====== Image statistics ======

From the menu Tools -> Image statistics

{{:en:documentation:img_stat.png|}}

Show statistics about the pixel values in the current image.\\
When the button **Select area** is checked you can select an area of the image to get the statistics from.

This show the following:
  ***Pixel count:** the number of pixel used to compute the statistics.
  ***Min:** The minimal value of a pixel.
  ***Max:** The maximal value of a pixel.
  ***Mode:** The mode of the image, i.e. the most frequent value. This is a good estimate of the sky background. 
  ***Median** The median value of the image.
  ***Mean:** The mean value of all the pixel.
  ***Std.Dev:** The standard deviation from the mean value.
  ***Mean2:** The sigma clipped mean value.
  ***Std.Dev2:** The sigma clipped standard deviation.

If the image is plate solved the following values are added:
  ***Center RA2000:** The J2000 right ascension of the image center.
  ***Center Dec2000:** The J2000 declination of the image center.
  ***FOV:** The image size width x height in minutes of arc.
  ***Image scale:** The image scale in second of arc per pixel.
  ***Actual focal length:** The real focal length of the instrument, can be used to update the value in the Preferences.