Just as a point of interest: If you're willing to pay the cost for a really good resampling algorithm, you can use a Gall-Peters projection. It's equal area i

Just as a point of interest: If you're willing to pay the cost for a really good resampling algorithm, you can use a Gall-Peters projection. It's equal area instead of equal angle, so each pixel holds the same amount of surface area from the spherical image. Doing this, you could get a 2/Pi savings from the uncompressed image. https://en.wikipedia.org/wiki/Gall%E2%80%93Peters_projection https://en.wikipedia.org/wiki/Gall%E2%80%93Peters_projection However, it's easier to get good results with the equirectangular projection.