Description This function will posterize the input image to reduce the color levels of the image. Posterizing is a linear quantification of the color values to the specified number of levels. This function works for only 8 bit per pixel and 24 bit per pixel images.
Examples
The original 180 x 210 pixel image and the posterized image to 2 color levels.
Syntax RetVal = [BiFilter.]FilterPosterizing hDib iLevels iShowProgress hWnd
Returns RetVal Long The handle of new filtered DIB, 0 if an error occurred, or –1 if the BIFilter.dll does not installed.
Remarks hDIB Long Handle of the image to filter.
iLevels short The desired number of color levels of the output image.
iShowProgress short This parameter specifies the displaying of the progressbar and the preview dialog.
Available values:
DISPLAY_NONE (0) – The progressbar and the preview dialog will not display before filtering.
DISPLAY_PROGRESS (1) – The progressbar will display during filtering procedure.
DISPLAY_DIALOG (2) – The preview dialog will display before filtering. This dialog shows the part of the image before and after filtering.
DISPLAY_BOTH (3) – The progressbar and the preview dialog will display.
IMPORTANT: The preview dialog will only display, if there is BIDlgs32.dll installed.
hWnd Long Handler of the parent window.
See Also