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WM_CAP_PAL_AUTOCREATE message

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The WM_CAP_PAL_AUTOCREATE message requests that the capture driver sample video frames and automatically create a new palette. You can send this message explicitly or by using the capPaletteAuto macro.

WM_CAP_PAL_AUTOCREATE 
wParam = (WPARAM) (iFrames); 
lParam = (LPARAM) (DWORD) (iColors);

Parameters

iFrames

Number of frames to sample.

iColors

Number of colors in the palette. The maximum value for this parameter is 256.

Return Value

Returns TRUE if successful or FALSE otherwise.

If an error occurs and an error callback function is set using the WM_CAP_SET_CALLBACK_ERROR message, the error callback function is called.

Remarks

The sampled video sequence should include all the colors you want in the palette. To obtain the best palette, you might have to sample the whole sequence rather than a portion of it.

Requirements

Requirement Value
Minimum supported client
 Windows 2000 Professional [desktop apps only]
Minimum supported server
 Windows 2000 Server [desktop apps only]
Header
Vfw.h

See also

Video Capture

Video Capture Messages