The Assemble HLS component assembles an image from the supplied H, L and S channels according to the HLS color model. H, L and S stand for hue, lightness and saturation respectively. For more information on the HLS color model, see this Wikipedia article on the HLS color model. Assemble HLS is a map component, it can be located in the Channels category on the Components Bar.
Since all the channels are supplied by map inputs, their values can be controlled separately for different image areas by connecting a map component to the corresponding input. In this case the output brightness of the map component defines the channel value: black areas correspond to the value of 0, white areas to the maximum channel value (360 for the H channel and 100 for L and S), and the values in-between are represented by intermediate brightness levels.
The alpha channel of the image produced by this component is always set to 100%; to set a different alpha channel, use the Set Alpha component.
H: Map Input
Defines the value of the Hue channel in the range between 0 and 360. Value of 0 yields red hue, 120 yields green, 240 — blue, and 360 yields red again; intermediate values yield hues such as cyan, magenta and yellow. Since H is a map input, its value can be controlled separately for different image areas by connecting a map component to this input.
L: Map Input
Defines the value of the Lightness channel in the range between 0 and 100. Value of 0 yields black, value of 100 yields white, and intermediate values produce colors ranging from black through the specified hue to white. Since L is a map input, its value can be controlled separately for different image areas by connecting a map component to this input.
S: Map Input
Defines the value of the Saturation channel in the range between 0 and 100. With the value of 0, the color is completely desaturated; with the value of 100, the color is most saturated. Since S is a map input, its value can be controlled separately for different image areas by connecting a map component to this input.
