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Hey Damien, 

I have a client who is getting a warning that her digital file is too low res to print a 40"x60" print.  I discovered that the file size 72ppi, I read your analogy about 72ppi and 300ppi but the lab she wants to use requires 300dpi.  Can I just go into image size and simply change it?  When I try to do that it changes the file size from 6mb to 49 mb, is that ok? 

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The PPI is irrelevant.  Only the pixel dimensions (height by width) are relevant.  What are they?

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Great!  So increase that to 12000x18000 at 300ppi, and send the file to her.  Save it as a jpeg at Level 7 quality.

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Thank you so much!  I wasn't sure if it was just that simple.  She's very hung up on the fact that the file size is only 6MB.  If I understand it correctly, that has nothing to do with resolution or quality of the image, am I right?  

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