Are 48-bit color depth lightmaps necessary?

I realized that all my lightmaps that are generated by the Unity exporter end up being PNGs with 48-bit color depth. Re-saving them as PNGs with 24-bit color depth doesn’t seem to make a visual difference.

Is there some underlying reason the 48-bit are necessary? I’d like to reduce the size of my project and re-saving the PNGs seems to be a good way to achieve that.

This can help creating a bit less artifacts by having a better precision.

The thing is in webgl they will be addressed as if they werer 24 :slight_smile: so I would try to avoid the extra size or rely on a format supporting bigger precision (at the expense of a potentially even bigger size)