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var
ABMP: Vcl.Graphics.TBitmap;
DestRC, SourceRC: TRect;
AJPEGImage: TJPEGImage;
begin
ABMP := Vcl.Graphics.TBitmap.Create();
AJPEGImage := TJPEGImage.Create;
AJPEGImage.CompressionQuality := 100;
AJPEGImage.Compress;
try
ABMP.LoadFromFile('c:\1.bmp');
AJPEGImage.Assign(ABMP);
AJPEGImage.SaveToFile('c:\1.jpg');
finally
ABMP.Free;
AJPEGImage.Free;
end;
end;