GoPro Hero 4 Silver User Manual page 72

/ Protune
Protune for Photo ISO Limit
Setting
800 (default)
400
200
100
Sharpness controls the sharpness of your video footage or photos.
Sharpness Setting
High (default)
Medium
Low
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Resulting Quality
Brighter photo in very low light, increased
image noise
Brighter photo in very low light, moderate
image noise
Darker photo in indoor lighting, marginal
image noise
Darker photo in indoor lighting, minimal
image noise
SHARPNESS
Resulting Quality
Ultra-sharp video or photo
Moderately sharp video or photo
Softer video or photo
2/5/15 3:15 PM