AutoLevels

#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

Description: macskaauto                                                  Description: dwfasdf

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.