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Thread: How many pixels I need?

  1. #1

    Default How many pixels I need?

    Hello all,

    Have been wondering: if i wanna print an A4 size pic, how many pixels do I need to get an good pic?

    Thanks!

  2. #2

    Default Re: How many pixels I need?

    Originally posted by rapidmax
    Hello all,

    Have been wondering: if i wanna print an A4 size pic, how many pixels do I need to get an good pic?

    Thanks!
    Photo Quality printing is 300 dpi ( dot per inch )
    A4 = 8.3 x 11.7in
    = (8.3 x 11.7) x 300
    = 2490 x 3510
    = 8739900
    = 8.74 megapixel
    so it is abt. 8.74 megapixel to print an A4 size pic in 300 dpi.
    See my Photo Gallery at the Clubsnap

  3. #3

    Default Re: Re: How many pixels I need?

    do note that you can get decent A4 sized prints even from a 3.3Mp camera.

    otherwise, you can interpolate your images in PS.

  4. #4

    Default

    Does interpolation means that your image quality is lost? how does it work?

  5. #5
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    Default

    A measely 2mp camera can already do decent 8x10 (close to A4) prints.

    Interpolation is just a technique for inventing something from nothing (in this case, making up pixels from nothing, based on other pixels).

    Regards
    CK

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    Default

    Originally posted by ckiang
    A measely 2mp camera can already do decent 8x10 (close to A4) prints.

    Interpolation is just a technique for inventing something from nothing (in this case, making up pixels from nothing, based on other pixels).

    Regards
    CK
    Yep. Second that.

  7. #7
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    shooting at 1600 X 1200 =1920000
    File Size = 1920000 X 3 =5.76MB

    Image dimension = (1600 / 72) X (1200 /72) = 22.22 Length X 16.6 Breath

    If u wanna print e pic wif a printer having 200 DPI output-resolution, change yr image of 72 DPI to 200 without re-sampling e image n e picture dimension will change to:
    (1600 / 200) X (1200 / 200) = 8" X 6"
    Of cos U can print a larger pic by re-sampling or interpolation but in throry, it will degrade e pic.
    wif gd re-sampling software, e degradtion is negligible but work within the range of 6 to 6 times e original pix dimension. Thus. u could hv a print size up to 18" X 24" taken by a high end consumer camera n a print size as big as 36" X48" taken by a professional high end camera

  8. #8
    Senior Member ivor's Avatar
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    Default Re: How many pixels I need?

    The general rule is,

    1MP - 3" X 5" Print

    2MP - 5" X 7" Print

    3MP - 8" X 10" Print

    4MP - 9" X 12" Print

    5MP - 10" X 14" Print


    Originally posted by rapidmax
    Have been wondering: if i wanna print an A4 size pic, how many pixels do I need to get an good pic?

  9. #9

    Default

    hi,
    Is there any difference in quality printing 4R if I use 3.3MP compared to 6.1MP?

    TIA!

  10. #10
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    Default Re: Re: How many pixels I need?

    Originally posted by ivor
    The general rule is,

    1MP - 3" X 5" Print

    2MP - 5" X 7" Print

    3MP - 8" X 10" Print

    4MP - 9" X 12" Print

    5MP - 10" X 14" Print
    There's quite a big jump from 2MP to 3MP. 3MP contains 50% more pixels but according to the general rule, could print more than twice the area.
    Check out my wildlife pics at www.instagram.com/conrad_nature

  11. #11
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    At the risk of sounding like a show-off....

    Go down to Kim Tian Color Centre and see the cat prints they put up lor. Those are 2mp shots (up to 10R).

    Blk 531 Upper Cross St
    #01-06 Hong Lim Complex
    Singapore 050531
    Tel : 6538-1422

    Or you can go over to my friend's lab at Bt Batok
    Miao Lann Colour Centre
    Blk 154 Bt Batok St 11
    #01-302 S(650154)
    Tel : 6425-0239
    Ask for Kelvyn or Alfred

    Ask to see Azure's prints. Easy way to settle, no?

  12. #12
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    Originally posted by E-Lim
    hi,
    Is there any difference in quality printing 4R if I use 3.3MP compared to 6.1MP?

    TIA!
    The difference will be negligible.

    Regards
    CK

  13. #13
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    Originally posted by Azure
    Yep. Second that.
    With all the camera manufacturer's marketing flak, now every other person think that you need a 6mp++ camera to do 8x10/A4 and that 2-3mp cameras are useless at achieving that.

    I still remember in the good old days, the marketing flak of 2mp cameras say "Print up to 8x10"

    The proof is always in the final print. A well captured and processed 2mp shot can indeed be printed to at least 8x12" (I've been there done that). I've also successfully printed 10x15" from a 3mp camera.

    Regards
    CK

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    Yup, CK, that's why I loved my late 950 so much.

    Of course, basics of a well-taken pix will have to be there lah. If one gets a 6Mp cam and takes a bad shaky shot, even 3R size may not hide it.... Then again, a good 2Mp shot can suffice even for offset printing. Have seen some of my clients use 2-3Mp shots and they turn out better than re-scanned 4Rs in their annual mag.

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