I'm trying to resize a photo taken with a Canon 5D Mark III for a 36" X 72" canvas at 300ppi through Lightroom 5. I exported the photo at H: 10800 X W: 21600, but the printing company is telling me that the resolution is still too small. Can anyone give me a suggestion?

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    \$\begingroup\$ Possible duplicate of What is a suitable image resolution for canvas prints? \$\endgroup\$
    – mattdm
    Commented May 10, 2016 at 2:26
  • \$\begingroup\$ Did you verify that the exported image actually had those dimensions? I'm not familiar with Lightroom's behavior, but some software will only use the dimensions you give for downscaling, and will do no resizing if the image is already smaller than the specified size. \$\endgroup\$ Commented May 10, 2016 at 4:44
  • \$\begingroup\$ It has TOTALLY no sense on resampling an image like that! Send the original file! \$\endgroup\$
    – Rafael
    Commented May 10, 2016 at 14:25
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    \$\begingroup\$ 10800 x 21600 is 230 megapixels, your camera has 22 megapixels \$\endgroup\$
    – szulat
    Commented May 11, 2016 at 7:32

1 Answer 1


We already have quite a few answers on this topic, so you should do some reading at least here:

The short of it is that you should not resize anything on your side. Let the printer do that for you. Send them the largest image you have before you have tried any resizing. It should work just fine for what you are doing(assuming up to 72 inches) if the image was from a 5D MkIII.

  • \$\begingroup\$ But... the question implies that the printers aren't going to do that for them, and have said so. \$\endgroup\$ Commented May 10, 2016 at 4:41
  • \$\begingroup\$ @junkyardsparkle Yes I agree that it implies that. The issue I believe is user error and not any printer shortcomings. \$\endgroup\$
    – dpollitt
    Commented May 10, 2016 at 5:49
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    \$\begingroup\$ I can not understate the importance of this: "The short of it is that you should not resize anything on your side"... (Is that a correct use of understate? :o) \$\endgroup\$
    – Rafael
    Commented May 10, 2016 at 14:27

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