How do I reduce an image size in MB's

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i want enter image online competition size needs less 3 mb.  of images seem larger this.  how reduce size of image in either elements or iphoto?  confused different ways of measuring images.  want make image less 3 mb

does online competition page give size in pixel dimensions or other guidelines besides less 3 mbs?

if under 3mb, that's vague can compress rather big image under 3 mbs terrible.



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