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Thread: how many dpi do you save with your jpg ?

  1. #1

    Default how many dpi do you save with your jpg ?

    While I'm doing post processing from RAW to jpg, I usually save it as 240dpi. Wondering what's your preference?

    Care to share your experience and any reasonable behind if to set the dpi too high eg.300dpi or too low eg.150dpi ?
    But, I can see the file size real make the different.

    All inputs welcome

    Thanks.
    Canon 40D|17-55 f/2.8 IS|100 f/2.8 Macro|135 f/2L|300 f/4L IS|430ex|BG-E2

  2. #2

    Default Forget about it...

    Quote Originally Posted by ST_sg
    While I'm doing post processing from RAW to jpg, I usually save it as 240dpi. Wondering what's your preference?

    Care to share your experience and any reasonable behind if to set the dpi too high eg.300dpi or too low eg.150dpi ?
    But, I can see the file size real make the different.

    All inputs welcome

    Thanks.
    Only important w.r.t. a printing device. Does not affect the pixels. Save whatever makes u happy.

  3. #3
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    Default

    many people are confused about the concept of dpi. dpi does not really matter for digital images. just make sure that the number of pixels correspond to your original source.

    dpi x length (in inches) x width (in inches) = number of pixels

    Unless you specify the length and width in inches as well, saving to a particular dpi makes no sense.
    Last edited by mpenza; 8th November 2004 at 04:58 PM.

  4. #4

    Default

    I save at 300dpi, coz my printer prints at 300dpi.

  5. #5
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    Default

    Doesn't matter. You can save as 1 dpi or 3000dpi and it won't make a difference as long as your pixel dimensions remain the same. e.g. 2048 x 1536 for a 3mp image.

    Regards
    CK

  6. #6

    Default

    Quote Originally Posted by ckiang
    Doesn't matter. You can save as 1 dpi or 3000dpi and it won't make a difference as long as your pixel dimensions remain the same. e.g. 2048 x 1536 for a 3mp image.

    Regards
    CK
    It matters only when u directly send your image to your PC printer.

  7. #7
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    Default

    Quote Originally Posted by AReality
    It matters only when u directly send your image to your PC printer.
    nope, it doesn't. changing the dpi and keeping the pixel dimensions doesn't change the image at all.

    However, some software require you to specific the print size and it "derives" the dpi from the specified print size. e.g. if you have a 2000x3000 pic, specifying a print size of 4 inch by 6 inch will result in a printed pic that contains 500 pixels per inch. Of course, you could also specify the dpi and the software derive the print size. DPI and printsize goes together, specifying one without the other makes no sense for digital images.
    Last edited by mpenza; 9th November 2004 at 12:18 AM.

  8. #8

    Default

    Quote Originally Posted by ckiang
    Doesn't matter. You can save as 1 dpi or 3000dpi and it won't make a difference as long as your pixel dimensions remain the same. e.g. 2048 x 1536 for a 3mp image.

    Regards
    CK
    How about a 6MP image at 2048x3072. What is the recommended dpi to save from RAW to JPG if I want to send for A3 prints?

    Thanks for your tips & time
    Canon 40D|17-55 f/2.8 IS|100 f/2.8 Macro|135 f/2L|300 f/4L IS|430ex|BG-E2

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