Hello Dwight:
I would first try just switching to a while background, and see how that works? Frankly, with just a few exceptions (which depend mostly on your monitor/projector), I have found that colors that work well in the white background -- also work great with a black background.
So, if you switch to a white background, and tweak the yellow, brown, and green (at least), and save that RGB file (Projector.RGB ?), I'll bet this is all you need. Are you using all 255 colors? Do you have the projector set to 16bit color?
After that, if you still need to change all the colors to black, then you can do this most easily by editing the RGB file in a text editor. Just mimic the format, and paste all the colors as 255, 255, 255.
Here's my tweaked RGB that works very well on a white background:
0 0 0 Color_0
0 0 0 Black
255 0 0 Red
0 139 20 Green
0 0 255 Blue
0 170 170 Cyan
170 0 170 Magenta
195 91 0 Brown
170 170 170 Lt Grey
100 100 100 Dk Grey
255 131 141 Lt Red
85 255 85 Lt Green
123 148 247 Lt Blue
85 255 255 Lt Cyan
255 85 255 Lt Mgta
225 172 0 Yellow
[edit] just the first bits are my custom colors -- the rest are the same as yours...[/edit]
It's a good place to start, anyway!
You can Copy & Paste it into NotePad...