What determines the amount of MB in a photo?

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VINTAGE MUSIC

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Sending my brother photos via Yahoo E-Mail. It shows some are 6.1 MB, 5.3 MB, 5.6 MB, etc. Settings on camera stay the same such as megapixels, file size. What I change is aperture and focal length.
On the same subject, I wanted a nice photo as an avatar but Yahoo says it's 6.1 MB, can't be done. Not over 5 MB. Any ideas? How do I determine MB from one photo to another?
I keep camera at 12.1 megapixels, yet transferring shots to computer it's JEPG.
So, yet except for ISO setting I'm not changing anything but amount of MB is all over the map.
I keep camera at 12.1 megapixels, yet transferring shots to computer it's JEPG.
So, yet except for ISO setting I'm not changing anything but amount of MB is all over the map.
 
Your ISO setting could affect the size of the photo, as could the amount of complexity (a fully white photo takes up much less space than a complex one, because JPEG is compressed).

To shrink a photo's size on disk - save it in your favorite image editing software, and lower the quality.
 
Your ISO setting could affect the size of the photo, as could the amount of complexity (a fully white photo takes up much less space than a complex one, because JPEG is compressed).

To shrink a photo's size on disk - save it in your favorite image editing software, and lower the quality.
 
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