man pages section 3: Multimedia Library Functions

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Updated: July 2014
 
 

mlib_ImageInvert (3MLIB)

Name

mlib_ImageInvert - invert

Synopsis

cc [ flag... ] file... –lmlib [ library... ]
#include <mlib.h>

mlib_status mlib_ImageInvert(mlib_image *dst, const mlib_image *src);

Description

The mlib_ImageInvert() function performs the inversion of an image such that white becomes black, light gray becomes dark gray, and so on.

It uses the following equation:

dst[x][y][i] = (Gwhite + Gblack) - src[x][y][i]

The values of Gwhite and Gblack for different types of images are:

Image Type
Gwhite
Gblack
Gwhite + Gblack
MLIB_BYTE
255
0
255 (0xFF)
MLIB_SHORT
32767
-32768
-1 (0xFFFF)
MLIB_USHORT
65535
0
65535 (0xFFFF)
MLIB_INT
2147483647
-2147483648
-1 (0xFFFFFFFF)

Given that integer data are in the two's complement representation, mlib_ImageInvert() is the same as mlib_ImageNot(), while mlib_ImageInvert_Inp() is the same as mlib_ImageNot_Inp().

Parameters

The function takes the following arguments:

dst

Pointer to destination image.

src

Pointer to source image.

Return Values

The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

Attributes

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Interface Stability
Committed
MT-Level
MT-Safe

See also

mlib_ImageInvert_Inp(3MLIB), mlib_ImageInvert_Fp(3MLIB), mlib_ImageInvert_Fp_Inp(3MLIB), attributes(5)