Dynamically Determine Hex Background and Text Color

remnant

I've got a script where I dynamically generate background colors for form items, the problem I'm running into is determining whether to use white or black text.

I need a way to look at the hex value, say FFFFFF, and know that I want black text. I'm also dealing with far too many colors to input the text color in the database so I need do this on the fly.

I know I've seen this done, but it was in C++. Anyone have an idea of how to do it in PHP or JS?

Any advice is greatly appreciated.

Thanks in advance.

Weedpacket

How was it done in C++? Should be straightforward to translate that. It's basically just a matter of knowing whether to use black or white, yes? Do you have any rule in mind which you'd prefer to have implemented - like "if the background is darker than such-and-such, then use white text, otherwise use black"?

remnant

Yes, a rule is probably the easiest way to go since I'm only looking to change between two text colors though I don't have a specific value in mind as to where it should change.

The following link is what I found in C++, it will explain the process a lot better than I would. The program is much more savvy than what I'll need, but it's a good starting point.
Link