It depends how detailed the picture is
how many pixels are in 700K
About 500
it is 150xa50 pixels.
4mb photo
12 pixels tall 12 pixels wide.
786432 pixels
0.48
0.3 megapixels
To find the number of pixels in an image, multiply the width of the image in pixels by the height of the image in pixels. This will give you the total number of pixels in the image.
10.2mp = 10.2 mega pixels
720 is 0.9 mega pixels.
2.4mp