How Many Me­gapix­els Do You Re­ally Need?

HWM (Malaysia) - - LAB TEST -

How many me­gapix­els do you re­ally need? The ideal an­swer is as many as you can get your hands on while re­tain­ing im­age qual­ity, but a more prac­ti­cal an­swer is to de­cide based on your fi­nal out­put. The larger your photo needs to be even­tu­ally seen, the more me­gapix­els you’ll need.

To get an idea of how large you can print a dig­i­tal im­age with good im­age qual­ity, di­vide the length and breadth of the im­age’s res­o­lu­tion by the pix­els per inch (PPI) you want to print at – 300ppi is a good qual­ity num­ber, but it is also pos­si­ble to print pho­tos above or be­low that num­ber.

For in­stance, a 10MP im­age with a res­o­lu­tion of 3872 x 2592 pix­els would let you print at a max­i­mum size of 12.9 x 8.64 inches at 300ppi (3872 and 2592 each di­vided by 300), or ap­prox­i­mately A4 size, with good im­age qual­ity.

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