As to your original posted question, I am not sure anything can be done about the issue of references being gray appearing too difficult to see. Like yourself, I too find using the black background to be more beneficial. I have seen many 3D programs just watching "behind the scenes" stuff on movies that show black or grey backgrounds. Eye strain IS an important issue. Wether people recognize it or not, eye strain (for me anyways) is mentally stressing. As for prints go, I work with a black background but my image and sheet layouts still appear white with black lines. So I have no trouble at all distinguishing what the print will look like before it goes to the plotter; albeit, sometimes the lineweights are a little tricky to discern until it IS printed. Another reason I prefer the black background... my disablility. I have epilepsy which, with medication, is for the most part kept in check. But all day I am working on the computer and under bright lights. So this creates a visual strain for me in particular. Not to mention my kitchen has the same type of lights. So when I am working on the computer for long hours at a time I do have some minor problems, same for at home and when working with my laptop. Again, see my comment about light being mentally stressing. And think about the colors. Monitors generally use Red, Green, and Blue colors to show the various colors you are seeing. White is a combination of all colors seen. Of those colors, studies have shown that yellow can lead to headaches and red can lead to other effects that may be, to some, undesireable. I have known others that cannot view the color red without headaches or suffer seizures of some minor sort. So there IS some merit to what WYS1WYG is stating about eye strain. And I understand I may be an exception in this particular case, but some of the reasons I have explained do pertain to a majority of people. But that is why I prefer using a black background.
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