Declaration

procedure HorizontalBlur32(ASource, ADest: TBitmap32; Radius: TFloat);
procedure GammaHorizontalBlur32(ASource, ADest: TBitmap32; Radius: TFloat);

Parameters

Parameter	Type	Description
ASource	TBitmap32	Source 32-bit bitmap to read pixels from.
ADest	TBitmap32	Destination 32-bit bitmap to receive the horizontally blurred output.
Radius	TFloat	Blur radius in pixels.

Description

HorizontalBlur32 and GammaHorizontalBlur32 performs a 1D horizontal-only Gaussian blur across bitmap scanlines.

These routines apply the recursive Gaussian filter along horizontal rows without performing the vertical filtering pass, producing horizontal streak or motion blur effects.

Variant Summary

Function	Description
HorizontalBlur32	1D horizontal Gaussian blur in standard non-linear sRGB space.
GammaHorizontalBlur32	1D horizontal Gaussian blur in linear light space (gamma-aware).

Example

var
  Src, Dst: TBitmap32;
begin
  Src := TBitmap32.Create;
  Dst := TBitmap32.Create;
  try
    Src.LoadFromFile('photo.png');

    // Apply horizontal motion blur with a 15.0 pixel radius
    HorizontalBlur32(Src, Dst, 15.0);

    Dst.SaveToFile('horizontal_motion_blur.png');
  finally
    Src.Free;
    Dst.Free;
  end;
end;

See also

• Blur32
• GammaBlur32
• GaussianRadiusToSigma