Comment by JyrkiAlakuijala

I designed the lossless format and its initial encoder. Zoltán Szabadka wrote the initial lossless decoder.

On2 Technologies had designed the lossy format and its initial encoder/decoder. Skal improved on the encoder (rewriting it for better quality, inventing workarounds for the YUV420 sampling quality issues), but did not change the format's image-related aspects that On2 Technologies had come up with for VP8 video use.

In the end stage of lossless productization (around February 2012) Skal had minor impact on the lossless format:

1. He asked it to have the same size limitations (16383x16383 pixels) like lossy.

2. He wanted to remove some expressivity for easier time for hardware implementations, perhaps a 0.5 % hit on density.

Skal also took care of integrating the lossless format into the lossy as an alpha layer.