Printing vs image size

Below image I tried to print 13x19 but it printed 12 5/8 x 16 1/4. it is 3456 x 5184 (17.9mp) what does this translate to printed size. This printed image the top is cut off and the bottom also.

Program I'm using to print is Aperture, printer is a Canon Pro9000

IMAGE LINK: http://s305.photobucke​t.com …5686_zpshi83mnb​v.jpg.html

Print size is affected by DPI (dots per Inch), what is the DPI setting on the image?

300 dpi. I tried printing thru PS CS6 - set size @ 105% it stated image would be 12.095" x 18.1xx" is still printed the 12 5/8 x 16 1/4. I do not know what setting I changed. I was able before to print edge to edge using either program the this printer.

I suspect the software assumes a different paper size in the printer than what is loaded!

1. Your original pixel count is 1.5:1 aspect ratio
   
2. Your 12.1 x18.1" print size at 105% is also 1.5:1
   
3. But your actual print area is 1.313:1
   

EnglishBob wrote in post #17681836
Print size is affected by DPI (dots per Inch), what is the DPI setting on the image?

No, it is not! The native ppi (image dimensions/paper dimensions), in this case 267 ppi, is enlarged to 300 ppi (112% increase) in the printer driver because that is the ppi needed by Canon printers to create the dot matrix. For photo quality the printer will print at 1200, 2400 or 4800 dpi. Epson printers use 360 ppi as their base resolution and print at 1440, 2880 or 5760 dpi.

The DPI tag on the image is archaic and irrelevant unless you prefer the sending application to do the resampling instead of the driver; in this case, because of the small difference between 267 and 300, it is probably irrelevant which one does it. The file might be tagged 72 DPI by the camera, 240 or 300 DPI by editing software, or any other number; the resampling will always be the same - 3456 to 3871 pixels.

wysiwyg59 wrote in post #17681833
Below image I tried to print 13x19 but it printed 12 5/8 x 16 1/4. it is 3456 x 5184 (17.9mp) what does this translate to printed size. This printed image the top is cut off and the bottom also.

To print borderless on 13x19 paper, which has a ratio of 1:1.46, the image must have the same ratio. You must crop it to 3456 x 5046 pixels. If left at 3456 x 5184, 136 pixels on the long side will be off the paper.

The fact that the image printed at 12 5/8 on the short side sounds as though either the driver interface or Aperture or both were not set to borderless. However, in that case the long side should have been around 18 1/4. Another possibility is as Wilt notes, that the driver was not set to the proper paper size.

clipper_from_oz wrote in post #17682089
yep key to it is ratio...if the ratio is wrong for paper you need to adjust in PS to print in the area of paper size and be prepared for a ink area that doesnt cover the whole page......Or zoom via PS to over 100% and fill the page but lose part of the image

Better way to go is crop paper before printing or use over size paper size and trim paper after printing to the image size

How does one calculate ratio to paper size? Never done this but interested in printing. For example, if I want to print the same image as 8x10, 13x19 and 16x20?

Thanks.

Just dont print borderless and trim image after printing

Ya, but if one wants borderless....

You were quick...I actually deleted this reply because I realised you printed to border.less......

Re printing to ratio.....You can see it in a print preview in PS....thats what I do....and if I have cropped to much and its not right ratio then to get a better fit to the std paper size ratio I go back and crop whatever is needed .....It can be calculated but for me its easier just to preview in print area of PS..........In Lightroom I know there is a setting to keep the crop the same ratio as the original RAW( which matches most normal printers paper size ratio's) but not sure in PS if there is a setting to maintain crop ratio...Probably is same also for Aperture

Calculating the aspect ratio is simple, for prints or digital files. Simply divide the long edge by the short edge. For prints use the actual measurements in inches, cm, or any other measurement scale you wish to use (just make sure you use the same units for both edges). For digital just use pixels. One other note, because you are dividing by two identical sets of units the result is a value with no scale units.

Once you have the ratio, for example all the ISO A series paper sizes have a ratio of 1:1.414, it becomes quite easy to know that if your digital image is 3116 pixels on the short edge, you will need to crop it to 4407 pixels to fit the correct aspect ratio. The advantage for the ISO A Series paper sizes is that this aspect ratio is constant (and for each single digit reduction of paper size you end up with exactly half the area). The calculations will apply equally to any other paper sizes too. So 10×8= 1:1.25 (4:5), 16×12= 1:1.333 (4:3) 6×4= 1:1.5 (3:2), etc.

Alan

Naturalist wrote in post #17682095
Ya, but if one wants borderless....

Easy.....print the correct size image on the paper to fit and then trim the paper after printing....Then its borderless

On a serious not I actually do this all the time....90% of my finished printed images are not std ratio aNYWAY.........Infact I hate the old std FF and 35mm ratio's....I much prefer the medium format ratios of 1:1 ( 6x6) and the wider 3;1( 6x17) and 6x9 and newer format of 16:9...Infact anythings better than 3;2..And for me the wider the more it gets closer to how the human eye sees things and if Im framing those wider sizes are way better for landscapes....except for Ansels favorite of 6x6 which I use for some B&W prints......

So I invested in a $40.00 guillotine from Office works and I now trim to whatever size I like without having to compromise my cropping to fit a so called std size

I print regularly from my files to 5x7 and 8x10.
After I've retouched the image, I save it, and put it to the side.
I then create a new file from scatch and create a canvas 8" x 10" (or whatever size).
I then move my image around till I like the result, and imbed.
(This allows me to create a print w a border of any size I'd like or no border)
Couple notes.
I always take portraits w a bit of additional space around the edges because my finished product will have a border.
The file is not inherently 8x10' so unless I want to print to its native ratio, I'll have to crop.
My printer software allows my to change print settings if needed...but I've not had to change it to anything other than landscape and portrait and margin parameters (in relation to size anyway.)

Hope that helps?