1

If you have an A3 printer it will print them but you'll not get 300 ppi but something more like 200 ppi. Not that it matters, 300 ppi is "exhibition" quality and most people wouldn't know it when they see it..

Not so long ago I seem to remember Canon saying 3 mp for up to A4 and 5 mp for up to A3. Your 8 mp are more than enough..

BTW, the printer software will probably handle the work needed. And, if you want to check then crop out a quarter of the picture and print it at A5 (cheapest) or crop out half the pixels and print them at A4 (dearer)..

BTW 2, your camera is 3:2 aspect ratio and A4, A3 etc are 1:1414, so a bit of the photograph will have to be cropped to fit A3 (Again the printer or viewer may do it for you.).

Regards, David..

Comment #2

The 72dpi that appears on your monitor is the default for all crt monitors. it goes there automatically. you certainly do not have to leave it there..

Also at work the 300dpi is for magazine purposes not home printing. you are LOOKING at a magazine from 12-18inches from your face. you get a 20x30 or 16x20 print you are not looking at the print from 1ft. it is hanging on a wall and you are looking from several feet away. I have a 20x30 on my bedroom wal that I see from about 7ft away and it looks fine..

I have a dslr that is a 6mp sensor, I have made many prints of 16x20 and 20x30 with no problem in looking at them. you did not state wether you had a large format printer. try sending them to I have my large prints made), it is free. they are expecting you to buy prints. once uploaded they in their software will tell you what size they can print at. they can also color correct and crop to fit.

They can print to 20x30, and the work is suberb. all they need is a jpeg of your shot. I use max quality jpeg when I send to them, and keep them in a folder that is labeled kodakjpeg. I now have several hundred shots on their server..

I you are using pe5-6 or csx and you looking the print page you will see a spot that you can tell it what size to print. there is also a natural size that is so many feet by so many ft. I do not resize for that; all I do is tell it what size I want and it does it and sends it to the printer. for kodak you do even do that just send the original as a max qual jpeg and they do the work...

Comment #3

Thanks for all your replies I have gleaned knowledge from each one of them especially the one that points out the obvious fact that when in a magazine images are viewed far closer than portraits up on a wall something I hadn't thought of. So next time I am in a shop selling framed photographs I will study the quality of the image resolution within them.thanks again...

Comment #4

I'm not sure whether you are asking because your camera doesn't appear to match Canon's claims, or because you actually want to make an A3 print! If you do want to make a print of that size (or indeed larger) it could be worth upsampling the image to 300 dpi (or even 360 dpi) at the output size. Use Photoshop's Bicubic Smoother option, then sharpen to taste. The advantage of this is that it removes the slight 'coarseness' that you can get with a lower resolution, resulting in a subjectively cleaner image..

The actual amount of resolution needed (before upsampling, that is) for a really good large print depends to some degree on the subject. You can get away with remarkably low resolution for a portrait; landscapes on the other hand benefit from lots of detail. Possibly the most demanding is a large print of a group - because the viewing distance rule breaks down. It doesn't matter how big the print is, people will always want to get close to see the individual faces..

Recently I was looking at some big prints of aerial photography taken with a 1DsII - 16.6 beautifully clean noise-free megapixels. Even that wasn't really enough. However much stunning detail we saw, we just wanted more...

Comment #5

GaryDeM wrote:.

Also at work the 300dpi is for magazine purposes not home printing..

I work for a magazine and we have a 300dpi recommendation..

But in reality since our magazine prints at a 150 line screen, a 150dpi image is virtually indistinguishable from 300dpi. Of course we're a trade magazine and not concerned with art-mag quality...

Comment #6

You can use something like.


(it's not the only solution, just one of them as an example), which would work to a certain limit, of course. Or just print at lower resolution, say, 180 instead of 300. Just try it and see if you will notice the difference. The easy way to determine the acceptable quality maximum enlargement/crop for a certain camera is to make standard size prints, cutting the original file in halves in the Photoshop (or whatever you use to process), so that photo #1 is full size, #2 - half (equivalent to 2x size standard), #3 - quarter, etc. A very cheap, quick and exact way to measure it. Don't be afraid to do it, you'll most likely be more than happy with the results..


Comment #7

Paul, you don't explain what technology you want to use to create A3 prints. (A3 is around 13 x 19, for those like me who need to look this up).

A/ If you intend to take a digital file to a commercial la, such as in a big store where you put a disck or card or thumb drive into a computer on the counter, that's one thing..

B/ If you intend to use a high quality ink jet printer, that's a different thing..

Regardless, your camera is fine as far as making images that can get this big is concerned..

Regarding>where the commercial printers always insist on my images being 300ppi. < They lie a lot, and they don't know what they are talking about, a lot. And they are deliberately obtuse, a lot. Take your pick..

EVERYONE IS CONFUSED for a while about that 72 reading in software like Photoshop Elements when looking at an image on a screen..

That's probably not accurate, anyway, and besides, your computer does all kinds of things to your images when you look at them on your screen..

As far as A/ above is concerned. Take your photo with your camera set to the largest size and highest resolution JPEG possible..

That gives you an image 3500 x 2300 pixels. IF you want to edit this photo, use something like Photoshop Elelments to change the color, add or subtract contrast, etc., but do not resize it..

Copy the file to a portable storage device CD, tumb drive, back to a Compact Flash card, and take it to the torte. The store's machine will automatically make whatever adjustments are necessary..

I make 12 x 18 enlargements at Costco in Canada all the time, and the quality is fantastic..

For B/, the procedure varies with the printer and the software. Regardless, it works fine..

More about commercial printers ths process gets complicated because there's a conversion from PPI (pixels per inch) to DPI (dots per inch) on the way to making printing plates. As a general rule, a 1:1 relationship between PPI and DPI is OK, and a 1.5:1relationshiop is just fine. That means if a shot is being printed at 135 lines per inch, you should have 1.5 times this, or 200 pixels per inch, inyour original file..

So your A3 size is still OK for a two page magazine spread, where the total area is 11 inches x 17 inches, requireing, at 200ppi, 2200 x 3400 pixels..

Anyway, go try to get a print made from your file without doing any resizing, and you'll probably be delighted..


Comment #8

BAK wrote:.

Paul, you don't explain what technology you want to use to create A3prints. (A3 is around 13 x 19, for those like me who need to lookthis up).

13x19 is the size that Epson have confusingly, and wrongly, referred to as "Super A3/B". It is actually the standard US tabloid size (11x17, also known as ANSI B) with a margin of 1" all round to allow room for bleed and printer's marks. As far as I know it is not an 'official' size and is purely an Epson invention - can anyone with knowledge of the US print industry confirm or deny that?.

13x19 also happens to be big enough to accommodate A3 with margins - uneven margins, but perfectly adequate. 13x19 converted to metric is 330 x 483 mm, and A3 is 297 x 420 mm so it is a comfortable fit..

13x19 is also very conveniently 12x18 with a 1/2" margin, so it works well for large prints from a 3:2 SLR. I suspect that too is a happy coincidence, because Epson's paper size originated before inkjet printers were capable of photo-quality output (although we were bowled over by the quality at the time!)..

Just for completeness - there is an 'official' size for A3-with-a-margin, known as SRA3, used by the printing industry worldwide except the US. These 'raw' (i.e. untrimmed) paper sizes are in everyday use in the printing industry but never seen anywhere else...

Comment #9

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