DPI for jpeg

Discussion in 'Digital Discussion & Q&A' started by indigenous, Nov 15, 2006.

  1. indigenous

    indigenous TPF Noob!

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    I just got a D200 and i am shooting at the biggest jpeg file, uncompressed, and at optimal quality. When i open the profile in PS the file only has a dpi of 75. Is this correct? am i doing something wrong? I know that RAW is a bigger file and it has a dpi of 300, but is the largest jpeg file really that far behind?
    Is there anything i can do to improve the jpeg quality?
     
  2. Mohain

    Mohain TPF Noob!

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    It doesn't matter what frequency your image is, it matters what the overall pixel width is. e.g. a 3872 px image will print at 13" wide at 300DPI. If you want to print at 200DPI then you will be able to print 19" wide, etc, etc ...
     
  3. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    DPI (Dots per inch) is a printer setting.

    PPI (Pixels per inch) is used to size an image on the screen. As mentioned, what really matters is the actual size of the image...measured in pixels.

    A large JPEG and a RAW file should be the same size (in pixels)...but the file size should be different.
     
  4. Digital Matt

    Digital Matt alter ego: Analog Matt

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    DPI is the last step in printing, and it tells the printer how close to print the dots together.

    Pixel Dimension / DPI = Size in inches.

    A 300 x 300 jpg will print at 1" x 1", at 300 dpi, or 4.16" x 4.16" at 72dpi.
     
  5. indigenous

    indigenous TPF Noob!

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    so what should i print an 8x10 at to get the best possible image? should i even change the dpi or just the size of the image in PS?
     
  6. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    When I make an 8x10 print...I set the size to 2400x3000 pixels.

    Here is a tip...you can use the crop tool in PS. When you activate the crop tool, you can set the aspect ratio and 'resolution'. 4x6, 5x7 & 8x10 (@ 300 PPI) should all be presets that you can select from the drop down.

    Then when you crop the image...it is set to the correct aspect ratio and size for printing.
     
  7. indigenous

    indigenous TPF Noob!

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    i guess i was used to scanning film, when it asks you what dpi you want it scanned @.
    when you shoot do you use jpeg or raw? i noticed raw images were preset @ 300 dpi when i open them and jpeg @ 72. i guess it just threw me off.
     
  8. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    I shot either large/fine JPEG or RAW....RAW mostly.

    Don't feel bad...people have been getting confused about this for several years. It's just a number...You can change the PPI setting to 10000 if you want...it won't change the image (unless you resample it).
     
  9. markc

    markc TPF Noob!

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    Even resampling doesn't help all that much. There is some argument to that, as some people suggest resampling up in steps to get a better prints, but when it comes right down to it, you can't add data. Use the original size to help determine if the pixel x pixel size is large enough for the inch x inch size you want to print at. You can experiment for yourself to see if resampling up will actually give you a better print on your equipment. A lot of the times it just makes for a larger fille.
     
  10. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    Good point...and if the image you want to print, is larger than your pixel size/300...you can still get a good image. 300 PPI is just a standard number. Some people print from 240 PPI etc. It's up to you to decide what is acceptable to you.
     
  11. Digital Matt

    Digital Matt alter ego: Analog Matt

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    Check with your printer before you go sending images less than 300 dpi. A lot of photo printers print at 300 dpi.
     
  12. indigenous

    indigenous TPF Noob!

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    The printer is cool, ive been useing it for a while. This is just my first expedition into digital photography. I guess ill just shoot raw images. I liked the fine jpeg, but raw just looks sharper, less images per memory card, but better quality.
     

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