Chroma 1.0 events are less efficient and can affect editor performance once you have more than about 20 thousand events. Additionally, it is not recommended for use in modern maps as support may be dropped at any time.
Select a Chroma event by clicking on the color wheel or adjusting the sliders to get the color you want.
Save a Chroma color by right clicking on a square on the top of the RGB panel. Click on a square to select the saved color.
Pick a colour from an already placed Chroma event by pressing C while hovering over the event.
Select a vanilla lighting event by clicking on an event from the normal lighting menu.
It is HIGHLY recommended that you convert your map to the 2.0 format using the ChromaNoodleConverter before release. Be sure to make a backup before using this as the new format does not function in MMA2 and there is no "unconverting".
Chroma events don't do anything on its own. Chroma events function by acting as a light filter for future events essentially "dying" the normal lighting events to the specified color. In the following example, the orange and pink events don't do anything until the vanilla blue fade event happens. This functions as an orange fade and then a pink fade.
Do not place chroma events inside another event. It can cause issues when copy pasting and MMA2's shoddy rounding can even place the chroma after the actual event and it won't change colour. Completely avoid it. ~Halcyon12
Using darker shades of a color, allows you to emulate a custom fade in/out effect. Colors that have a that use a lower value will emanate less light (appearing darker). Using a gradient that starts or ends with a black color can give the feeling of a fade in / out event.
Chroma 2.0 is the latest version of Chroma providing even more options to spice up your lighting. This includes the ability to: create gradients without hundreds of events, individually light lasers, use precise laser events, and use precise rotation events.
All the available features are listed in the documentation: GitHub
Chroma 2.0 is currently only supported by ChroMapper. Opening a map in MMA2 will remove any Chroma 2.0 events from the difficulty.
In the new Chroma format, the colour data is built into the vanilla lighting event. There's no need to place a Chroma event before the actual lighting event. The color data format now has an optional forth value for alpha. These can be used for even more convincing fades or for more subtle lighting.