I'm thinking of getting a white balance card. But is there really a need for that? I have taken photos with my camera and the outcome of the photo on the screen of the camera and on my computer monitor are completely different.
And what is the difference between these 3:
White balance card
Colour card (don't really know what is called, basically its just a card with all the colours)
But more importantly, where can I get them, assuming if I want to get?