Realize also that the main point of the EnvSphere is not to look at directly. It is to provide lighting for IDL, and something to reflect for shiny objects.

If all you want is a clean background image, then don't bother with the sky sphere. Find a nice sky photo, an ordinary photo. Load it onto a Poser one-sided square. Set the shader up same as the one for the environment sphere. (The shader will work on any object, not just the sphere.) Then you still can manipulate saturation and contrast, but it can be done with any image, not just an equirectangular one.

You then scale the square in x and y until it has the same aspect ratio as the original image. I usually just type the image dimenions into the scale factors. So if my image is 800 by 600, I use xScale=800 and yScale=600. Then I may adjust the overall size of this rectangle use the master Scale. Then position it behind your subject. It works great for backgrounds.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)