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Thread: 72dpi? not 300dpi?

  1. #1

    Default 72dpi? not 300dpi?

    hi everyone.
    I am pondering over this question.
    my horizontal and vertical resolution is 72dpi straight out from my 450D at the highest JPEG quality. shouldn't it be 300dpi?

  2. #2
    vince123123
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    Default Re: 72dpi? not 300dpi?

    DPI is just a set of instructions to be sent to a printer. Where you print 72dpi, it will print 72 dots in one inch. At 300, it will print 300 dots in one inch. This has no measure on the actual number of pixels your image contains.

    Viewing on screen, it makes no difference. If it bothers you, simply go to PS and adjust from 72 to 300, but be sure to uncheck Resample Image.

  3. #3

    Default Re: 72dpi? not 300dpi?

    Quote Originally Posted by HTCahHTC View Post
    hi everyone.
    I am pondering over this question.
    my horizontal and vertical resolution is 72dpi straight out from my 450D at the highest JPEG quality. shouldn't it be 300dpi?
    It doesn't matter. dpi is just the relationship between the print size and actual picture dimension in pixels.

  4. #4

    Default Re: 72dpi? not 300dpi?

    Quote Originally Posted by vince123123 View Post
    DPI is just a set of instructions to be sent to a printer. Where you print 72dpi, it will print 72 dots in one inch. At 300, it will print 300 dots in one inch. This has no measure on the actual number of pixels your image contains.

    Viewing on screen, it makes no difference. If it bothers you, simply go to PS and adjust from 72 to 300, but be sure to uncheck Resample Image.
    oh!
    thanks for the info!

  5. #5
    Senior Member
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    Default Re: 72dpi? not 300dpi?

    depends on your screen as well... screens also have a dot pitch... which some are sharper than the other due to smaller and nearer dots. most picture viewer or editor will scale picture down to show full screen or to certain percentage. like if your pic is 3000x2000, your monitor display 1920x1200, its impossible to do a 1:1 unless u wanna lose some parts, so it will be reduced to 1920x1200 full screen or to the window size of say 800x600 if the window box is this size.

    to print, it depends on the printer you use. 300/600/1200/1440 etc dpi.
    Logging Off. "You have 2,631 messages stored, of a total 400 allowed." don't PM me.

  6. #6
    Member
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    May 2003
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    Singapore, Singapore, Singapor
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    Default Re: 72dpi? not 300dpi?

    A very simplified way of understanding it is to think of your photo as being made up of dots. My maths is bad, so forgive me if I get my numbers wrong, but more or less this is the explanation. So for example your photo is made up of 7200 dots, if you print at 72 dpi, then your photo can be 10x10 inches square in size, and contain 72 dots per square inch. But if you print at 300dpi, then those same 7200 dots that make up your photo will be compressed into 300 dots per square inch, so your resulting image size that is printed out will be smaller than if you printed at 72 dpi. Please note that my explanation is very very simplified and the terms I used are not technically accurate, but more or less that is the layman explanation.

  7. #7

    Default Re: 72dpi? not 300dpi?

    In case you still want to shoot at 300dpi, use raw format. It should give you 350dpi.

  8. #8

    Default Re: 72dpi? not 300dpi?

    thanks everyone!
    really appreciate it.
    and yeah, i can convert my RAW images to 350dpi in DPP.
    thanks once again!

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