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Megaybytes and Megapixels… Which size is best (and right) for you depends on a clear understanding of what a specific file size can be used for.
We measure image sizes in pixels, and depending on how you stack those pixels, will ultimately decide how large you can print the image. Megapixels (Mp) are simply the total pixels available in an image (measured in Millions of Pixels).
This should not be confused with Megabytes (Mb) – Megabytes refer to the actual file size if saved on a disk and has no correlation to the actual printable size of an image.
The following guidelines should help you in deciding which image size to buy.
(Keep in mind that larger files might take slightly longer to download, but you should try and get the images that match your client’s size requirements the best)
 | 3mp (1,800 pixels on the longest side) (electronic use)
At 600dpi it has a printable size of 5cm x 7cm
At 300dpi it has a printable size of 10cm x 15cm
At 150dpi it has a printable size of 20cm x 30cm | 
| 4-5mp (2,800 pixels on the longest side)At 600dpi it has a printable size of 8cm x 11cm
At 300dpi it has a printable size of 17cm x 23cm
At 150dpi it has a printable size of 34cm x 46cm |  | 5-6mp (3,000 pixels on the longest side)At 600dpi it has a printable size of 8cm x 11cm
At 300dpi it has a printable size of 17cm x 25cm
At 150dpi it has a printable size of 34cm x 50cm |  | 6-8mp (3,500 pixels on the longest side)At 600dpi it has a printable size of 9cm x 15cm
At 300dpi it has a printable size of 19cm x 29cm
At 150dpi it has a printable size of 39cm x 59cm |  | 8-10mp (3,800 pixels on the longest side)At 600dpi it has a printable size of 10cm x 16cm
At 300dpi it has a printable size of 21cm x 32cm
At 150dpi it has a printable size of 42cm x 64cm |  | 10-12mp (4,200 pixels on the longest side)At 600dpi it has a printable size of 11cm x 17cm
At 300dpi it has a printable size of 23cm x 35cm
At 150dpi it has a printable size of 47cm x 71cm |  | 12-16mp (4,900 pixels on the longest side)At 600dpi it has a printable size of 14cm x 20cm
At 300dpi it has a printable size of 27cm x 41cm
At 150dpi it has a printable size of 55cm x 82cm |  | 16-22mp (5,500 pixels on the longest side)At 600dpi it has a printable size of 15cm x 23cm
At 300dpi it has a printable size of 31cm x 46cm
At 150dpi it has a printable size of 62cm x 93cm |
Legend:
600dpi: Typically used for high quality glossy prints like varnished pamphlets and brochures, cards and hardcover books.
300dpi: Standard printing for books, magazines and brochures
150dpi: Mainly used for enlarged prints like newspapers and posters
(NOTE: except for our web-size images, we have a minimum short side limit of 2,000 pixels. Also keep in mind that these sizes are approximate, as the actual cropping of the image and the sizes produced by different cameras differ)
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