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Exposure : Aperture : Shutter Speed : Composition : ISO : White Balance : Flash : Mega pixels


Megapixels

In a world obsessed with numbers:

MP camera sensor

The first tip is don’t be obsessed with the number of Megapixels (MP) your camera has; a 12MP Nikon D90 with a decent lens will give you sharper, clearer images than a 14MP Nikon D3100. The combination of Lens, Sensor type, Processor and Software dictate the image quality, not just the largest MP rating; you’ll find endless cheap compact cameras that boast huge amounts of pixels, but with cheaply made plastic lenses you’ll soon see why they are so cheap.

Megapixel simply stands for 1 million pixels on a sensor, a 1000 x 1000 cube of sensors. Or to continue with the Nikon D90 analogy
4,288 × 2,848 pixels = 12.3MP

These examples are taken from the original shots below and represent how the pixillation would look like when printed at A2 (approx. 60cm x 42cm)


2MP on the left, on the right 4MP
2MP Example4mp Example
ferrari imagenice image
Venice imagevenice boat image
6mp Example10 Example
6MP on the left, on the right 10MP


The number of MP are important but there is no substitute for a good lens and a reliable manufacturer.


MP – Megapixel, DPI & Printing


It is still the convention within the printing industry to use inches rather than centimetres, that is why we measure the resolution /quality of printing in Dots Per Inch - DPI

When choosing the image size on your camera and when editing images on Photoshop, you need to understand how the size of your image in pixels will translate into a printed picture.

For most purposes 300dpi is considered a good enough resolution for printing photographs. This is the standard resolution used in most magazines and books.

To create an A4 image at 300dpi, you need to use a camera with around 10MP or an image in pixels around 3508 x 2480. However, the A4 page is unlikely to match the dimensions of your image, so refer to the table at the bottom of this page for more measurements and guidance.


D215 pixel chart


Each coloured box represents a certain number of megapixels. The numbers along the top and left side are print dimensions in inches at 300 dpi.

Megapixels vs. Maximum Print Size Chart
215 table
*Typical Resolution. Actual pixel dimensions vary from camera to camera.
**At 150ppi, printed images will have visible pixels and details will look "fuzzy".


Source of charts: http://www.design215.com/toolbox/megapixels.php



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