Re: Megapixels - An Explanation of Megapixels and How They AffectPhotos

Discussion in 'Digital Photography' started by Rob, Oct 18, 2012.

  1. Rob

    Rob Guest

    On 17/10/2012 5:27 PM, Abigail1 wrote:
    > Camera manufacturers are fond of advertising cameras by the number of
    > megapixels they have. But what exactly is a megapixel and how does it
    > affect photos?
    > A megapixel is 1 million pixels. Pixels are small squares that are put
    > together like pieces of a puzzle or mosaic to create your photographs.
    > The resolution of your image will be determined in large part by how
    > many of these tiny squares are packed together in a small space.
    > An 8 megapixel camera (8MP) would have roughly eight million tiny
    > squares of information per inch while a camera phone at 1.5 megapixels
    > (1.5MP) would only have one and a half millions squares of information
    > in an inch.
    > So what does that mean for your photos?
    > Simply put, the more information the better. The more information
    > squeezed into an area, the better our eyes blend the edges together to
    > create a complete image. If too little information is available the eye
    > will notice the jagged edges of the pixels where they meet, just as you
    > see the individual squares of mosaic tile designs. The accepted
    > "standard" for printing images is currently 300dpi (dots per inch).
    > While dots per inch aren't technically the same as pixels per inch the
    > 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 size
    > 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 you
    > would need 2400 pixels by 3000 pixels of information. If you were
    > displaying an image on the internet (where 72 pixels per inch is
    > 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 are
    > some "rules of thumb" you can follow. Decide what the largest size image
    > 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 for
    > an 8x10). Next multiply the two pixel dimensions together. For an 8x10
    > this comes out to 7.2 million pixels, or 7.2 megapixels. This is the
    > preferred number of MP you need if an 8x10 print is the largest you are
    > likely to print.

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