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//ͼƬѹËõ

procedure TMainForm.ChangeImageFormate;
var Bitmap : TBitmap;
Zoom : Integer;
begin
Bitmap := TBitmap.Create; //1
try
with ImageCert do begin
Bitmap.Assign(Picture.Graphic); //2
Picture := nil; //3
Zoom := Max(Bitmap.Width div Width,Bitmap.Height div Height)+1; //4
Width := Bitmap.Width div Zoom; //5
Height := Bitmap.Height div Zoom; //6
Canvas.StretchDraw(Rect(0,0,Width,Height),Bitmap); //7
end;
finally
Bitmap.Free;
end;
end;

//ͼƬµÄÐýת

procedure TMainForm.RotateImage;
var x,y : Integer;
TmpBitMap : TBitmap;
begin
TmpBitMap := TBitmap.Create;
try
TmpBitMap.Assign(ImageCert.Picture.Graphic);
with ImageCert do begin
Picture.Bitmap.Height := TmpBitMap.Width;
Picture.Bitmap.Width := TmpBitMap.Height;
for x:=0 to Height do
for y:=0 to Width do
Canvas.Pixels[TmpBitMap.Height-x,y] := TmpBitMap.Canvas.Pixels[y,x];
Height := TmpBitMap.Width;
Width := TmpBitMap.Height;
end;
finally
TmpBitMap.Free;
end;
end;