TImageEnProc.GetRGBChannel

Declaration

function GetRGBChannel(Channel: TIEChannel; PixelFormat: TIEPixelFormat = ie24RGB): TIEBitmap; overload;
function GetRGBChannel(Channel: TIEChannel; var AveragePct: Double; PixelFormat: TIEPixelFormat = ie24RGB)): TIEBitmap; overload;
procedure GetRGBChannel(BitmapR, BitmapG, BitmapB: TIEBitmap; PixelFormat: TIEPixelFormat = ie24RGB)); overload;
procedure GetRGBChannel(BitmapR, BitmapG, BitmapB, BitmapA: TIEBitmap; PixelFormat: TIEPixelFormat = ie24RGB); overload;

Description

Return a Bitmap with the specified RGB channel or all three RGB channels. The resulting Bitmap is a gray level representation of the specified channel.
There is also a BitmapA overload available for ie32RGB format images.
ch is the RGB channel: iecRed, iecGreen, iecBlue.
AveragePct returns the average value for that channel in the image.
The PixelFormat of the resulting image(s) can be ie8g or ie24RGB.

To re-create the image from the RGB channel bitmaps, use SetFromRGBChannels.

Note: You must free the bitmap(s) returned by GetRGBChannel()

Demos

Image Testing

// Load test image
ImageEnView1.IO.LoadFromFile( 'D:\TestImage.jpg' );

  

// Return the Red channel of the image
bmp1 := ImageEnView1.Proc.GetRGBChannel( iecRed );

  

// Return the Green channel of the image
bmp1 := ImageEnView1.Proc.GetRGBChannel( iecGreen );

  

// Return the Blue channel of the image
bmp1 := ImageEnView1.Proc.GetRGBChannel( iecBlue );

  

Examples

Also see: Automated Samples

// Overload 1 Example
blue  := ImageEnView1.Proc.GetRGBChannel(iecBlue);
green := ImageEnView1.Proc.GetRGBChannel(iecGreen);
red   := ImageEnView1.Proc.GetRGBChannel(iecRed);

ImageEnView2.IEBitmap.Assign(blue);  // Show Blue channel
ImageEnView3.IEBitmap.Assign(green); // Show Green channel
ImageEnView4.IEBitmap.Assign(red);   // Show Red channel

ImageEnView2.Update();
ImageEnView3.Update();
ImageEnView4.Update();

blue .Free():
green.Free():
red  .Free():


// Overload 2 Example
ImageEnView1.Proc.GetRGBChannel(ImageEnViewRed.IEBitmap, ImageEnViewGreen.IEBitmap, ImageEnViewBlue.IEBitmap);
ImageEnViewRed.Update();
ImageEnViewGreen.Update();
ImageEnViewBlue.Update();

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