Description This function will linearly stretch the histogram automatically to reach an optimum hystogram distribution. If a nonlinear correction is needed use gamma correction function. 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 auto contrasted image.
Syntax RetVal = [BiFilter.]FilterAutoContrast hDib 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.
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