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TS-IOR
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Resolution For A4 Print

Wed Jun 03, 2015 2:58 am

I shoot in RAW at 2848x4272 or 4272x2848 :-P with a 12.2MP Canon APS-C and would like to print in A4 format and get the whole frame as it appears in the original photo and not cut anyhow! At 2490x3510 i got less cut but still not what i want. Still cut and a 2mm white sheet line appears on two sides of the frame.

What resolution shall i crop to in order to have a full 8.5x11" print? Also what is the appropriate resolution for standard postcards size.

Is the Epson XP-410 good enough or is it not the right one for optimal result?
 
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scbriml
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RE: Resolution For A4 Print

Wed Jun 03, 2015 6:06 am

You should allow 300dpi for printing. So for an old-fashioned 6" x 4" print, you'd need to resize the image to 1,800 x 1,200 pixels.

Your issue with using A4 is that the aspect ratio is different to the camera's, so you'll either have to crop the image slightly to fit edge to edge (assuming the printer can print right to the edge of the paper), or have some white border. To fill an A4 page, you'd need an image resolution of 3,300 (11x300) x 2,250 (8.5x300).
 
ckw
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RE: Resolution For A4 Print

Wed Jun 03, 2015 7:55 am

Resolution required depends on a number of factors, including viewing distance and visual acuity. Basically the larger you print, the less resolution required - people don't generally view a 16x20 print from a distance of 6 inches!

For an A4 print a resolution of 200 dpi is more than adequate. A very useful guide, with the various factors explained, can be found here:

http://www.photokaboom.com/photograp...on_print_size_viewing_distance.htm

I've produced prints up to A1 size at 100 dpi which look stunning on the wall.

But for A4 you are either going to have to crop a little or put up with a white border - the format of A4 and APS-C are annoyingly just a little different.

Colin
 
angad84
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RE: Resolution For A4 Print

Wed Jun 03, 2015 11:42 am

Quoting ckw (Reply 2):
Resolution required depends on a number of factors, including viewing distance and visual acuity. Basically the larger you print, the less resolution required - people don't generally view a 16x20 print from a distance of 6 inches!

Yep! I find that I get good results at a range of sizes from A4(ish) and up if I just peg the resolution at 120 dpi.

Not for exacting (read: display) purposes though — just for when I have to run off a half dozen photos for my little cousins, or my friends' kids to put on their walls.

For high quality prints, for example to gift to a squadron after they've hosted me, I print the highest reso possible for the desired print size, so if I can get away with a wall-sized print at 300 dpi, then why not? 

Cheers
A
 
iamlucky13
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RE: Resolution For A4 Print

Fri Jun 05, 2015 8:36 pm

It sounds like resolution isn't your problem, but aspect ratio, assuming in the first place you're actually using a printer capable of borderless printing, which not many are at A4 / ANSI A size. Most printer utilities also give you the option to automatically scale the ppi as necessary to fill the whole printable area. These days, it's rare to have to scale the image file to the equivalent of 300 dpi manually.

The XP-410 specs do seem to say it does borderless printing, but not all printers do it perfectly, as far as I know. It's also possible for paper to feed imperfectly and get a very slight border as a result.

Also, are you using A4 or 8.5" x 11" (ANSI A)? I know the two terms get used interchangeably in the office environment, but A4 is 297mm x 210mm (8.27" x 11.7"). The image size you said you used is very close to A4, but still not a match.

Since your camera has a higher aspect ratio than you're trying to print, base your final image size on the shorter edge of what your camera produces, and multiply that by the aspect ratio of the print.

So since 297mm / 210mm = 1.4143, multiply the short edge of you image file by that.

If your image is 2848 pixels on the short edge, then crop it to 4028 x 2848 pixels. You should not have to scale it to 300 dpi, but if you want to, then the final image would be 2480 x 3508.
 
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TS-IOR
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RE: Resolution For A4 Print

Sun Jun 07, 2015 2:15 pm

Thank you much.. Very informative  

Is there special paper for the 4/3 format so it fits automatically. Cause am thinking to move to mirrorless but not yet decided if crop sensor or 4/3.
 
ckw
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Joined: Fri Aug 27, 2010 12:26 am

RE: Resolution For A4 Print

Mon Jun 08, 2015 8:06 am

Sadly not many paper sizes which match 4:3 exactly exit, and the ones that do exist are pretty specialised (eg. for use in architecture)

12x16 used to be available as a size for photographic paper, but I don't know of any photo printing paper at this size.

In practice I think shooting at 4:3 you will inevitably be cropping the image or trimming the print.

On the plus side, I like the 4:3 format as a think it is more versatile for composing - eg. while I like 3:2 landscape, I find 3:2 portrait too long and thin, so I was often cropping DLSR shots to 8x10 ... with 4:3 I can crop less.

Many 4:3 cameras have the ability to shoot in a different format (3:2 or 16:9), so you can still work in the format of your choice, but of course you will be losing part of the image area, so a bit less total resolution.

Cheers,

Colin
 
epten
Posts: 194
Joined: Thu Sep 13, 2007 5:12 am

RE: Resolution For A4 Print

Mon Jun 08, 2015 11:30 am

Any modern RIP (Raster Image Processor) will do fancy oversamplings of the image before printing anyway, so you really don't need to worry about pixel count and/or resolution that much. If it looks detailed on the screen - it will look fine on the paper. Don't worry.

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