c++ rgb2rgba

RGB stands for Red, Green, Blue and is a color model used in digital imaging. It is an additive color model in which colors are created by adding different amounts of red, green, and blue light.

RGBA stands for Red, Green, Blue, Alpha. The alpha channel represents the transparency of the color. RGBA is a color model similar to RGB, but with an additional alpha channel, which allows for the creation of transparent colors.

The conversion from RGB to RGBA involves adding an additional alpha channel to the RGB color model. This can be done by assigning a value to the alpha channel, which represents the transparency of the color. The alpha channel value ranges from 0 to 1, where 0 represents complete transparency and 1 represents complete opacity.

In programming languages, the conversion is usually done using a function called rgb2rgba, which takes an RGB color as input and outputs an RGBA color.