Inch to mm

Forum|Forum|6 years ago
February 21, 2020
3 replies
1093 views

I need to deliver a file in the exact measurement of 227x285mm and in 300dpi.

So far I have been working in 300ppi (thats what photoshop offers) which I understand is the same as 300dpi. No matter how I try the file when going from pixels to mm comes out to 226.99x284.99mm. This might not seem like much but the uploader for the artowk wont accept unless the measurement is exact. What am I doing wrong?

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L

Lumigraphics

Legend

Tell them its not possible. One of those numbers has to change.

D Fosse

Community Expert

It's inches vs. millimeters. That specification is in fact impossible if exact numbers are required. It can't be done with clean numbers and someone should tell them so because I can't imagine it matters in practice.

Pixels per inch doesn't give you a round number in millimeters, unless the numbers are big enough. They aren't here.

If it's a matter of getting this uploaded or not, I'd just increase size or ppi until it's accepted by this dumb uploader.

c.pfaffenbichler

Community Expert

300ppi corresponds to 118.11pcm so, as D_Fosse pointed out, the intended size-lengths in mm do not correspond to integers.

c.pfaffenbichler

Community Expert

A digital image per se has no dpi but ppi – dpi and ppi are not the same.

dpi applies to output devices like plate-setters.

What are the image’s pixel dimensions?

What file format do you provide?

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