Those 14 bits

Started Jan 17, 2014 | Discussions thread
seachicken2000 Veteran Member • Posts: 3,228
Re: NEX-7 is 14-bit

Iliah Borg wrote:

seachicken2000 wrote:

Iliah Borg wrote:

Delta encoding is a lossy compression.

Why is it lossy?

Because in a 16-byte block for 16 pixels they have 11 bits for minimum, 11 bits for maximum, 2 4-bit indices of the locations of minimum and maximum values in the block and 14 7-bit deltas from minimum. So, if you have the amplitude of less than 128, it is lossless. But if you have a sharp edge with larger amplitude it is lossy.

The details are interesting, thanks.

If I understand it correctly areas of flat tone will be encoded without error. Areas that contain large differences in amplitude will have errors in their values.

The errors in these values are random in nature, and so will manifest themselves as noise around contrasty features? If so is this noise going to be visible in real images?

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