Settings and Macros/Ramp Description
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Draws a simple gradient directly on top of an image without the need to create a BG tool and merge it. The macro also allows you to smooth the ramp as well as draw a "perceptively linear" gradient that only looks linear under an sRGB viewer LUT.
Main Inputs
The following inputs appear on the tool's tile in the Flow Editor:
- Input
- Source image. Required.
- Effect Mask
- Defines where the ramp is drawn. Optional.
Controls Tab
Point control. Defines the starting point of the ramp. The color at this point will always be full transparency.
Point control. Defines the end point of the ramp. The color at this point can be adjusted by the color sliders below.
Color control. Adjust the gradient's end color values. Red, green, blue and alpha can be adjusted independently. The macro works in 32bit float, so it's also possible to define values larger than 1. However, if your input image is int8 or int16, these values will get clamped.
Combo control. By default, the gradient uses linear interpolation. You can smooth the ramp's start and end points by selecting a different option in this dropdown. See the graphs above for a demonstration of how the gradient will be drawn. The "perceptually linear" ramp is useful if you're working in linear color space but want to draw a ramp that looks linear under an sRGB or HD 709 viewer LUT.
By default, the ramp is simply drawn on top of the input image that is provided. If this option is checked, however, the alpha channel of the input image is preserved (using the "Atop" merge mode instead of "Over").
