Megapixels - An Explanation of Megapixels and How They Affect Photos

Discussion in 'Digital Cameras' started by Abigail1, Oct 17, 2012.

  1. Abigail1

    Abigail1 Guest

    Camera manufacturers are fond of advertising cameras by the number o
    megapixels they have. But what exactly is a megapixel and how does i
    affect photos?

    A megapixel is 1 million pixels. Pixels are small squares that are pu
    together like pieces of a puzzle or mosaic to create your photographs
    The resolution of your image will be determined in large part by ho
    many of these tiny squares are packed together in a small space.

    An 8 megapixel camera (8MP) would have roughly eight million tin
    squares of information per inch while a camera phone at 1.5 megapixel
    (1.5MP) would only have one and a half millions squares of informatio
    in an inch.

    So what does that mean for your photos?
    Simply put, the more information the better. The more informatio
    squeezed into an area, the better our eyes blend the edges together t
    create a complete image. If too little information is available the ey
    will notice the jagged edges of the pixels where they meet, just as yo
    see the individual squares of mosaic tile designs. The accepte
    "standard" for printing images is currently 300dpi (dots per inch)
    While dots per inch aren't technically the same as pixels per inch th
    difference won't affect you in your day to day photo taking/printing.

    How much information do I need?
    To figure out how much information you need for a specific print siz
    all you need do is multiply the print size by the resolution desired
    For example, with the 300dpi rule in mind, to print an 8x10 photo yo
    would need 2400 pixels by 3000 pixels of information. If you wer
    displaying an image on the internet (where 72 pixels per inch i
    acceptable) you would only need 576 pixels by 720 pixels.

    So how many megapixels do I need?
    Each camera displays data in slightly different ratios but there ar
    some "rules of thumb" you can follow. Decide what the largest size imag
    you will want to print. For most people this will be an 8x10 image
    Determine the number of pixels needed for a 300dpi print (2400x3000 fo
    an 8x10). Next multiply the two pixel dimensions together. For an 8x1
    this comes out to 7.2 million pixels, or 7.2 megapixels. This is th
    preferred number of MP you need if an 8x10 print is the largest you ar
    likely to print
     
    Abigail1, Oct 17, 2012
    #1
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  2. Abigail1

    jdanield Guest

    Le 17/10/2012 08:27, Abigail1 a écrit :
    it's not for an inch, anyway the sensor is a surface it could be
    square inch, but it's neither.

    its the number of pixels for the hole sensor surface, with no respect
    of it's size.

    A 8Mpix sensor can be Full frame, APS-C, mini...

    jdd
     
    jdanield, Oct 17, 2012
    #2
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  3. Abigail1

    Rob Guest

    Where did you get that garbage from?
     
    Rob, Oct 18, 2012
    #3
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