Why do Photos All Have Different Data Sizes?

[chrislitzkow]

Just curious... I took several photos this weekend, all at 3MP and without changing any camera settings. Some photos are 1.01 MB, 864 KB, 1.16 MB, 1.07 MB, etc...

If all settings are the same, why would the sizes be different? Thanks!

 

[jdaly]

It all depends on what you're taking a picture of. Take a picture of a blank wall and then take a picture of something with plenty detail and colors. You'll noticed much better file compression for the blank wall shot.

 

[Adiliyo]

it has to do with the amount of compression in the picture, and that has to do with the color composition of the image itself, the more the jpeg container can compress the image, the smaller it will be,

megapixels are simply a dimensional value, they will all be the same 2048 by 1536 (or thereabouts) in pixels

 

[ThatRandomGuy]

It depends on the picture content(and pixel layout).