image1 載入jpg檔，要進行畫圖，就出現以下錯誤：
Can only modify an image if it contains a bitmap
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if OpenPictureDialog1.Execute then begin
Image1.Picture.LoadFromFile(OpenPictureDialog1.FileName);
end;

procedure TfrmMain.Image1MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
Image1.Canvas.MoveTo(x,y);
end;

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對。自己直接利用 TJPEGIMAGE 轉換到 TImage的 Bitmap。
詳細自己查。

是不能!

節錄自help

TJPEGImage has an internal bitmap that represents the jpeg image. This internal image and the original source of the jpeg image are read only. TJPEGImage has properties that determine how each instance will handle color conversion, compression, decompression, performance, and so on.

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努力會更接近成功