Image Size: 800x600
File Size: 81k - 16 times smaller than the filesize of the original
Image Size: 640x480
File Size: 52k - 25 times smaller than the filesize of the original
More comparisons below:
Image Size: 480x640
307,200 pixels
File Size: 56k
Image Size: 600x800
480,000 pixels
File Size: 77k
Image Size: 768x1024
786,432 pixels
File Size: 106k
Image Size: 1200x1600
1,920,000 pixels
File Size: 161k
Image Size: 2272x1704
3,871,488 pixels
File Size: 272k