Apple Shake 4 - Manual (Page 872)

872 Chapter 28 Filters
Emboss
With the Emboss node, you control the gain and light direction to simulate a raised
texture over an image.
Note: The Emboss node converts your image to a BWA image (since there is no color
information).
If you use extreme gain, you may start to see terracing on your image. To correct this,
insert a Bytes node before the Emboss node, and boost your image to 2 bytes per
channel. You can get interesting patterns with a Bytes node set to 2 bytes, followed by a
Blur node, and then the Emboss node.
The elevation is set to 30 because it makes the median gray value 0.5.
Parameters
This node displays the following controls in the Parameters tab:
gain
The amount of emboss. Higher values result in a more pronounced effect.
azimuth
The apparent direction from which light is shining. 0 and 360 simulate light shining
from the right side of the image, 90 is from the top, and so on.
elevation
This is the “height” of the embossed image. 0 is parallel to the image; 90 is the same
axis as a line from your nose to the image.
FilmGrain
Use the FilmGrain node to apply grain that corresponds to real film grain to an element.
Grain is typically added to still or CG images so the images more closely match the
inherent noisiness of film plates.
You can choose to apply a preset film stock, sample grain from an existing image, or
create your own grain by adjusting the sliders.
To sample grain from an image:
1 Attach a Filter–FilmGrain node to the element to which you want to add grain.
2 Ensure that you are not in Proxy mode.
3 Load the image to be sampled into the Viewer.
Note: This should not be the image created by the FilmGrain node itself but, rather, one
generated prior to it in the node tree.
Warning: You cannot clone a FilmGrain node in the Node View using the Paste Linked
command.