What image resolution do I need for a large canvas on my wall?

mndmeld

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Hi all,
Hoping someone can give me some guidance.
I’m looking at purchasing a large pop culture canvas for my wall. You know the ones where the image is split into panels - probably 5.
The size will be up to about 150cm wide and about 80cm at the highest point.
So my question is what resolution/ppi should the source image be so that the end result is really clear and sharp - no blur??
Thank You.
 

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Blur implies movement, you mean visible, recognisable pixels, right?

Say a FF 12 MP sensor — defining a 2:3 ratio image. That would mean, at
300ppi, 133,3 square inches of printable area. A 11:14 is 154 si, that would
be enough. For 16:20 print, not so, as it is 320 si.

Say a FF 20 MP sensor — defining a 2:3 ratio image. That would mean, at
300ppi, 222,2 inches square of printable area. A 16:20 is 320 si, that would
not be enough.

Say a FF 24 MP sensor — defining a 2:3 ratio image. That would mean, at
300ppi, 266,6 inches square of printable area. A 16:20 is 320 si, that would
not be enough either.

These are calculations for the printing industry where images are explored
at normal reading distance. The further away one looks at a picture, the lo-
wer the resolution may be. A billboard by the side of the road is printed at
72 ppi and must seen from a distance.

Digital photos are enlarged at around 250 ppi.
 

WalterRowe

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I prefer at least 600 ppi. Using that as a basis, you would calculate the total width and height of all the panels and multiply each dimension by 600 to get the overall dimensions in pixels. In your example of 150cm x 80cm is roughly 2:1 aspect ratio. Let's call that 36x18 inches for simple math sake. So 36x600 for width in pixels, and 18x600 for height in pixels. Once it is sized you would need to split it into the panels that make up the overall picture. If you use a print service to make the panels, I recommend you contact them and they can help you size it accordingly. They can also help you split it. They might even do the entire resizing for you.
 
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mndmeld

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Blur implies movement, you mean visible, recognisable pixels, right?

Say a FF 12 MP sensor — defining a 2:3 ratio image. That would mean, at
300ppi, 133,3 square inches of printable area. A 11:14 is 154 si, that would
be enough. For 16:20 print, not so, as it is 320 si.

Say a FF 20 MP sensor — defining a 2:3 ratio image. That would mean, at
300ppi, 222,2 inches square of printable area. A 16:20 is 320 si, that would
not be enough.

Say a FF 24 MP sensor — defining a 2:3 ratio image. That would mean, at
300ppi, 266,6 inches square of printable area. A 16:20 is 320 si, that would
not be enough either.

These are calculations for the printing industry where images are explored
at normal reading distance. The further away one looks at a picture, the lo-
wer the resolution may be. A billboard by the side of the road is printed at
72 ppi and must seen from a distance.

Digital photos are enlarged at around 250 ppi.
Thanks very much for your reply. And yes, I did mean recognisable pixels as opposed to movement. Thanks for helping me clarify that.
 
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mndmeld

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I prefer at least 600 ppi. Using that as a basis, you would calculate the total width and height of all the panels and multiply each dimension by 600 to get the overall dimensions in pixels. In your example of 150cm x 80cm is roughly 2:1 aspect ratio. Let's call that 36x18 inches for simple math sake. So 36x600 for width in pixels, and 18x600 for height in pixels. Once it is sized you would need to split it into the panels that make up the overall picture. If you use a print service to make the panels, I recommend you contact them and they can help you size it accordingly. They can also help you split it. They might even do the entire resizing for you.
Thanks so much for your reply. I actually get it now! 😊
 

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