Windows Forms(C#): Image processing app UI design

Currently I'm developing image processing application with Windows Forms. My app has some stages like:

1. Find line between 2 pages on image;
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2. Deskew image;
3. Find content area;
4. ...

For now I have TabControl. Each tab has it's own PictureBox for one stage. When I'm going through stages, appropriate tab is selected. On the last stage I have about 5 PictureBoxes with large images. This approach is not very good because at the end there is large memory consumption.

But I can't find out another approach. Maybe you can propose something?