TIFF Format Overview
This topic provides information about the native TIFF codec available through Windows Imaging Component (WIC).
Codec Identity
The following table provides codec identification information.
| Component | Description |
|---|---|
| Formal Name(s) | Tagged Image File Format (TIFF) |
| File Name Extension(s) | tiff, tif |
| MIME type(s) | image/tiff, image/tif |
| Specification Support | TIFF Specification 6.0 |
The following table lists the GUIDs used to identify the native TIFF codec components.
| Component | Friendly Name | GUID |
|---|---|---|
| Container Format | GUID_ContainerFormatTiff | 163bcc30-e2e9-4f0b-961da3e9fdb788a3 |
| Decoder | CLSID_WICTiffDecoder | b54e85d9-fe23-499f-8b886acea7137502b |
| Encoder | CLSID_WICTiffEncoder | 0131be10-2001-4c5f-a9b0cc88fab64ce8 |
Encoding
The WIC encoding API are designed to be codec-independent and image encoding for WIC-enabled codecs is essentially the same. For more information about image encoding using the WIC API, see the Encoding Overview.
Encoder Options
WIC-enabled codecs differ at the encoding option level. Encoder options reflect the capabilities of an image encoder and each native codec supports a set of these encoder options. Encoder options can be basic WIC supported options available to all WIC enabled codes (though not necessarily supported) or codec-specific options designed by the image format codec. To manage these encoding options during the encoding process, WIC uses the IPropertyBag2 interface . For more information about using the IPropertyBag2 interface for WIC encoding , see the Encoding Overview.
The TIFF codec uses basic WIC options. The following table lists the WIC encoder options supported by the native TIFF codec.
| Property Name | VARTYPE | Value Range | Default Value |
|---|---|---|---|
| CompressionQuality | VT_R4 | 0 - 1.0 | 0 |
| TiffCompressionMethod | VT_UI1 | WICTiffCompressionOption | WICTiffCompressionDontCare |
If an encoder option is present in the IPropertyBag2 option list that the codec does not support, it is ignored.
CompressionQuality Option
Specifies the desired compression quality. 0.0 indicates the least efficient compression scheme available. Typically, this scheme results in a faster encode but larger output. A value of 1.0 specifies the most efficient compression scheme available. Typically, this scheme results in a longer encode but produces smaller output.
The default value is 0.
TiffCompressionMethod Option
Specifies the TIFF compression method.
The default value is WICTiffCompressionDontCare.
Decoding
The WIC decoding APIs are designed to be codec-independent and image decoding for WIC-enabled codecs is essentially the same. For more information about image decoding, see the Decoding Overview. For more information about using decoded image data, see the Bitmap Sources Overview.