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GFL Colors

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gflBrigthness

The gflBrigthness function increases or decreases the brightness of a picture. 

GFL_ERROR gflBrigthness(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst,  
  GFL_INT32 brightness
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.
brightness
An integer between -255 and 255.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.

gflContrast

The gflContrast function increases or decreases the contrast of a picture. 

GFL_ERROR gflContrast(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst,  
  GFL_INT32 contrast
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.
contrast
An integer between -127 and 127.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.

gflGamma

The gflGamma function increases or decreases the gamma of a picture. 

GFL_ERROR gflGamma(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst,  
  double gamma
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.
gamma
A number between 0.01 and 5.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.

gflAdjust

The gflAdjust function allows to adjust brightness, contrast & gamma of a picture. 

GFL_ERROR gflAdjust(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst,  
  GFL_INT32 brightness,  
  GFL_INT32 contrast,  
  double gamma
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.
brightness
An integer between -255 and 255.
contrast
An integer between -127 and 127.
gamma
A number between 0.01 and 5.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.


gflAdjustHLS

The gflAdjustHLS function allows to adjust the hue, lightness & saturation of a picture. 

GFL_ERROR gflAdjustHLS(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst,  
  GFL_INT32 h_increment,  
  GFL_INT32 l_increment,  
  GFL_INT32 s_increment
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.
h_increment
An interger between -100 and 100 to add to the hue value.
l_increment
An interger between -100 and 100 to add to the lightness value.
s_increment
An interger between -100 and 100 to add to the saturation value.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.


gflNegative

The gflNegative function applies the negative of a picture. 

GFL_ERROR gflNegative(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.

gflLogCorrection

The gflLogCorrection function applies a logarithmic correction on a picture. 

GFL_ERROR gflLogCorrection(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.


gflNormalize

The gflNormalize function applies a normalisation of the pixels values. 

GFL_ERROR gflNormalize(
 GFL_BITMAP* src,  
 GFL_BITMAP** dst
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.

gflEqualize

The gflEqualize function applies an equalization of the pixels. 

GFL_ERROR gflEqualize(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.


gflEqualizeOnLuminance

The gflEqualizeOnLuminance function applies an equalization of the pixels (based on the luminance). 

GFL_ERROR gflEqualizeOnLuminance(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.

gflBalance

The gflBalance function applies a color balance of a picture. 

GFL_ERROR gflBalance(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst,  
  const GFL_COLOR* color
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.
color
Pointer to a GFL_COLOR structure.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.


gflSwapColors

The gflSwapColors function allows to swap component. 

GFL_ERROR gflSwapColors(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst,  
  GFL_SWAPCOLORS_MODE mode
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.
mode
GFL_SWAPCOLORS_RBG 0
GFL_SWAPCOLORS_BGR 1
GFL_SWAPCOLORS_BRG 2
GFL_SWAPCOLORS_GRB 3
GFL_SWAPCOLORS_GBR 4

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.


gflSepia

The gflSepia function converts a picture in sepia. 

GFL_ERROR gflSepia(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst,  
  GFL_INT32 percent
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.
percent
An integer between 0 and 100.
0 => greyscale, 100 => maximum sepia

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.

gflSepiaEx

The gflSepiaEx function converts a picture in sepia. 

GFL_ERROR gflSepiaEx(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst,  
  GFL_INT32 percent,  
  const GFL_COLOR* color
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.
percent
An integer between 0 and 100.
0 => greyscale, 100 => maximum sepia
color
Pointer to a GFL_COLOR structure.
This color is used as a reference.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.


gflAutomaticLevels

The gflAutomaticLevels function applies an automatic equalisation of levels. 

GFL_ERROR gflAutomaticLevels(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.


gflAutomaticContrast

The gflAutomaticContrast function adjusts the contrast of picture. 

GFL_ERROR gflAutomaticContrast(
  GFL_BITMAP* src,  
  GFL_BITMAP** dst
);

Parameters

src
Pointer to a GFL_BITMAP structure.
dst
Address of a pointer to a GFL_BITMAP structure. NULL if on the same instance.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.
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