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AnnotationAppearanceStream interface

Optional appearance data that controls how the annotation is rendered. Appearance streams enable the annotation to be presented visually in different ways to reflect its interactions with the user. Each appearance stream is a byte stream of a Document Filters supported image format. See Supported Formats, Raster image and Vector image for a list of supported formats. Please note only the SVG format is preserved as an SVG when creating appearance streams. All other formats will be rasterized.

Appearance streams are currently for writing only and are not read from PDFs.

AnnotationAppearanceStream::ContentType property

The content type of the Content stream.
AnnotationAppearanceStream::Encoding property

String describing the content encoding. This must be "Base64" unless the content of the stream is a SVG in which case this value may also be "none". For .NET this value is always "Base64".
AnnotationAppearanceStream::Content property

The content in a supported format, such as SVG.