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Pixel Aid

 
The Pixel Aid is accessible from Tools tab
or with Alt+X shortcut.
 
Pixel Aid allows seeing various statistics for a part of the image (or the whole image), like Median, Standard Deviation and etc. It works in two modes - Bitmap or FITS.
 
 
The Pixel Aid use the common aid behavior in APT- dragging the window and placing the Source frame over the image part that you want to use.
 
Pixel Aid
 
1

Source

1. Source
 
It is a "transparent" window that shows the image under the Pixel Aid and defines what is the source to be used in the Aid.
 
2

Mode

2. Mode
 
The current mode.
 
3

Statistics

3. Statistics
 
The calculated statistics for the data in the Source.
 
 
4

One Pixel

4. One Pixel
 
Has effect only in FITS mode. When selected Pixel Aid shows the ADU value one pixel rather than calculating statistical data for Source image. In this mode there is a cross to show the inspected pixel.
 
Here is how  Pixel Aid looks in this mode.
 
 
5

Whole Image

5. Whole Image
 
Has effect only in FITS mode. When selected Pixel Aid shows the calculated statistical data for the whole image.