  The Rosetta space probe accompanied comet 67P/Churyumov-Gerasimenko for more
than two years, obtaining an unprecedented amount of unique data of the comet
nucleus and inner coma. This work focuses identifying the source regions of
faint jets and outbursts and on studying the spectrophotometric properties of
some outbursts. We use observations acquired with the OSIRIS/NAC camera during
July-October 2015, that is, close to perihelion.
  More than 200 jets of different intensities were identified directly on the
nucleus. Some of the more intense outbursts appear spectrally bluer than the
comet dark terrain in the vivible-to-near-infrared region. We attribute this
spectral behavior to icy grains mixed with the ejected dust. Some of the jets
have an extremely short lifetime. They appear on the cometary surface during
the color sequence observations, and vanish in less than some few minutes after
reaching their peak. We also report a resolved dust plume observed in May 2016
at a resolution of 55 cm/pixel, which allowed us to estimate an optical depth
of $\sim$0.65 and an ejected mass of $\sim$ 2200 kg.
  We present the results on the location, duration, and colors of active
sources on the nucleus of 67P from the medium-resolution (i.e., 6-10 m/pixel)
images acquired close to perihelion passage. The observed jets are mainly
located close to boundaries between different morphological regions.
  Jets depart not only from cliffs, but also from smooth and dust-covered
areas, from fractures, pits, or cavities that cast shadows and favor the
recondensation of volatiles. This study shows that faint jets or outbursts
continuously contribute to the cometary activity close to perihelion passage,
and that these events are triggered by illumination conditions. Faint jets or
outbursts are not associated with a particular terrain type or morphology.
