How is it that two different images, but same resolution, can have different storage size?
In: Technology
Compression is crucial, but don’t forget bit depth — the number of bits used to represent the color of each pixel. This occurs most often in the post-production and photography worlds, before compression happens for a deliverable product.
An 8-bit image uncompressed will take 1/3 of the size of a 24-bit image (8-bit each for “R, G, and B “) , uncompressed, at the same resolution. Some image formats like TIFF support an alpha (mask) channel, making another 8 bits per pixel of data.
So your file size can vary greatly depending on the number of bits used to describe the color of each pixel, well before you ever compress the image ( see other replies).
Many modern cameras can deliver 10-bit per pixel images or video frames, which have 30 bits per pixel (uncompressed.)
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