Each decoding pass reveals more of the image until the image is fully downloaded and decoded. It then performs multiple decoding passes on the image as each progressive level is downloaded. The decoder performs a decoding pass on the image's current progressive level. Progressive decoding starts after a progressive level of an image has finished downloading. Traditional decoding requires a complete image file before decoding can begin. Progressive decoding is the ability to incrementally decode portions of an image from an incomplete image file. This topic outlines progressive decoding in Windows 7 and the procedure for enabling progressive decoding in your applications. Progressive encoding is not supported in the current release of WIC. WIC also supports any WIC-enabled non-Microsoft codecs that implement progressive decoding. The Windows Imaging Component (WIC) in Windows 7 supports progressive decoding of popular image formats such as JPEG, PNG, and GIF. This feature is essential for any application used to view images from the Internet or from data sources with limited bandwidth. Users are able to see an image preview with available data long before the entire image is downloaded. This feature greatly improves the user's experience when viewing images from the Internet, because the user does not have to wait for the entire image to download before decoding can begin. Progressive decoding provides the ability to incrementally decode and render portions of an image before the entire image has finished downloading.
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