Works fine for me.
If you have something like 0, 200, 128 you just put in the 0, answer whether you want to look in images, then click the search box, enter the next number with a space (0, 200), then the third value with a space (0, 200, 128) and it will show anything with those rgbs. The search box will look like 0, 200, 128. Really
Sometimes it is too sensitive. If you try to enter 128 + do it too slow it will get stuck on 1 or 12. Just hit cancel, click the search box + enter the rest of the value.
And that's it. Works perfect every time I used it
