Retrieve the minimum, maximum and default gamma values.
This method will return FALSE if gamma correction is not supported on this. See supports_gamma_correction.
| this |
a Camera |
| min_value |
Pointer to store the minimum gamma value, or null |
| max_value |
Pointer to store the maximum gamma value, or null |
| default_value |
Pointer to store the default gamma value, or null |
|
true if successful, false otherwise |