WM_CAP_PAL_MANUALCREATE

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

WM_CAP_PAL_MANUALCREATE 
wParam = (WPARAM) (fGrab); 
lParam = (LPARAM) (DWORD) (iColors); 
 

Parameters

fGrab

Palette histogram flag. Set this parameter to TRUE for each frame included in creating the optimal palette. After the last frame has been collected, set this parameter to FALSE to calculate the optimal palette and send it to the capture driver.

iColors

Number of colors in the palette. The maximum value for this parameter is 256. This value is used only during collection of the first frame in a sequence.

Return Values

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.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in vfw.h.

See Also

Video Capture Overview, Video Capture Messages, capPaletteManual, WM_CAP_SET_CALLBACK_ERROR