Before you get into color correction please note that there are 2 ways of color grading, it could be visual or numeric. And be familiar with the tools available for evaluating image information namely: vectorscope, histogram, waveform monitor and RGB parade scope. These tools are very useful as your eyes gets subjected to color adaptation and brightness adaptation - when this happens you will have the tendency to push chroma and luma values higher than necessary so always refer to these tools for guidance.