The Grain adjustment emulates the look of analog film. You can use it to add some film grain to digital images.
You can add film grain to a single layer or, using a color adjustments layer, to multiple layers in a composition.
To apply a film grain to the currently selected layer, do one of the following:
To apply a film grain multiple layers in a composition using a color adjustments layer (all layers below this layer will be affected):
Note: If the adjustment isn't visible, you can turn it on from the Customize menu at the bottom of the Color Adjustments pane.
2. Drag the Size slider to control the size of the grain particles. Hold down thekey before dragging if you’d like to extend the range of the slider beyond 100%. You can also manually enter a percentage value from 0% to 400%.
3. Drag the Intensity slider to adjust the visibility of the grain particles. You can also manually enter a value from 0% to 100%.
Show Original: Click the Show Original button or press+ on your keyboard to see what the image looks like without any color adjustments.
Show Split Comparison:-click the Show Original button, press + on your keyboard, or force click the canvas.
To reset all Color Adjustments, click Reset at the bottom of the Color Adjustments pane.