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Function
This
is different to Shake's Blur as this preset blurs just the
alpha channel of the image. By default a gaussian blur is
used, but you can change the filter for both X and Y. It's
very important to keep an eye on the spread function. Because
the workspace is infinite, you can select which pixels will
be used for the blur calculation - only the pixels inside
the image, or outside as well. If you are getting clipping
or dark edges on your final image you should toggle Blur
Alphas's spread parameters.
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Parameters
|
Type
|
Defaults
|
Function
|
| xPixels |
float
|
0 |
The
amount of blur as described in Pixels in a horizontal
direction, for example the amount of 200 will blur 200
pixels to either side of the current pixel. |
| yPixels |
float
|
xPixels/Get
DefaultAspect() |
The
amount of blur as described in Pixels in a vertical
direction. By preset the BlurAlpha uses the same amount
as defined for the xPixels. |
| spread |
int
|
0 |
This
tells Shake whether to treat the area outside of the
frame or not.
0
= Compute within the frame (default)
1 = Compute outside of the frame
Because
of the infinite workspace, it is sometimes handy to
compute outside of the frame as well, for example
if the Blur Alpha is placed after a Scale command.
Note that if nothing is outside of the frame (ie,
black), you will see a black edge.
|
| xFilter |
string
|
"gauss" |
The
name of any available Filter Type for the horizontal
blur direction. |
| yFilter |
string
|
"gauss" |
The
name of any available Filter Type for the vertical blur
direction. |
| channels |
string
|
"nnna" |
Which
channels will be blurred. Any or all of rgba. |
Synopsis
image
BlurAlpha(
image In,
float xPixels,
float yPixels,
int spread,
const char * xFilter,
const char * yFilter,
const char * channels
);
Script
image = BlurAlpha( In, xPixels, yPixels, spread, "xFilter", "yFilter", "channels" );
Command
Line (Terminal)
shake
-bluralpha xPixels yPixels spread etc...
Examples
(Terminal)
shake
/www.CGM-online.com/doc/CGM_Logo.tif -bluralpha 100
- adds the BlurAlpha filter to the CGM logo. The blur
amount is set to 100 pixels horizontal.
The preset values are used for all other parameters.
shake /www.CGM-online.com/doc/CGM_Logo.tif -bluralpha
"Linear(0,0@1,400@20)"
- adds the BlurAlpha filter to the CGM logo and animates
the amout of blur from 0 to 400 during the frame
range of 1 to 20.
shake /www.CGM-online.com/doc/CGM_Logo.tif -bluralpha 0
100
- adds the BlurAlpha filter to the CGM logo and just
blurs vertically using the amount of 100 pixels.
shake /www.CGM-online.com/doc/CGM_Logo.tif -bluralpha 100
400 0 "gauss" "gauss" "rgbn"
- adds the BlurAlpha filter to the CGM logo and blurs all
channels instead of the alpha channel.
Example
(Shake's Command Line)
/www.CGM-online.com/doc/CGM_Logo.tif -bluralpha 100
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