Converting image to DPI?

SpeedFreakSpeedFreak Registered Users Posts: 16 Big grins
edited June 25, 2006 in Finishing School
I use Photoshop Elements 3 and understand the difference between PPI & DPI.
I want to do a calendar with Lulu.
They want 11.25"X8.75" images at a resolution of 300DPI not PPI.
I also want to do some stuff with Cafepress. They recommend uploading images at 200DPI.
So...how do I convert my pixels to dots?
I'm lost on this one!:dunno


www.dvwphoto.com

Comments

  • cletuscletus Registered Users Posts: 1,930 Major grins
    edited June 16, 2006
    Take a look here.
    ab0wa.smugmug.com
  • AndyAndy Registered Users Posts: 50,016 Major grins
    edited June 16, 2006
    cletus wrote:
    Take a look here.
    wave.gif Hiya Cletus :D
    Andy

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  • SpeedFreakSpeedFreak Registered Users Posts: 16 Big grins
    edited June 16, 2006
    So I guess what you are saying is that Cafepress & Lulu really mean PPI when they say DPI.
    Yet Cafepress goes into detail explaining the difference at:
    http://www.cafepress.com/cp/info/sell/images/help_images#res

    Andy, I know you use Lulu...whose done stuff with Cafepress?
    Still confused! headscratch.gif
  • edgeworkedgework Registered Users Posts: 257 Major grins
    edited June 16, 2006
    SpeedFreak wrote:
    So I guess what you are saying is that Cafepress & Lulu really mean PPI when they say DPI.
    Yet Cafepress goes into detail explaining the difference at:
    http://www.cafepress.com/cp/info/sell/images/help_images#res

    Andy, I know you use Lulu...whose done stuff with Cafepress?
    Still confused! headscratch.gif

    It's confusing. Technically, dpi is a measure of the frequency of your halftone screen when printing to a press. That the same terminolgy has become the standard method of expressing image resolution just proves that no one's really driving the bus.

    If you ever need to prepare images for a press, then you'll need to know that the resolution needs to be about 1.5 — 2 times the frequency of your screen. A 150 line screen would call for a 300 dpi image. But no one really pays much attention to that any more either. 300 dpi has become the standard for hi - res images, no matter what the output destination. 150 dpi for newsprint images, which print at with a screen of either 65 dpi or 85 dpi. Don't bother doing the math, it doesn't add up, but it works.
    There are two ways to slide through life: to believe everything or to doubt everything; both save us from thinking.
    —Korzybski
  • SpeedFreakSpeedFreak Registered Users Posts: 16 Big grins
    edited June 25, 2006
    "There are two ways to slide through life: to believe everything or to doubt everything; both save us from thinking."
    —Korzybski
    I like that quote!!

    Too much thinking involved with all this DPI/PPI stuff!

    It's sort of like a fisherman from Harkers Island trying to talk to a fisherman from Maine...they both speak English....but something gets lost in the translation.
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