function RgbToGray(RGBColor : TColor) : TColor;
var
Gray : byte;
sAlpha, sBeta, sGama: Real;
begin
sAlpha := 0.30; sBeta := 0.59; sGama := 0.11;//对三个值进行调整可得
Gray := Round(( * GetRValue(RGBColor)) +
( * GetGValue(RGBColor)) +
(sGama * GetBValue(RGBColor )));
Result := RGB(Gray, Gray, Gray);
end;
///////////////////////////////////////////////////
// Bitmap.ScanLine[X] 可以获取图像象素的内存地址,24Bits的Bitmap的每一象
// 素是以三原色RGB的次序存放的,改变RGB的值就可调节Bitmap的色彩.
// R, G, B: -255~255
procedure RGB(var Bmp: TBitmap; R, G, B: Integer);
var
X, Y: Integer;
I: Byte;
ColorTable: array[0..255] of TRGBColor;
pRGB: PRGBColor;
begin
for I := 0 to 255 do
begin
ColorTable.R := Byte(I + R);
ColorTable.G := Byte(I + G);
ColorTable.B := Byte(I + B);
end;
for Y := 0 to Bmp.Height - 1 do
begin
pRGB := Bmp.ScanLine[Y];
for X := 0 to Bmp.Width - 1 do
begin
pRGB.R := ColorTable[pRGB.R].R;
pRGB.G := ColorTable[pRGB.G].G;
pRGB.B := ColorTable[pRGB.B].B;
end;
Inc(pRGB);
end;
end;
// 改变图像的亮度,也只需调用RGB(Bmp, X, X, X)改变三原色.
// 调节Bitmap的对比度
// 应用公式: 新颜色值 = (旧颜色值 - 128) * 系数 + 128
procedure Contrast(var Bmp: TBitmap; Amount: Integer);
// Amount: -255~255
var
X, Y: Integer;
I: Byte;
ColorTable: array[0..255] of TRGBColor;
pRGB: PRGBColor;
begin
for I := 0 to 126 do
begin
Y := (Abs(128 - I) * Amount) div 256;
ColorTable.r := GetRValue(Byte(I - Y));
ColorTable.g := GetGValue(Byte(I - Y));
ColorTable.b := GetBValue(Byte(I - Y));
end;
for I := 127 to 255 do
begin
Y := (Abs(128 - I) * Amount) div 256;
ColorTable.r := GetRValue(Byte(I + Y));
ColorTable.g := GetGValue(Byte(I + Y));
ColorTable.b := GetBValue(Byte(I + Y));
end;
for Y := 0 to Bmp.Height - 1 do
begin
pRGB := Bmp.ScanLine[Y];
for X := 0 to Bmp.Width - 1 do
begin
pRGB.R := ColorTable[pRGB.R].R;
pRGB.G := ColorTable[pRGB.G].G;
pRGB.B := ColorTable[pRGB.B].B;
Inc(pRGB);
end;
end;
end;
// 改变饱和度
procedure Saturation(var Bmp: TBitmap; Amount: Integer); // Amount: 0~510
var
Grays: array[0..767] of Integer;
Alpha: array[0..255] of Word;
Gray, X, Y: Integer;
pRGB: PRGBColor;
I: Byte;
begin
for I := 0 to 255 do Alpha := (I * Amount) shr 8;
x := 0;
for I := 0 to 255 do
begin
Gray := I - Alpha;
Grays[X] := Gray; Inc(X);
Grays[X] := Gray; Inc(X);
Grays[X] := Gray; Inc(X);
end;
for Y := 0 to Bmp.Height - 1 do
begin
pRGB := Bmp.ScanLine[Y];
for X := 0 to Bmp.Width - 1 do
begin
Gray := Grays[pRGB.R + pRGB.G + pRGB.B];
pRGB.R := Byte(Gray + Alpha[pRGB.R]);
pRGB.G := Byte(Gray + Alpha[pRGB.G]);
pRGB.B := Byte(Gray + Alpha[pRGB.B]);
Inc(pRGB);
end;
end;
end;
//对于Jpg的处理,与Bitmap类似,因为TJpegImage内部有TBitmap.
//Bmp := TBitmap.Create;
//Bmp.Assign(Jpg);
procedure TForm1.FormCreate(Sender: TObject);
begin
bmp := TBitmap.Create;
bmp.Assign(image1.Picture.Graphic);
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
RGB(Bmp, StrToInt(edit1.text),StrToInt(edit2.text),StrToInt(edit3.text));
image1.Picture.Graphic.Assign(bmp);
image1.Refresh;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
Contrast(Bmp, strtoint(edit1.text));
image1.Picture.Graphic.Assign(bmp);
image1.Refresh;
end;
procedure TForm1.Button3Click(Sender: TObject);
begin
Saturation(Bmp, strtoint(edit1.text));
image1.Picture.Graphic.Assign(bmp);
image1.Refresh;
end;
