HTC One M9 User Manual page 116

116 Camera
Choose an ISO level or set it back to Auto. Higher ISO works best in
low light conditions.
Choose an exposure value. The higher the exposure value is, the
brighter your photos or videos will be.
Choose a white balance setting that matches your current lighting
environment.
Choose from more basic and advanced camera settings.
Choosing a capture mode
Switch to a capture mode to use for taking photos or videos.
On the Viewfinder screen, tap
You can also just swipe across the Viewfinder screen to switch between capture modes:
In landscape view, swipe from the top or bottom edge of the screen.
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In portrait view, swipe from the left or right edge of the screen.
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Zooming
Before taking a photo or video, slide two fingers apart to zoom in or together to
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zoom out.
When you're recording video, you can freely zoom in or out while recording.
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, and then tap a capture mode.