Indexed graphics for retro engine?

[Shadowblitz16]

On Thursday, 19 September 2019 at 05:22:37 UTC, Mike Parker wrote:
> On Thursday, 19 September 2019 at 03:47:05 UTC, Shadowblitz16 
> wrote:
>> Is there a way to make a indexed graphics library that can 
>> handle importing and exporting true color images?
>
> I don't see why not.
>
>>
>> I would guess something like this could be simulated with 
>> pointers and references right?
>
> If you want to, say, take a 24-bit or 32-bit and treat it as an 
> 8-bit image, you'll probably want to actually do a conversion 
> rather than a simulation. In which case you'd probably be 
> better off just using an existing C library like FreeImage. You 
> can find a binding here:
>
> https://github.com/BindBC/bindbc-freeimage
>
> Otherwise, you'll want to hit up a graphics programming forum 
> for resources on image conversion. Two possibilities:
>
> https://www.reddit.com/r/GraphicsProgramming/
>
> https://www.gamedev.net/forums/forum/5-graphics-and-gpu-programming/

I wanted to do 4bpp 16 color graphics.
and I didn't want to load anything unnecessary in the image like 
the palette but instead supply it myself as a Color[16];