SP3000

[DrewsFilmLab]

When I export a set of photos from MS01 4.2 as TIFF, they’re all the same size. Any help with this? Shouldn’t they be different size files based on image content?

[Calebsavage]

TIFF files aren't compressed, so they should be the same size for every picture. The size is determined by the number of pixels and the number of bits per channel. Each pixel has 3 channels. Each channel has 8 bits, so each pixel is 24 bits.

So if you have an image that is (for example) 2400 x 3600 px, you have 8,640,000 pixels in total, at 24 bits per pixel you'd get about 207 million bits. A byte is 8 bits, so we divide by 8 to obtain 25,920,000 (twenty five million) bytes, or 25.9 megabytes. 

A regular TIFF file is a "bitmap", it's simply a list of the numeric values for each color channel of each pixel with a bit of metadata baked in.

JPEGs vary in size because the compression can be more or less efficient based on image content. In the simplest terms, image compression works by abbreviating repeated values. So when there's a large area of one color in the picture, we can say "1000 green pixels" in a JPEG instead of repeating the numeric value for a green pixel 1000 times as we would in a TIFF.