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My Poster is only 850kb! How do I make it hi-res?

Aug 18, 2011, 14:28
Post: #1
My Poster is only 850kb! How do I make it hi-res?
I am trying to create a 30" 24" poster that contains (12) 3" x 4" photos. I have resized all of the photos from 2.5MB, but the completed poster is only 850kb. I do not think that if I were to print this out to 30" x 24" that it would be 'poster quality'.

I did notice something strange... when I have the file open I noticed that at the bottom left it has (53.8MB) in parenthesis.

Can anyone help me to create the correct resolution that I need to make sure this poster looks like an actual poster?

Thank you,
Craig
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Aug 18, 2011, 15:50 (This post was last modified: Aug 18, 2011 15:50 by rich2005.)
Post: #2
RE: My Poster is only 850kb! How do I make it hi-res?
I'm assuming you are going to get your poster printed at some sort of "printing house". I occasionally get a panorama printed this way.

FWIW I would start off by opening a new image, choosing any one of the 300 ppi presets and change the size to 30" x 24".

It will be a big image and you will probably get a warning about the size. Keep going.

Thats your blank canvas and you can open images then copy and paste into it.

Here is an example, http://i.imgur.com/dL2F0.jpg with some images pasted in. It saves to a 2.5 MB 85% jpeg. That is mostly white so expect a bit larger but not enormous.

One thing if you are taking it to be printed, your image will be 'landscape', saves a lot of hassle if you rotate it yourself for printing as 'portrait'

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Aug 18, 2011, 16:15
Post: #3
RE: My Poster is only 850kb! How do I make it hi-res?
If you want to make a 30"x24" poster the image should be at least 4500*3600 pixels, if you want to look at it up close (150DPI) and closer to 9000*7200 if you want it real sharp (300DPI). Otherwise, your definition doesn't need to be better than 1/2000 of the diagonal (this corresponds roughly to a 6MPix image (2200x2750 for a 30:24 aspect ratio).

The size in MB you have is the memory size used for all your image (the layers, channels, and the undo stack...) The only useful measure is the size in pixels.

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Aug 18, 2011, 17:51
Post: #4
RE: My Poster is only 850kb! How do I make it hi-res?
Wow! Thank you very much for the help. I think this will solve my problem. I appreciate your efforts.
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