#include "BIFILTER.H"
HANDLE CALLBACK FilterAutoLevels( HDIB hDIB,
int iPercent,
int iShowProgress,
HWND hParent)
Description
This function will adjust the input image’s levels automatically. AutoLevels filtering clips iPercent percent of colors (iPercent/2 from darkest colors and iPercent/2 from lightest colors) and then stretches the image’s histogram to the 0..255 range. AutoLevels filtering filters the color channels of the image separately. This function works for only 8 and 24 bit per pixel images.
Examples
The original 180 x 210 pixel image and the AutoLeveled image with iPercent = 10 parameter value.
Parameters
|
HDIB |
hDIB |
Handle of the DIB to filter. |
|
int |
iPercent |
Percent of colors to be clipped. |
|
int |
iShowProgress |
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 BiDlgs.dll installed. |
|
HWND |
hParent |
Handler of the parent window. |
Return values
The handle of the new filtered DIB or NULL if an error occurred.
Programming notes
The function will not free the input DIB.
Requirements
Header : Declared in BIFilter.h; include BIFilter.h.
Library : Use BIFilter.lib.
DLLs : BIFilter.dll , BIDlgs32.dl.