Will there be a difference in R,G and B values before and after tone mapping?

An image is read and hdr is created using makehdr command. when displayed using imshow, RGB values are showing value 1.After tonemapping it gives RGB values for each pixels. I guess tonemapping is used to display the hdr image.But is it possible to get actual RGB values of the hdr image before tonemapping(display of hdr not required but can specify the x,y coordinate)?