ImageEn, unit imageenproc |
|
TImageEnProc.Threshold
Declaration
procedure Threshold(DownLimit, UpLimit, DownVal, UpVal: TRGB); overload;
procedure Threshold(LoThreshold, HiThreshold: Integer; Red, Green, Blue: Boolean); overload;
Description
Replace colors above and below a threshold.
First overload assigns the DownVal color to all colors smaller or equal to DownLimit, and UpVal to all colors greater than UpLimit.
With second overload, you specify the low and high pixel value (LoThreshold and HiThreshold). Red, Green and Blue specify where to apply the threshold operation.
Note:
◼A UI for this is available to your users in the
Image Processing dialog◼If the image
PixelFormat is not ie24RGB or ie32RGB, it will be converted
| Demos\ImageEditing\EveryMethod\EveryMethod.dpr |
// Load test image
ImageEnView1.IO.LoadFromFile( 'D:\TestImage.jpg' );
// Change all values less than R/G/B of 64 to black
ImageEnView1.Proc.Threshold( CreateRGB(64, 64, 64), CreateRGB(255, 255, 255), CreateRGB(0, 0, 0), CreateRGB(255, 255, 255) );
// Change all values greater than R/G/B of 192 to white
ImageEnView1.Proc.Threshold( CreateRGB(0, 0, 0), CreateRGB(192, 192, 192), CreateRGB(0, 0, 0), CreateRGB(255, 255, 255) );
// Change values with a red value greater than 192 to pure red
ImageEnView1.Proc.Threshold( CreateRGB(0, 0, 0), CreateRGB(192, 0, 0), CreateRGB(0, 0, 0), CreateRGB(255, 0, 0) );
See Also
◼CreateRGB◼TRGB2TColor◼TColor2TRGB