Alpha channel is an additional image channel that specifies transparency (or opacity) of each pixel in the image. ImageGear provides alpha channel support for the following file format filters:

Format	Support
Adobe PSB	Supports single Alpha channel for Read only. Supports additional Alpha channels as ImageGear Extra channels for Read only.
Adobe PSD	Supports single Alpha channel for Read only. Supports additional Alpha channels as ImageGear Extra channels for Read only.
CUR	Supports single 8-bit alpha channel for read/write. Supports single 1-bit alpha channel for read only.
EXIF-JPEG	Supports single Alpha channel for Read/write.
EXIF-TIFF	Supports single Alpha channel for read only. Supports additional Alpha channels as ImageGear Extra channels for read only.The following compressions are supported with alpha channel: Uncompressed Packed Bits LZW Deflate
FlashPix	Supports single Alpha channel for read only. Converts RGB + Alpha to RGB during loading.
ICO	Supports single 8-bit alpha channel for read/write. Supports single 1-bit alpha channel for read only.
JPEG	Supports single Alpha channel for Read/write.
JPEG 2000	Supports single Alpha channel for read/write, for Grayscale and RGB images.
JPX	Supports single Alpha channel for read/write, for Grayscale and RGB images. Supports additional Alpha channels as ImageGear Extra channels for read/write.
MAC PICT	Supports single alpha channel for read only. Alpha channel have to be 8-bit image.
PNG	Supports single Alpha channel for read/write.
RAW	Supports single Alpha channel in uncompressed images for read only.
SGI	Supports single alpha channel for read and write.
TGA	Supports single alpha channel for read and write.
TIFF	Supports single Alpha channel for read and write. Supports additional Alpha channels as ImageGear Extra channels for read and write.The following compressions are supported with alpha channel: Uncompressed Packed Bits LZW Deflate