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03/02/2017 08:55:29 PM · #1
My sister-in-law would like to print one of my photographs and put it on her wall.
She would like the print to be 36 inches by 24 inches.

My camera generates 5184 px x 3456 px (3 x 2)
I was told to Always Measure in Pixels.

I have got into the habit of cropping my images in photoshop:
3600 pixels x 2400 pixels at 300 dpi. This produces a 12 x 8 (inches) if printed.

She wants 36 x 24 (inches) at high resolution.

What do I give her?
What do I set in photoshop?

1. 3600 x 2400 x 300dpi = 12 x 8
2. 3600 x 2400 x 100dpi = 36 x 24

Which one produces the best resolution if both were blown up to 36 x 24 (inches)?

Any help would be kindly appreciated.
03/02/2017 09:01:41 PM · #2
Don't crop or resample your image unless necessary for composition.

At your native camera size (5184px) a 36" print would be at 144 ppi, which is probably "good enough" for an acceptable print. For example, if you wanted to offer it for sale here (DPC Prints) you would only have to upsample a little bit to 150 ppi.

Basically you want the longer dimension to be about 5400 pixels (36" x 150 ppi). When I have an image close to a standard size I just add a border to bring it up to the standard print size.
03/02/2017 09:18:16 PM · #3
To add to Paul's post, both your option 1 and 2 would produce exactly the same results because they start with images of the same pixel size.
Since the desired size matches the aspect ratio of your photo, there is no need to crop at all, and really there is no need to resample either; the printer can and will manage that. Your native image pixel dimensions will result in a very nice print at that size.
03/02/2017 10:22:01 PM · #4
What they said. If you're using a quality printing service, they will take care of whatever upsampling may be required, Their people are always good at it. I give MY printer unsharpened images as well; he can better handle that after the other necessary adjustments are made.
03/02/2017 11:10:12 PM · #5
Thank you very much for all the information.
I have taken everything on board but am still in a bit of a quandary.

1031.gif GeneralE says Don't crop or resample your image unless necessary for composition.

Great, I usually don't have to crop.

21.gif kirbic says Since the desired size matches the aspect ratio of your photo, there is no need to crop at all, and really there is no need to resample either; the printer can and will manage that. Your native image pixel dimensions will result in a very nice print at that size.

30861.gif Bear_Music says they will take care of whatever upsampling may be required.

So what would I put in the Photoshop boxes?

1. 5184 x 3456 x 144 dpi
2. 5400 x 3600 x 150 dpi

Message edited by author 2017-03-02 23:20:25.
03/02/2017 11:25:13 PM · #6
I love receiving advice from members on this site.
03/03/2017 12:16:36 AM · #7
Originally posted by johnbrennan:

So what would I put in the Photoshop boxes?

1. 5184 x 3456 x 144 dpi
2. 5400 x 3600 x 150 dpi

Nothing. It doesn't matter. Those DPI figures are just what you tell your (home) printer to do when you are printing (at home), basically. If you are sending your work to a competent professional lab (not walmart or something) you just upload the processed original at full size and tell them what size you want the print to be. They have more tools and better experience than you do at preparing images for print. For example, they'll adjust paramters as needed to compensate for the different surfaces you can choose to print on; matte paper needs different values than luster or glossy paper, and so forth and so on. They'll let you know if there's an issue. If possible find someone in your city who does this kind of printing and establish a personal relationship with them It's worth it.
03/03/2017 01:13:47 AM · #8
Originally posted by bearmusic:

just upload the processed original at full size and tell them what size you want the print to be.


I see.

Thank you for that.
03/03/2017 02:04:58 AM · #9
Originally posted by Bear_Music:

If possible find someone in your city who does this kind of printing and establish a personal relationship with them It's worth it.


I have just this minute made contact with a printing professional in my area, so I thank you for your suggestion.
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