Zoom+Tool

Zoom Tool
Click on the zoom tool - small magnifying glass - and the cursor changes to a small magnifying glass OR press short cut Z. Either click with left mouse button to keep zooming in until you can see the individual pixels. Press teh Alt key and the zoom in becomes a zoom out - left click mouse button. OR click zoom button then click and drag a rectangleand let it go and it will just zoom in on that area.

If you double click on the hand symbol directly above the zoom tool on the side, the picture returns to normal size.