2.6.1.3 imgBrightness

Contents

Menu Information

Image: Adjustments: Brightness

Brief Information

Adjust image brightness

Command Line Usage

1. imgBrightness a:=2; 
2. imgBrightness a:=2 img:=mat(1) oimg:=mat(2);
3. imgBrightness a:=2 img:=[Mbook1]Msheet1!Mat(1) oimg:=<new>;

X-Function Execution Options

Please refer to the page for additional option switches when accessing the x-function from script

Variables

Display
Name 		Variable
Name 		I/O
and
Type 		Default
Value 		Description
Adjust Intensity a

Input

double

0

Use this variable to specify how to change the brightness. This value should be within [-100, 100]. Specifying a negative value will cause the brightness to be reduced, while a positive value will increases the brightness.

Input Matrix img

Input

Image

<active>

Specifies the image to be manipulated. The default input is the active image.

Output Image oimg

Output

Image

<input>

Specifies the output image. By default, the output image is the same as the input image.

See the syntax here.

Description

This function adjusts the brightness of an image. The brightness adjustment can be either positive or negative, which means that you can either increase or decrease the brightness of the input image.

Examples

//Create a new folder in the Project Explorer
pe_mkdir Adjustments path:=aa$;
pe_cd aa$;
//Create a matrix and import the sample image into it
window -t m;
fname$ = System.path.program$ +"samples\Image Processing and Analysis\white camellia.jpg";
impimage;
window -r %h Original;
window -d;	//Duplicate the image
window -r %h Modified;

//Adjustments
imgBalance c2r:=-7 m2g:=5;	//White balance
imgContrast a:=-22;	 //Decrease contrast
imgBrightness a:=10;	//Increase brightness

window -s T;	//Tile the windows horizontally

Algorithm

The computation uses L_ChangeBitmapIntensity() function from LEADTOOLS Main API. For this information, please refer to the LEADTOOLS Main API Help file, Version 14 and read the L_ChangeBitmapIntensity topic.

References

LEADTOOLS Main API Help file, Version 14

Related X-Functions

imgContrast, imgHue, imgSaturation, imgGamma, imgHistcontrast