SneakerG,
While I would never presume to speak for guru Chris Cox, who has been writing Photoshop code for some 16 years or so, the fact that I have no connection to Adobe allows me to agree with you publicly that the Image Size dialog box appears indeed to be mislabeled on its face. That "15.2 M" figure should read 15.2 MB.
The pixel dimensions are evident: 2800 pixels wide x 1900 pixels high = a 5.32 Megapixel image file.
Now, to get the Megabytes you multiply the 5,320,000 pixels by 8 bits x 3 channels.
http://en.wikipedia.org/wiki/Megabyte
The megabyte is a multiple of the unit byte for digital informationstorage or transmission with two different values depending on context: 1048576 bytes (220) generally for computer memory;[1][2]and one million bytes (106, see prefix mega-) generally for computer storage.[1][3] The IEEE Standards Board has decided that "Mega will mean 1 000 000", with exceptions allowed for the base-two meaning.[3] In rare cases, it is used to mean 1000×1024 (1024000) bytes.[3] It is commonly abbreviated as Mbyte or MB (compare Mb, for the megabit).
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Wo Tai Lao Le
我太老了
