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MediaScript Objects and Methods 129 

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PreserveBackgroundCutoff

 - specifies the threshold for PreserveBackground. The 

default threshold percentage is 67%, which means that the background color will be 
preserved unless 67% or more of the pixels use the background color.

Padcolor

 or 

Padindex

 - specifies the color to be used where the new image dimensions 

extend beyond the current image. If a pad color is not specified, the image’s background 
color is used by default. For more information about setting an image’s background color, 
see 

.

Transparency

 

- specifies the transparency (255 is opaque and 0 is transparent) of the 

padded area’s alpha channel. This parameter is useful when the cropped image is used in 
a 

. 

TransparentCutoff

 - specifies a value that controls the selection of the transparent pixel 

when scaling images with color palette. If the scaled alpha channel value is less than or 
equal to the transparentCutoff value, the transparent pixel is selected. A value of -1 
(default) ignores the scaled alpha value and performs the normal reverse color lookup.

var image = new Media();

image.load(name @ "pasta.tga");

image.scale(xs @ "75%", constrain @ true);

image.save(type @ "jpeg");

Creates a selection from the specified Media object. 

The selected area can be thought of as a grayscale image or alpha channel that determines 
the way in which a given transform is applied to an image. Where the selection is 255, the 
transform or function is applied to the image pixel; where the selection is zero, the 
transform is not applied. In cases where the selection is between 1 and 254, the transform 
is applied to the source pixel, and the result is then blended with the original pixel based 
on the selection value. This function also fully supports the CMYK color-space.