A system where the red, green, and blue components of a colour are stored in display memory, as opposed to storing logical colours and using a colour palette to convert them to red, green, blue components.
The advantage of true colour over a palette is that it does not restrict the range of colours which can be displayed on screen simultaneously. For example, if eight bits are used to store each component of each pixel then a total of 2^24 (about 17 million) different colours can be displayed at once which would require a (very expensive) palette with 3 * 2^24 bytes (about 50 megabytes) of memory.
The disadvantage of true colour is that image transformations which would normally be done by changing the palette must be done to every pixel of the image which can be much slower.
Compare high colour.
We get the true colour of contemporary opinion out of communications of this intimate and easy class.
The true colour of the sub-chloride is that which is exposed beneath an oxygen absorbent such as the nitrite.
The first storm of persecution brings him out again in his true colour.
Under certain circumstances, it may be quenched by a Nicol's prism, and we then obtain the true colour of the grass and foliage.
The flush vanished and left her cheeks to their true colour, that of a faded rose.
He does away with all appearances, and shows me things in their true colour and form.
The young ones do not acquire their true colour, neither can they fly till ten or eleven months old, but run very fast.
And you have to enclose it with a true outline, and to paint it with its true colour.
But in the day, after that discord, I always had the harmonious compensations of true colour.
It was a link between the black and white of the admirable wood-cut and the true colour picture.