How To Determine Camera Pixel Size

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If you only know the pixel count (i.e. the number of megapixels) that a digital camera has, it's simple to calculate the linear resolution from it (i.e. the width and height of the resulting images) if you know the camera'due south aspect ratio. We're going to be using an imaginary 12-megapixel digital SLR with a iii:2 aspect ratio in our examples.

Steps

1
Observe out the aspect ratio of your camera. Here are the two most common:
- 3:2, or iii horizontal pixels for each 2 vertical pixels, is typical for digital SLRs.
- iv:three, or 4 horizontal pixels for each 3 vertical pixels, is the attribute ratio used by about compact (signal-and-shoot) cameras in their still style.
2

Convert your megapixel count to a total pixel count by multiplying it by i million, if necessary.

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3

Get a horizontal-to-vertical and vertical-to-horizontal ratio. You go the horizontal-to-vertical ratio by dividing the kickoff office of your aspect ratio by the 2d; you get the vertical-to-horizontal ratio by dividing the second part of your aspect ratio by the third. In our 3:2 digital SLR example:
4

Multiply your pixel count past the horizontal-to-vertical ratio, then separately, by your vertical-to-horizontal ratio.
5

Take the square root of your resulting numbers.
half-dozen

You at present have the resolution of the camera. In the example of our imaginary digital SLR, it was 4243 x 2828.
7

Finished.

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Question

How practice I catechumen a screen's resolution into megapixels?

You demand to multiply the width past the summit and then split up by one,000,000. For case, if you wanted to summate the megapixels in a 1920x1080 screen, you would multiply 1920 past 1080 to become 2,073,600. When yous divide that by 1,000,000, y'all become 2.07 megapixels.

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If you effort this with multiple resolutions, you'll notice how little absolute pixel counts (i.e. the number of megapixels) matters. For instance, a 24 megapixel (6000x4000) camera will only give you twice the linear resolution of a six megapixel (3000x2000) camera, and consequently, prints only twice as wide at any given printing resolution. And, if your pictures with the six-megapixel camera aren't pixel-perfect--many very nice ones aren't--there would be no improvement.
Y'all can use this to find out the largest near-perfect-quality impress you can make from whatever camera by dividing your resulting numbers by 300; the resulting number is a size in inches. (300 dpi is more-or-less indistinguishable from optical printing from moving picture; y'all can plug in dissimilar figures depending on the dots-per-inch required for your needs.)
Remember that pixel counts given by manufacturers are not exact and are often rounded up rather than downwards. Nor are aspect ratios necessarily exact. Any resulting figures should be taken with the appropriate amount of table salt.
- A camera advertising "pixel" is by and large not the same as a monitor "pixel". The latter is a point with distinct values for each component color (unremarkably cherry-red, greenish and blue); the former is generally a point on a sensor that has a distinct value for one color and no information for the other colors, with colour sensitives alternate from i pixel to the next.^[1] The final image is made by interpolating each monitor pixel from these overlapping color separations, forming a full-color pixel for each original unmarried-colour pixel. That can exist done intelligently, but the result isn't quite perfect viewed at 100% on a monitor. (A Foveon sensor captures each color for each photosite, merely has a few merchandise-offs.)
- Poor technique such equally camera shake, high-ISO noise or smoothing to become rid of information technology and poor lens quality (which is mutual in super-small-scale cameras but tin be mitigated with small-scale apertures) reduces the level of actual detail far beneath the number of pixels recorded.