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