Image: General support for 16bit color components

[fungos]

One major feature missing from this crate is the general support for 16 bits color components.
Before going forward with new Encoder/Decoder I believe this should be solved. I would try to tackle this, but seems a bit more of design issue, so maybe someone more experienced with Rust would be needed.

Relates to #426, #559 and #560.

[rennis250]

What is this status on this? What is required to finish this?

[polarathene]

+1 I'd like to process 16-bit PNGs(specifically greyscale).

[BartMassey]

Yes. I would like to generate 16bit grayscale images.

[SolarLiner]

Any progress on this? I also would like to generate 16-bit PNG images.

[polarathene]

There appears to be in this issues history/timeline directly above your comment, is a commit from what is presumably a fork(and perhaps a PR) addressing it?:

Support 16 bit per channel image buffers
Add 16 bit buffers for all 16 bit types in ColorType. Include these as supported types in DynamicImage. These 16 bit images are currently only supported with u16 representation; changing this would require specialization and macroing of color conversions.

Load 16 bit PNGs at full bit depth rather than squashing to 8 bit.

Found the relevant PR here. So once that's passed review cycle and been merged, just have to wait until the next release with it is made :)