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Delphi source code for Graphic >> Convert a bitmap to sepia or greyscale


Category: Graphic
Title: Convert a bitmap to sepia or greyscale
Date added: 15.03.2006
Hits: 10302



function bmptosepia(const bmp: TBitmap; depth: Integer): Boolean;
var
color,color2:longint;
r,g,b,rr,gg:byte;
h,w:integer;
begin
  for h := 0 to bmp.height do
  begin
    for w := 0 to bmp.width do
    begin
    color:=colortorgb(bmp.Canvas.pixels[w,h]);
    r:=getrvalue(color);
    g:=getgvalue(color);
    b:=getbvalue(color);
    color2:=(r+g+b) div 3;
    bmp.canvas.Pixels[w,h]:=RGB(color2,color2,color2);
    color:=colortorgb(bmp.Canvas.pixels[w,h]);
    r:=getrvalue(color);
    g:=getgvalue(color);
    b:=getbvalue(color);
    rr:=r+(depth*2);
    gg:=g+depth;
    if rr <= ((depth*2)-1) then
    rr:=255;
    if gg <= (depth-1) then
    gg:=255;
    bmp.canvas.Pixels[w,h]:=RGB(rr,gg,b);
    end;
  end;
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
  bmptosepia(image1.picture.bitmap, 20);
end;

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