查看图像文件而不锁定它。 （复制到内存？）

I want to be able to open/view a image (.jpg) without locking the file. Basically I have a program that lets the user choose a picture that will overwrite a picture. But the problem is that I display the image that is being overwritten. So how do I load an image without locking it?I want to be able to open/view a image (.jpg) w