Blend modes
Sketch and Toon boasts a healthy selection of blend modes. There are various places where you can choose a blend mode, such as on the Sketch material’s Render tab where you can control how lines should be blended together.
Average
The result is the average of the background pixel and the blend pixel.
Normal
The background pixel is completely covered by the blend pixel if the strength of blending is 100%.
Multiply
This mode multiples the background pixel by the blend pixel. Unless the blend pixel is white, the result will be darker than the background pixel.
Screen
This is the opposite of the Multiply blend mode. The background pixel and blend pixel are both inverted, multiplied and then inverted again. This mode generally gives a result brighter than the background.
Darken
The background and blend pixel are compared and the result is whichever is darker.
Lighten
This is the same as darken except the result is whichever pixel is lighter.
Difference
The background and blend pixels are subtracted from each other.
Negative
The Negative mode is the same as Difference mode except colors between white and black become brighter instead of darker.
Exclusion
This mode is the same as Difference mode except that it creates a softer effect.
Overlay
A combination of Screen and Multiply mode, depending on the background color.
Hard Light
This mode works like Multiply mode and Screen mode at the same time. 50% brightness is neutral (nothing happens). Lighter values act like Screen, darker values act like Multiply.
Soft Light
This is a combination of the Burn and Dodge modes. The Dodge mode is used for blend pixels greater than 50% brightness, the Burn mode is used for values below 50%.
Dodge, Burn
The brightness value of the blend pixel is used to brighten (Dodge) or darken (Burn) the background pixel.
Reflect
Similar to Dodge mode but the result is not as bright in some cases.
Glow
The color of the background pixel and blend pixel are swapped. The result is similar to Hard Light mode.
Freeze
The background pixel and blend pixel are inverted and the result inverted again.
Heat
Like Freeze mode but the background pixel and blend pixel are swapped.
Add
One of the simplest blend modes: the background pixel and blend pixel are added together.
Subtract
The background pixel and blend pixel are added together then white is subtracted (result = background color + blend color - 256).
Stamp
A blend pixel that is 50% bright doesn’t change the background pixel; brighter or darker blend pixels produce a darker or brighter result respectively.
Xor
The background pixel and blend pixel are combined with a logical XOR.
Hue, Saturation, Luminance
In these modes, the result is the hue, saturation or luminosity of the blend pixel applied to the background pixel.
Red, Green, Blue
The result is the red, green or blue color channel from the blend pixel and the two other color channels from the background pixel. For example, Green mode gives you the green color channel from the blend pixel and the red and blue color channels from the background pixel.
Overwrite
This is mostly useful for technical illustrations using patterns. It ignores any opacity (which is used to do the pattern) from behind it and overwrites the opacity so that you can always see the pattern.
Levr
The value of the blend pixel is used to apply contrast to the background pixel.