SMIL 2.0 and the RealNetworks extensions to SMIL 2.0 provide many ways to paint colored areas and manipulate clip transparency levels. See also Color Animations for samples of how to change background and clip colors through SMIL animations.

BRUSH OBJECTS
The <brush/> tag lets you paint areas with a color block. It functions like a clip source tag. For more information, see "Creating a Brush Object".

Sample File	Description	Featured Illustrated	Reference
brushobject.smil	Various colored blocks, each created by a <brush/> tag, which functions like a clip source tag.	<brush/> tags	click here
brushbackground.smil	A SMIL file uses brush objects and transition effects to create a dynamic background for the wipeslideshow.rp RealPix slideshow.	<brush/> tags and transition effects combined with other clips	click here
brushvideo.smil	Various colored brush objects overlay, then uncover a video.	<brush/> tags with begin and end times	click here
brushtransition.smil	Transition effects using brush objects simulate dynamically changing region background colors after two video clips play.	<brush/> tags and transition effects in a sequence of videos	click here

TRANSPARENCY
RealNetworks' extensions to SMIL let you manipulate transparency in clips. These extensions are described in "Modifying Clip Colors".

Sample File	Description	Featured Illustrated	Reference
frameoverlay.smil	A frame created from a PNG image that has a transparent background overlays a video.	support for native clip transparency	click here
backgroundopacity.smil	An image that includes transparency displays against a colored background. The image's transparency is decreased, then increased.	static and animated rn:backgroundOpacity attribute in a clip tag	click here
mediaopacity.smil	An opaque JPEG image is rendered more and more transparent.	static and animated rn:mediaOpacity attribute in a clip tag	click here
logo.smil	A GIF logo rendered semi-transparent appears in the corner of a video clip. An animation makes the logo opaque on a mouseover.	rn:mediaOpacity attribute and subregions	click here click here
chromakeys.smil	In a static JPEG image, a wider and wider range of colors around a selected color becomes transparent. The sample repeats with the colors becoming semi-transparent.	rn:chromaKey, rn:chromaKeyTolerance, and rn:chromaKeyOpacity attributes in a clip source tag	click here
textcolors.smil	A demonstration of SMIL advanced timing and the RealNetworks transparency extensions used along with static RealText clips.	RealText clips, transparency attributes, and advanced timing commands	click here