DPI Question

Discussion in 'Digital Photography' started by MT37, Dec 12, 2006.

  1. MT37 macrumors regular

    MT37

    Joined:
    Aug 9, 2006
    Location:
    Oshawa, ON, CA
    #1
    I'm curious if there is a way to change the DPI on my Canon Rebel XT.

    I would like to change it to 300 if possible.

    Thanks.
     
  2. Grimace macrumors 68040

    Grimace

    Joined:
    Feb 17, 2003
    Location:
    with Hamburglar.
    #2
    DPI is for printing. You want to change the pixel count on the Rebel to the highest possible setting. Set it to L (large) or RAW. Dividing the pixel count [ex. 3600x2400] by 300dpi printing gives you the largest size you can print at that [print] resolution [12x8].
     
  3. MT37 thread starter macrumors regular

    MT37

    Joined:
    Aug 9, 2006
    Location:
    Oshawa, ON, CA
    #3
    Ah, right. I always shoot Large or RAW. So I would have to change the DPI in Photoshop? I have noticed all my pictures are 72 DPI.

    Sorry, I'm trying to figure it out so I can print some of my photos at 300 DPI.

    Thanks again. I'm sorry if I'm being a bother.
     
  4. -hh macrumors 68020

    -hh

    Joined:
    Jul 17, 2001
    Location:
    NJ Highlands, Earth
    #4
    To change DPI

    In Photoshop CS2, with an image open:

    Go to IMAGE menu

    Halfway down, click on "Image Size..."

    In the dialog that opens, it should be:

    Pixel Dimensions:
    Width (value)
    Height (value)

    Document Size:
    Width (value)
    Height (value)
    Resolution (value) <--- you'll want to change this one to 300

    Then three checkboxes:

    [ ] Scale Sizes
    [ ] Constrain Proportions
    [ ] Resample Image <--- but watch out for this box. You probably don't want it checked

    ----



    When importing in RAW, look in the bottom left: Space, Depth, Size, Resolution (value).
    Change the last one from 72 to 300 and you should be set.





    -hh
     
  5. MT37 thread starter macrumors regular

    MT37

    Joined:
    Aug 9, 2006
    Location:
    Oshawa, ON, CA
  6. CanadaRAM macrumors G5

    CanadaRAM

    Joined:
    Oct 11, 2004
    Location:
    On the Left Coast - Victoria BC Canada
    #6
    To clarify:
    you take pictures in pixels -- so a 3000 x 2000 file would be 6,000,000 pixels or 6 megapixels.

    How large you print this is controlled by your printing software and choices.

    At 72 pixels per inch resolution (conventional monitor screen resolution), it would be 41 inches by 27 inches

    The same collection of 6M pixels at 300 pixels per inch resolution would be 10 inches by 6.6 inches
     
  7. Abstract macrumors Penryn

    Abstract

    Joined:
    Dec 27, 2002
    Location:
    Location Location Location
    #7
    Be careful. There's a difference between DPI and ppi (pixels per inch). You want 300 ppi, but the DPI is more of a printery thing that you don't take care of in your end.
     
  8. MT37 thread starter macrumors regular

    MT37

    Joined:
    Aug 9, 2006
    Location:
    Oshawa, ON, CA
    #8
    Alright, everyone has been a great help. Thanks again.
     

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