Epson EB-L770U User Manual page 168

You see this screen:
4. Select one of the following as the Scale setting:
• Auto to automatically adjust the clipped areas according to the Edge Blending and Tiling
settings you selected
• Manual to adjust the clipped areas manually
5. Select the Scale Mode setting and select one of these options:
• Zoom Display to maintain the image aspect ratio as you scale the image
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