Histogram Threshold
Updated: 1 Oct 2025
A thresholding process based on the percentage of pixels rather than their intensity.
Histogram Threshold
Method #
A thresholding process based on the percentage (brightness) of pixels rather than their intensity.
Can be used to generate a mask based on the ‘Luminance’ of the input.
Parameters
These properties control the core behaviours of the node.
Parameter Details Active
Enables or disables the effect. Disabling the effect means it will no longer compute, so disabling a node when not in use can improve performance.
Blend Amount
Changes the opacity of the new effect over the original image.
Blend Mode (RGB)
Change how the generated effect blends with the parent image RGB.
- Solid : The effect is not blended with the scene.
- Blend : The effect is blended with the scene using the Alpha Channel.
- Additive : The effect is ‘Added’, brightening the scene where the effect is applied.
- Subtractive : The effect is ‘Subtracted’, darkening the scene where the effect is applied.
- Multiply : The effect is ‘Multiplied’, darkening the scene based on the effect’s colour.
- Max : The effect is ‘Maxed’, taking the maximum value between the effect and the scene.
- Min : The effect is ‘Min’d’, taking the minimum value between the effect and the scene.
- Screen : The effect is ‘Screened’, brightening the scene based on the effect’s colour.
- Light : The effect is ‘Light’, brightening the scene based on the effect’s colour.
- Pre-Mul Blend : The effect is blended with the scene before the Alpha Channel is applied.
- Difference : The effect is ‘Differenced’, creating a high-contrast effect based on the difference between the effect and the scene.
- Exclusion : The effect is ‘Excluded’, creating a low-contrast effect based on the exclusion of the effect from the scene.
- Dodge : The effect is ‘Dodged’, brightening the scene based on the effect’s colour.
- Burn : The effect is ‘Burned’, darkening the scene based on the effect’s colour.
- Negate : The effect is ‘Negated’, brightening the scene based on the inverse of the effect’s colour.
- Overlay : The effect is ‘Overlaid’, combining the effect and the scene based on the effect’s colour.
Threshold
Controls the threshold value used to determine which pixels are affected.
Mode
The mode determines how the effect is applied based on the threshold.
- Below : The effect is applied to pixels below the threshold.
- Above : The effect is applied to pixels above the threshold.
Output Mode
The output mode determines the format of the output image.
- Colour : The output contains the original colours of the image.
- Mask : The output is a mask image.
Inputs
These properties control the core behaviours of the node.
| Parameter | Details |
|---|---|
| Active | Enables or disables the effect. Disabling the effect means it will no longer compute, so disabling a node when not in use can improve performance. |
| Blend Amount | Changes the opacity of the new effect over the original image. |
| Blend Mode (RGB) |
Change how the generated effect blends with the parent image RGB.
|
| Threshold | Controls the threshold value used to determine which pixels are affected. |
| Mode |
The mode determines how the effect is applied based on the threshold.
|
| Output Mode |
The output mode determines the format of the output image.
|
There are no inputs for this node.