DTWAIN_SetJpegXRValues
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The DTWAIN_SetJpegXRValues function sets the quality of an acquired JPEG-XR file as well as whether it is a progressive JPEG-XR.
DTWAIN_BOOL DTWAIN_SetJpegXRValues (
Parameters Source An open TWAIN Source.
Quality The JPEG-XR quality factor
bProgressive Determines whether the JPEG-XR file will be a progressive JPEG-XR file.
Return Values The return value is TRUE if successful. Otherwise FALSE is returned.
Comments The DTWAIN_SetJpegXRValues function sets the current quality and progressive nature of an acquired JPEG-XR file. The Quality parameter determines the quality of the JPEG-XR image. The quality determines the amount of detail the image will contain with respect to the original image acquired. The quality factor is numbered from 1 (low quality) to 100 (no loss, or lossless). The higher the quality factor, the larger in size the acquired JPEG-XR file will be. By default, the quality setting is 80, which is adequate for most JPEG-XR files.
The bProgressive argument determines whether the JPEG-XR file will be a progressive JPEG-XR file. In simple terms, a progressive JPEG-XR file is one where the display of such files in a web browser causes it to "progressively" display. This allows larger JPEG-XR files to partially show themselves when rendered in a browser, improving as more data is recieved by the browser. By default, the progressive setting is FALSE (no progressive file). With a non-progressive JPEG-XR file, a browser would have to wait until the entire file is recieved before displaying in a browser.
TWAIN State Transitions The Source must be in State 4. or higher
Prerequisite Function Call(s)
DTWAIN Source Selection Function
See Also
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