Contrast Property

Summary

Gets or sets the contrast value to used when transferring images from the current TWAIN source.

Syntax

C++/CLI

Python

public float Contrast { get; set; }

public: 
property float Contrast { 
   float get(); 
   void set (    float ); 
}

Contrast # get and set (TwainImageEffects)

Property Value

The contrast value to use when transferring images from the current TWAIN source. The contrast values range from -1000 to 1000.

Remarks

This property internally gets or sets the contrast capability ICAP_CONTRAST. For more information on this capability, refer to the TWAIN specification. To get or set the contrast value call the ImageEffects property.

Example

using Leadtools; 
using Leadtools.Twain; 
 
 
public void ImageEffectsPropertyExample(IntPtr parent) 
{ 
   TwainSession session = new TwainSession(); 
   session.Startup(parent, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None); 
 
   TwainImageEffects imgEffects = session.ImageEffects; 
   imgEffects.Flags = TwainImageEffectsFlags.NegotiateBrightness | TwainImageEffectsFlags.NegotiateContrast | TwainImageEffectsFlags.NegotiateHighlight; 
   float contrast = imgEffects.Contrast; 
   float highlight = imgEffects.Highlight; 
   string msg = String.Format("Image Contrst = {0}\nImage Highlight = {1}", contrast, highlight); 
   MessageBox.Show(msg); 
 
   imgEffects.Brightness = 100; 
   session.ImageEffects = imgEffects; 
 
   TwainAcquirePageOptions pageOpts = session.AcquirePageOptions; 
   pageOpts.PaperSize = TwainPaperSize.A4; 
   pageOpts.PaperOrientation = TwainPaperOrientation.Landscape; 
   session.AcquirePageOptions = pageOpts; 
 
   session.Shutdown(); 
}

Requirements

Target Platforms

Reference

TwainImageEffects Structure

TwainImageEffects Members

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Help Version 22.0.2023.3.31

Leadtools.Twain Assembly

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