ConvertToImage(IntPtr,long,RasterImage,int,int,int,int) Method

Summary

Converts image data in a buffer from one color conversion model to RGB\BGR, and sets the output as RasterImage.

Syntax

C++/CLI

Python

public void ConvertToImage( 
   IntPtr srcBuffer, 
   long srcBufferOffset, 
   RasterImage image, 
   int width, 
   int height, 
   int inAlign, 
   int outAlign 
)

public: 
void ConvertToImage(  
   IntPtr srcBuffer, 
   int64 srcBufferOffset, 
   RasterImage^ image, 
   int width, 
   int height, 
   int inAlign, 
   int outAlign 
)

def ConvertToImage(self,srcBuffer,srcBufferOffset,image,width,height,inAlign,outAlign):

Parameters

srcBuffer
A pointer to a buffer containing the input data.

srcBufferOffset
Offset to the first byte of the srcBuffer data buffer.

image
An RasterImage object that will hold the converted data.

width
Width of pixels to be processed.

height
Height of pixels to be processed.

inAlign
Each scanline in the input buffer is a multiple of inAlign bytes.

outAlign
Each scan line in the output buffer is a multiple of outAlign bytes.

Remarks

The active conversion method is specified in the ConversionParameters object when calling the Start method. To change the active method, use the SetParameters method. Only methods supported by the initialized converter should be specified. The conversion is done if the BGR or RGB Color Space was specified as the destination format when the Start method was called. For more information about Alignment Parameters, refer to Alignment Parameters. To convert to the Y41P type the input image width must be multiple of 8

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ColorConversion; 
 
using Leadtools.ImageProcessing; 
 
public string outputFile = Path.Combine(LEAD_VARS.ImagesDir, "WhitePoint.tif"); 
 
public void WhitePointPropertyExample() 
{ 
   // StartUp the ColorConversion. 
   RasterColorConverterEngine.Startup(); 
 
   // Input file name 
   string inputFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
 
   // Load the input image as Rgb 
   using (RasterCodecs codecs = new RasterCodecs()) 
   using (RasterImage rgbImage = codecs.Load(inputFileName, 24, CodecsLoadByteOrder.Rgb, 1, 1)) 
   { 
      // Get image buffer 
      byte[] rgbBuffer = new byte[rgbImage.BytesPerLine * rgbImage.Height]; 
      rgbImage.Access(); 
      for (int i = 0; i < rgbImage.Height; i++) 
         rgbImage.GetRow(i, rgbBuffer, i * rgbImage.BytesPerLine, rgbImage.BytesPerLine); 
      rgbImage.Release(); 
 
      // Initialize the Cmyk buffer array 
      byte[] cmykBuffer = new byte[rgbImage.Height * rgbImage.Width * 4]; 
 
      using (RasterColorConverterEngine colorConverterEngine = new RasterColorConverterEngine()) 
      { 
         // Conversion parameters 
         ConversionParameters convParams = new ConversionParameters(); 
         convParams.Method = ConversionMethodFlags.UseBuiltIn; 
         convParams.ActiveMethod = ConversionMethodFlags.UseBuiltIn; 
         convParams.Quantization = 8; 
         // WhitePoint 
         ConversionWhitePoint whitePoint = ConversionWhitePoint.Empty; 
         whitePoint.WhitePoint = ConversionWhitePointType.D50; 
         whitePoint.XWhite = 0; 
         whitePoint.YWhite = 0; 
         convParams.WhitePoint = whitePoint; 
         // CMYK 
         ConversionCmykParameters cmykParameters = new ConversionCmykParameters(); 
         cmykParameters.GcrLevel = 150; 
         convParams.CmykParameters = cmykParameters; 
 
         // Convert RGB to CMYK with above parameters 
         colorConverterEngine.Start(ConversionColorFormat.Rgb, ConversionColorFormat.Cmyk, convParams); 
         colorConverterEngine.Convert(rgbBuffer, // Source buffer 
             0, // Offset to the beginning of source buffer 
             cmykBuffer, // Destination buffer 
             0, // Offset to the beginning of destination buffer 
             rgbImage.Width, // Pixels width 
             rgbImage.Height, // Pixels height 
             rgbImage.BytesPerLine - (rgbImage.Width * (rgbImage.BitsPerPixel / 8)), // Scanline alignment for source buffer 
             0); // Scanline alignment for destination buffer 
         colorConverterEngine.Stop(); 
 
         // Save CMYK Image 
         // Split CMYK buffer to separate C, M, Y, and K planes 
         byte[] cBuffer = new byte[cmykBuffer.Length / 4]; 
         byte[] mBuffer = new byte[cmykBuffer.Length / 4]; 
         byte[] yBuffer = new byte[cmykBuffer.Length / 4]; 
         byte[] kBuffer = new byte[cmykBuffer.Length / 4]; 
         int index, cIndex, mIndex, yIndex, kIndex; 
         index = cIndex = mIndex = yIndex = kIndex = 0; 
         foreach (byte cmykByte in cmykBuffer) 
         { 
            switch (++index % 4) 
            { 
               case 0: 
                  kBuffer[kIndex++] = cmykByte; 
                  break; 
               case 1: 
                  cBuffer[cIndex++] = cmykByte; 
                  break; 
               case 2: 
                  mBuffer[mIndex++] = cmykByte; 
                  break; 
               case 3: 
                  yBuffer[yIndex++] = cmykByte; 
                  break; 
            } 
         } 
         // Combine planes into a single RasterImage with a page for each plane 
         using (RasterImage cPlane = new RasterImage(RasterMemoryFlags.Conventional, rgbImage.Width, rgbImage.Height, 0, RasterByteOrder.Gray, RasterViewPerspective.TopLeft, null, cBuffer, cBuffer.Length)) 
         using (RasterImage mPlane = new RasterImage(RasterMemoryFlags.Conventional, rgbImage.Width, rgbImage.Height, 0, RasterByteOrder.Gray, RasterViewPerspective.TopLeft, null, mBuffer, mBuffer.Length)) 
         using (RasterImage yPlane = new RasterImage(RasterMemoryFlags.Conventional, rgbImage.Width, rgbImage.Height, 0, RasterByteOrder.Gray, RasterViewPerspective.TopLeft, null, yBuffer, yBuffer.Length)) 
         using (RasterImage kPlane = new RasterImage(RasterMemoryFlags.Conventional, rgbImage.Width, rgbImage.Height, 0, RasterByteOrder.Gray, RasterViewPerspective.TopLeft, null, kBuffer, yBuffer.Length)) 
         { 
            cPlane.AddPage(mPlane); 
            cPlane.AddPage(yPlane); 
            cPlane.AddPage(kPlane); 
            // Save the 4 page CMYK plances Raster Image as a CMYK Image 
            codecs.SaveCmykPlanes(cPlane, outputFile, RasterImageFormat.TifCmyk, 0, 0, CodecsSavePageMode.Overwrite); 
         } 
      } 
   } 
 
   // Shutdown the ColorConversion. 
   RasterColorConverterEngine.Shutdown(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}