压缩图像文件并转换成BMP格式

function GraphicToBmp(P: TPicture; Quality: Integer = 80): TBitmap;

var

Jpg: TJpegImage;

begin

Result := TBitmap.Create;

with Result do

begin

Width := P.Width;

Height := P.Height;

Canvas.Draw(0, 0, P.Graphic);

end;

if Assigned(Result) then

begin

Jpg := TJpegImage.Create;

Jpg.Assign(Result);

Jpg.CompressionQuality := Quality;

Jpg.JPEGNeeded;

Jpg.Compress;

if Assigned(Jpg) then

begin

Jpg.DIBNeeded;

Result.Assign(Jpg);

end;

end;

end;