QUALITY_MAX
camquality = ((QUALITY_MAX - val) * CAMQUALITY_MAX)
/ (QUALITY_MAX - QUALITY_MIN);
QUALITY_MIN, QUALITY_MAX, 1, QUALITY_DEF);
QUALITY_MIN, QUALITY_MAX, 1, QUALITY_DEF);
else if (new_qual > QUALITY_MAX)
new_qual = QUALITY_MAX;