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CGM Plug-in for Apple Shake: Percent Blur Alpha

Function

The Percent Blur Alpha function blurs the image according to a percentage factor, rather than a pixel size which is done in the Blur Alpha. Setting 100 percent therefore blurs the entire image in the blur calculation. The Percent Blur Alpha preset is set to blur just the alpha channel of the image, which is the only difference to Shake's Percent Blur.

Parameters
Type
Defaults
Function
xPercent
float
0 Percent of the image taken into consideration for the horizontal blur. 100 = the entire image, or a flat color. Default is 0.
yPercent
float
xPercent/Get
DefaultAspect()
/height*width
Percent of the image taken into consideration for the vertical blur. 100 = the entire image, or a flat color. Default is 0.
spread
int
0

This tells Shake whether it needs to treat the area outside of the frame.

0 = Compute within the frame (default)
1 = Compute outside of the frame

Because the workspace is infinite, it's sometimes handy to compute outside of the frame as well, for example if the Blur is placed after a Scale command. Note that if there is nothing outside of the frame (ie, black), you will see a black edge.

channels
string
"nnna" Which channels Shake should blur. Any or all of rgba.

Synopsis

image PercentBlurAlpha(
 image In,
 float xPercent,
 float yPercent,
 int spread,
 const char * channels
);

Script

image = PercentBlurAlpha( In, xPercent, yPercent, spread, "channels" );

Command Line (Terminal)

shake -percentbluralpha xPercent yPercent spread etc...

Examples (Terminal)

shake /www.CGM-online.com/doc/CGM_Logo.tif -percentbluralpha 10
- adds the PercentBlurAlpha filter to the CGM logo. The blur amount is set to 10 percent.
  The preset values are used for all other parameters.

shake /www.CGM-online.com/doc/CGM_Logo.tif -percentbluralpha"Linear(0,0@1,10@20)"
- adds the PercentBlurAlpha filter to the CGM logo and animates the amout of blur from 0 to 10 percent
  during the frame range of 1 to 20.

shake /www.CGM-online.com/doc/CGM_Logo.tif -percentbluralpha 10 0 0 "rgbn"
- adds the PercentBlurAlpha filter to the CGM logo and blurs only horizontally all channels instead of the
  alpha channel.

Example (Shake's Command Line)

/www.CGM-online.com/doc/CGM_Logo.tif -percentbluralpha 10

 

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