For example, the expression frame/10 causes the noise to change completely over 10 frames. This control must be animated to produce noise changes over time. Offsets the noise to create new patterns. For example, low y values relative to x produces horizontal noise.
Sets the lowest possible noise frequency on the x and y axes. turbulence - similar to fBm except it uses the absolute value of the noise function so the values it sums up are all between 0 and 1.fBm (fractional Brownian motion) - runs noise() octave times at different scales to get random numbers between -1 and +1 and adds them up.Inverts the use of the mask channel so that the noise is limited to the non-white areas of the mask. Injecting the mask allows you to use the same mask further downstream. By default, the noise is limited to the non-black areas of this channel.Ĭopies the mask input to the predefined mask.a channel. Disabling this checkbox is the same as setting the channel to none. Sets the noise opacity where 0 is equal to transparent, and 1 is equal to opaque.Įnables the associated mask channel to the right. When enabled, inverts the new noise and non-noise areas. You might find replace useful, for instance, if you’re creating a mask in the alpha channel, but the incoming image already has an alpha channel which you want to throw away. When enabled, existing channels are cleared to black before drawing into them. intersect bbox and format - restrict the output image to an intersection of the bounding box and incoming format area.union bbox and format - restrict the output image to a combination of the incoming bounding box and format area.format - restrict the output image to the incoming format area.bbox - restrict the output image to the incoming bounding box.If you don’t want this to happen, set premult to rgb instead. Note:Selecting rgba premultiplies the alpha against itself (a*a). Where the noise is opaque (the matte is white or full), the input channels keep their full value. For example, where there is no noise (the matte is black or empty), the input channels are set to black. Premultiply multiplies the chosen input channels with a mask representing the noise. If you set this to something other than none, you can use the checkboxes on the right to select individual channels. The noise is rendered into these output channels. If you cannot see the mask input, ensure that the mask control is disabled or set to none. By default, the noise is limited to the non-black areas of the mask.Īt first, the mask input appears as triangle on the right side of the node, but when you drag it, it turns into an arrow labeled mask. The image sequence to which noise is added.Īn optional image to use as a mask. See also Grain, ScannedGrain, and F_ReGrain.
Adds various types of seemingly random noise to the input image, all based on the Perlin noise function.
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