31
void writeExifData(const std::string& filename, const std::string& comment, float expotime = 100.0f);
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32
void copyExifData(const std::string& from, const std::string& to, bool dont_overwrite);
33
33
float obtain_avg_lum(const std::string& filename);
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34
int obtain_rotation(const std::string& filename);