ScannedGrain

The image sequence to receive the grain.

Sets the file path of your scanned grain images.

To create the film grain images:

Sets the first frame of the grain file to use.

Sets the last frame of the grain file to use. Approximately 50 frames are required to produce random grain.

Sets the minimum width (in pixels) that images must have in order for grain to be applied.

Set a minimum width to ensure that the grain resolution matches the image otherwise you may get unwanted results.

When enabled, resizes the grain plate to match your input.

When disabled, the grain plate is cropped to match.

Increases the number of grain images available by allowing random horizontal and vertical flipping of the grain plate. Flipping can produce a more random grain spread, but increases processing time.

Sets the value of neutral gray to subtract from images. The closer this value is to the input gray, the more grain is visible.

Amount of grain

Sets the multiplier for the red channel applied to the grain.

Sets the multiplier for the green channel applied to the grain.

Sets the multiplier for the blue channel applied to the grain.

Sets the intensity of grain hue across all channels.

When enabled, the output LUT is clamped between 0 and 1. This control is enabled by default for backward compatibility.

When disabled, Nuke does not clamp the LUT.

The grain sequence’s color curves. You can use these to edit the gain, gamma, contrast, and so on for individual channels. You can also look up color information for the current pixel in the Viewer.

Returns the selected curve(s) to the default values.

Sets the low threshold based on the input image.

In general, when grain is added to an image, some input pixel values become higher, while others become lower. This control allows you to stop pixel values from going below a certain value, such as the blackpoint in your image.

A different grain pattern is produced for each frame. Change this number to get a different initial pattern, for instance if you are using multiple ScannedGrain nodes.

If you require an identical grain plate for every frame, enter -frame in this field.

Enables the associated mask channel to the right. Disabling this checkbox is the same as setting the channel to none.

The channel to use as a mask. By default, the grain is limited to the non-black areas of this channel.

Copies the mask input to the predefined mask.a channel. Injecting the mask allows you to use the same mask further downstream.

Inverts the use of the mask channel, so that grain is limited to the non-white areas of the mask.

Blurs the edges of the mask.

Enables the associated channel to the right. Disabling this checkbox is the same as setting the channel to none.

The image is divided by this channel before being processed, and multiplied again afterwards.

If you are using premultiplied input images, you may want to check (un)premult by and select rgba.alpha here. This will simulate applying the grain before the premultiplication was done. It is the same as adding an Unpremult node before this node and a Premult node after, but allows you to work faster if you’re only using one ScannedGrain node.

If you are using unpremultiplied input images, you should leave this set to none.

Inverts the use of the (un)premultiply channel.