MinValue Property

Summary

Gets or sets the images minimum grayscale value.

Syntax

Objective-C

C++/CLI

Java

Python

public int MinValue { get; set; }

@property (nonatomic, assign) NSInteger minValue

public int getMinValue(); 
public void setMinValue( 
   int intValue 
);

public: 
property int MinValue { 
   int get(); 
   void set (    int ); 
}

MinValue # get and set (RasterImage)

Property Value

Minimum grayscale value.

Remarks

For every value between 0 and MinValue, Black (RGB(0,0,0)) will be used. For values between MinValue and MaxValue, the gray value to be displayed is calculated by : gray = (index - MinValue) * 255 / (MaxValue - MinValue).

index is the intensity value of the pixel. If the intensity value is > MaxValue, the color will be White. If the intensity value is < MinValue, the color will be Black. For those intensity values between MinValue and MaxValue, the above equation is used to determine the color, with index equal to the intensity value.

For more information, refer to Grayscale Images.

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Core; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Dicom; 
using Leadtools.Drawing; 
using Leadtools.Controls; 
using Leadtools.Svg; 
 
 
public void WindowLevelExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
   // Load an image that has BottomLeft ViewPerspective 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1.CMP")); 
 
   // Change the image to 16-bit grayscale  
   GrayscaleCommand grayscaleCmd = new GrayscaleCommand(16); 
   grayscaleCmd.Run(image); 
 
   MinMaxBitsCommand minMaxBitsCmd = new MinMaxBitsCommand(); 
   minMaxBitsCmd.Run(image); 
 
   MinMaxValuesCommand minMaxValuesCmd = new MinMaxValuesCommand(); 
   minMaxValuesCmd.Run(image); 
 
   int lowBit = minMaxBitsCmd.MinimumBit; 
   int highBit = minMaxBitsCmd.MaximumBit; 
 
   int size = (1 << (image.HighBit - image.LowBit + 1)); 
   RasterColor[] palette = new RasterColor[size]; 
 
   // fill the first half of the LUT with RED 
   for (int x = 0; x < size / 2; x++) 
   { 
      palette[x].R = 255; 
      palette[x].G = 0; 
      palette[x].B = 0; 
      palette[x].Reserved = 0; 
   } 
 
   int minVal = minMaxValuesCmd.MinimumValue; 
   int maxVal = minMaxValuesCmd.MaximumValue; 
 
   // Fill the rest with gray values  
   for (int x = (size / 2); x < size; x++) 
   { 
      palette[x].R = Convert.ToByte(Math.Min(255, ((x - minVal) * 255 / (maxVal - minVal)))); 
      palette[x].G = palette[x].R; 
      palette[x].B = palette[x].R; 
      palette[x].Reserved = 0; 
   } 
   image.WindowLevel(lowBit, highBit, palette, RasterWindowLevelMode.PaintAndProcessing); 
 
   codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1_WindowLevel.BMP"), RasterImageFormat.Bmp, 0); 
 
   image.Dispose(); 
   codecs.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

Requirements

Target Platforms

Reference

RasterImage Class

RasterImage Members

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Help Version 23.0.2024.5.22

Leadtools Assembly

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Leadtools Namespace

Leadtools.ImageProcessing Namespace

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