var instance = new Vintasoft.Twain.WebAcquiredImageJS(twainDeviceManager, imageId, imageInfo);

var value; // Type: any

// Parameters
var contrastValue; // Type: number
var successFunc; // Type: function
var errorFunc; // Type: function

value = instance.changeContrastAsync(contrastValue, successFunc, errorFunc);

function changeContrastAsync(
   contrastValue
The contrast value in percents. Valid values are from -100 to 100. Default value is 0. Contrast is not changed if value of this property is set to 0.
 : number, 
   successFunc
A function that will be executed if request is executed successfully. Function prototype: "successFunc(image)", where 'image' parameter is an instance of WebAcquiredImageJS class.
 : Function, 
   errorFunc
A function that will be executed if request is failed. Function prototype: "errorFunc(image, errorMessage)", where 'image' parameter is an instance of WebAcquiredImageJS class, 'errorMessage' parameter is string that describes error.
 : Function
) : any;

Parameters

contrastValue

The contrast value in percents. Valid values are from -100 to 100. Default value is 0. Contrast is not changed if value of this property is set to 0.

successFunc

A function that will be executed if request is executed successfully. Function prototype: "successFunc(image)", where 'image' parameter is an instance of WebAcquiredImageJS class.

errorFunc

A function that will be executed if request is failed. Function prototype: "errorFunc(image, errorMessage)", where 'image' parameter is an instance of WebAcquiredImageJS class, 'errorMessage' parameter is string that describes error.

This function sends an asynchronous request to change contrast of image. If you want to use synchronous request instead of asynchronous request, please use WebAcquiredImageJS.changeContrast function.

Reference

WebAcquiredImageJS Class
WebAcquiredImageJS Members