John_F Loc: Minneapolis, MN

If you know the pixel dimensions of the image (W x H) and the bit depth per pixel (D) then the minimum file size in bytes of WxHxD/8. Every file has a header that contains information of necessity to the reading device, such as a computer. People who are familiar with file headers can explain.

blackest Loc: Ireland

Doesn't really work that way, once the image is converted to a bitmap generally its 8 bits per color channel or 24bits.
for a 16bit tiff its 48 bits (thats 3 or 6 bytes per pixel)

width and height would give the mega-pixels used e.g 6000 x 4000 = 24 million or 24 mega pixels for 8 bits that would be 72 million bytes and 144 million bytes for 16 bit per channel.

For raw at 12 bits per pixel site (same dimensions 6000 x 4000) it would be around 36 million for the same sensor + a bit more for the pixel sites around the edge of the sensor + header information. in practice file sizes are much smaller using lossless or lossy compression techniques.

SteveR Loc: Michigan

Does pixel size affect file size?

Rongnongno Loc: FL

John_F Loc: Minneapolis, MN

When you transfer your image files to computer storage, how large does the computer OS say the file is. A 6000 by 4000 pixel raw image from my Sony a6300 in my Mac occupies about 25 megabytes. Therefore te pixel bit depth can not exceed 8 (1 byte).

Apaflo Loc: Anchorage, Alaska

You are not considering how much that file is compressed. Therefore the pixel bit depth is significantly greater than the 8 bits you suggest.

Sony says the a6300 shoots in either 14 bit or 12 bit mode, and it is not possible to generate an 8 bit depth RAW file.

bkyser Loc: Fly over country in Indiana

Wow, this ended up a lot "deeper" than I thought. I will admit, I'm enjoying the reading, and the fact that nobody is attacking each other on a personal basis. I could get used to this.