You can set the following options for all raster effects in a document or when you rasterize a vector object.

Color Model

Determines the color model that is used during rasterization. You can generate an RGB or CMYK color image (depending on the color mode of your document), a grayscale image, or a 1‑bit image (which may be black and white or black and transparent, depending on the background option selected).

Resolution

Determines the number of pixels per inch (ppi) in the rasterized image. When rasterizing a vector object, select Use Document Raster Effects Resolution to use global resolution settings.

Background

Determines how transparent areas of the vector graphic are converted to pixels. Select White to fill transparent areas with white pixels, or select Transparent to make the background transparent. If you select Transparent, you create an alpha channel (for all images except 1‑bit images). The alpha channel is retained if the artwork is exported into Photoshop. (This option anti-aliases better than the Create Clipping Mask option.)

Anti-alias

Applies anti-aliasing to reduce the appearance of jagged edges in the rasterized image. When setting rasterization options for a document, deselect this option to maintain the crispness of fine lines and small text.

When rasterizing a vector object, select None to apply no anti-aliasing and maintain the hard edges of line art when it is rasterized. Select Art Optimized to apply anti-aliasing that is best suited to artwork without type. Select Type Optimized to apply anti-aliasing that is best suited to type.

Create Clipping Mask

Creates a mask that makes the background of the rasterized image appear transparent. You do not need to create a clipping mask if you selected Transparent for Background.

Add Around Object

Adds the specified number of pixels around the rasterized image.