Cloud Optimized GeoTIFFs are shown pixelated

[kannes]

Describe the bug
Cloud-optimized GeoTIFFs are shown pixelated.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://geotiff.github.io/georaster-layer-for-leaflet-example/examples/load-cog-via-script-tag.html
2. The image shows pixelation:
   

Expected behavior
The library should pick the most appropriate overview imagery and by that the image should be rendered with less or "no" pixelation.

Desktop (please complete the following information):

• Firefox 84.0.1, no page zoom is set.

Additional context
I would guess that the wrong overview level is shown?

The example file uses 256x256 blocks. However in the HTML a resolution of 128 is used. Is that supposed to match? The parameter is not really documented in a way that is clear:

georaster-layer-for-leaflet-example/main.js

Line 33 in 9d3b10d

resolution: 64 // optional parameter for adjusting display resolution

Setting the resolution parameter to 256 makes it look good but I have no clue what that actually does.

[RLC92]

I want to second this notion, I would like more documentation on how this feature works, and if possible/necessary a way to render at native resolution.