基本图象处理代码(2)

[亮度、对比度、饱和度的调整]

//亮度调整
procedure BrightnessChange(const SrcBmp,DestBmp:TBitmap;ValueChange:integer);
var
i, j: integer;
SrcRGB, DestRGB: pRGBTriple;
Table: array[0..255]of Byte;
begin
if ValueChange > 0 then
for i := 0 to 255 do
Table[i]:=Byte(i ((ValueChange * (i xor 255)) shr 8))
else
for i := 0 to 255 do
Table[i]:=Byte(i - ((Abs(ValueChange) * i) shr 8));
for i := 0 to SrcBmp.Height - 1 do
begin
SrcRGB := SrcBmp.ScanLine[i];
DestRGB := DestBmp.ScanLine[i];
for j := 0 to SrcBmp.Width - 1 do
begin
DestRGB^.rgbtRed := Table[SrcRGB^.rgbtRed];
DestRGB^.rgbtGreen := Table[SrcRGB^.rgbtGreen];
DestRGB^.rgbtBlue := Table[SrcRGB^.rgbtBlue];
Inc(SrcRGB);
Inc(DestRGB);
end;
end;
end;

//对比度调整
procedure ContrastChange(const SrcBmp,DestBmp:TBitmap;ValueChange:integer);
var
i, j: integer;
SrcRow, DestRow: pRGBTriple;
begin
for i := 0 to SrcBmp.Height - 1 do
begin
SrcRow := SrcBmp.ScanLine[i];
DestRow := DestBmp.ScanLine[i];
for j := 0 to SrcBmp.Width - 1 do
begin
if ValueChange>=0 then
begin
if SrcRow.rgbtRed >= 128 then
DestRow.rgbtRed := Min(255, SrcRow.rgbtRed (Abs(128 - SrcRow.rgbtRed) * ValueChange) div 128)
else
DestRow.rgbtRed := Max(0, SrcRow.rgbtRed - (Abs(128 - SrcRow.rgbtRed) * ValueChange) div 128);
if SrcRow.rgbtGreen >= 128 then
DestRow.rgbtGreen := Min(255, SrcRow.rgbtGreen (Abs(128 - SrcRow.rgbtGreen) * ValueChange) div 128)
else
DestRow.rgbtGreen := Max(0, SrcRow.rgbtGreen - (Abs(128 - SrcRow.rgbtGreen) * ValueChange) div 128);
if SrcRow.rgbtBlue >= 128 then
DestRow.rgbtBlue := Min(255, SrcRow.rgbtBlue (Abs(128 - SrcRow.rgbtBlue) * ValueChange) div 128)
else
DestRow.rgbtBlue := Max(0, SrcRow.rgbtBlue - (Abs(128 - SrcRow.rgbtBlue) * ValueChange) div 128);
end
else
begin
if SrcRow.rgbtRed >= 128 then
DestRow.rgbtRed := Max(128, SrcRow.rgbtRed (Abs(128 - SrcRow.rgbtRed) * ValueChange) div 128)
else
DestRow.rgbtRed := Min(128, SrcRow.rgbtRed - (Abs(128 - SrcRow.rgbtRed) * ValueChange) div 128);
if SrcRow.rgbtGreen >= 128 then
DestRow.rgbtGreen := Max(128, SrcRow.rgbtGreen (Abs(128 - SrcRow.rgbtGreen) * ValueChange) div 128)
else
DestRow.rgbtGreen := Min(128, SrcRow.rgbtGreen - (Abs(128 - SrcRow.rgbtGreen) * ValueChange) div 128);
if SrcRow.rgbtBlue >= 128 then
DestRow.rgbtBlue := Max(128, SrcRow.rgbtBlue (Abs(128 - SrcRow.rgbtBlue) * ValueChange) div 128)
else
DestRow.rgbtBlue := Min(128, SrcRow.rgbtBlue - (Abs(128 - SrcRow.rgbtBlue) * ValueChange) div 128);
end;
Inc(SrcRow);
Inc(DestRow);
end;
end;
end;

//饱和度调整
procedure SaturationChange(const SrcBmp,DestBmp:TBitmap;ValueChange:integer);
var
Grays: array[0..767] of Integer;
Alpha: array[0..255] of Word;
Gray, x, y: Integer;
SrcRGB,DestRGB: pRGBTriple;
i: Byte;
begin
ValueChange:=ValueChange 255;
for i := 0 to 255 do
Alpha[i] := (i * ValueChange) Shr 8;
x := 0;
for i := 0 to 255 do
begin
Gray := i - Alpha[i];
Grays[x] := Gray;
Inc(x);
Grays[x] := Gray;
Inc(x);
Grays[x] := Gray;
Inc(x);
end;
for y := 0 to SrcBmp.Height - 1 do
begin
SrcRGB := SrcBmp.ScanLine[Y];
DestRGB := DestBmp.ScanLine[Y];
for x := 0 to SrcBmp.Width - 1 do
begin
Gray := Grays[SrcRGB.rgbtRed SrcRGB.rgbtGreen SrcRGB.rgbtBlue];
if Gray Alpha[SrcRGB.rgbtRed]>0 then
DestRGB.rgbtRed := Min(255,Gray Alpha[SrcRGB.rgbtRed])
else
DestRGB.rgbtRed := 0;
if Gray Alpha[SrcRGB.rgbtGreen]>0 then
DestRGB.rgbtGreen := Min(255,Gray Alpha[SrcRGB.rgbtGreen])
else
DestRGB.rgbtGreen := 0;
if Gray Alpha[SrcRGB.rgbtBlue]>0 then
DestRGB.rgbtBlue := Min(255,Gray Alpha[SrcRGB.rgbtBlue])
else
DestRGB.rgbtBlue := 0;
Inc(SrcRGB);
Inc(DestRGB);
end;
end;
end;

//RGB调整
procedure RGBChange(SrcBmp,DestBmp:TBitmap;RedChange,GreenChange,BlueChange:integer);
var
SrcRGB, DestRGB: pRGBTriple;
i,j:integer;
begin
for i := 0 to SrcBmp.Height- 1 do
begin
SrcRGB := SrcBmp.ScanLine[i];
DestRGB :=DestBmp.ScanLine[i];
for j := 0 to SrcBmp.Width - 1 do
begin
if RedChange> 0 then
DestRGB.rgbtRed := Min(255, SrcRGB.rgbtRed RedChange)
else
DestRGB.rgbtRed := Max(0, SrcRGB.rgbtRed RedChange);

if GreenChange> 0 then
DestRGB.rgbtGreen := Min(255, SrcRGB.rgbtGreen GreenChange)

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