The colour compensating filters (cyan, magenta and yellow) correct dominant monochromatic colours. Working on the principle of subtractive syntheses of colours, these filters – each available in 6 different intensities that can be combined as necessary – allow for correction of any chromatic discrepancy. Their uses are numerous and varied : balancing a mixture of light sources, compensating an aging flash tube, rectifying the occurrence of intrusive reflections/glare/an undesired ray, removing the chromatic variation of certain films, etc. Besides these purely technical uses, these filters can also play a very interesting creative role by introducing a dominant colour, subtle or pronounced, according to the type of filter used. With digital shooting, the use of these filters is still relevant, as much for the simplicity and time gain that they bring in practice, as for the sureness and predictability of their results