frank678 said:

So the light blue sky was always already blown out somewhat on the technidisc master anyway - by the (contrast?) settings used by the operator?

Yes, there's some clipped whites in the Technidisc master where the GOUT actually fare better but overall it's not as bad, some examples of clipped whites can be seen when the stormtroopers blow up the hatch on the blockade runner, in the attack of the sandpeople and the subsequent scenes following it with Ben, and somewhat in these Mos Eisley scenes, but part of why the sky look like it does here is because there exist almost no blue in the highlights at this point, it can be corrected:

I may have adjusted the green midtones a tad too much though but you get the idea.