切换选项卡时图像文件 memory 使用量增加

Question

I'm working with a .net application that allows users to load an image on one tab and then switch to another tab to make notes. The idea is to not clear the image when navigating away from the tab so that users can toggle back and forth with ease. The problem I am running into is when switching back to the tab that contains the image, virtual and physical memory grows as if it's opening the image again. GC does get executed after a period of time however there are users that will switch between tabs several times in the matter of a minute or 2. Without clearing the image, is there any way to prevent the memory usage from growing?