Color following on white line

Can i use QTR8 or QTR8A sensor array to detect R,G,B lines in a white background? i need to identify separately the lines
will i be able to do it?


It sounds like you are asking if the line sensor arrays can discriminate between different colored lines. The line sensors only sense IR reflectivity; they cannot directly sense color. It might be possible to use the QTR sensors in a system that recognizes the contrast in IR reflectivity between different colored surfaces if the IR reflectivity is unique and reproducible enough between your background and each of your colors, but it is something you would have to try yourself.

We do carry the following color sensor from Parallax:

Depending on your application, you could augment the line sensor with a single ColorPAL sensor, or construct a line sensing array entirely out of ColorPAL sensors.