/usr/share/sensor_msgs/msg/Image.msg is in libsensor-msgs-dev 1.12.3-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | # This message contains an uncompressed image
# (0, 0) is at top-left corner of image
#
Header header # Header timestamp should be acquisition time of image
# Header frame_id should be optical frame of camera
# origin of frame should be optical center of cameara
# +x should point to the right in the image
# +y should point down in the image
# +z should point into to plane of the image
# If the frame_id here and the frame_id of the CameraInfo
# message associated with the image conflict
# the behavior is undefined
uint32 height # image height, that is, number of rows
uint32 width # image width, that is, number of columns
# The legal values for encoding are in file src/image_encodings.cpp
# If you want to standardize a new string format, join
# ros-users@lists.sourceforge.net and send an email proposing a new encoding.
string encoding # Encoding of pixels -- channel meaning, ordering, size
# taken from the list of strings in include/sensor_msgs/image_encodings.h
uint8 is_bigendian # is this data bigendian?
uint32 step # Full row length in bytes
uint8[] data # actual matrix data, size is (step * rows)
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