Sub-step A. Rough analysis

Rough analysis requires only one uniform featureless image area. You have to manually find and analyze it:

1. Find a uniform featureless image area

• Scroll, pan, zoom the image in the viewer in the Device Noise Profile tab to find a uniform image area.
  
  The area should be at least 60x60 pixels large. That is the minimum size; the recommended size is 100x100 pixels or more.
  
  See examples of uniform image areas.
  
  If you cannot find a uniform area in the input image, consider using an alternative regular image or use the Calibration Target as explained in Stage I. Case of building a profile using the Calibration Target.
  
• Use Image Viewer Adjustments (optional)
  The Image Viewer Adjustments window helps to adjust the image viewers of the Filtration Job Editor. You can operatively adjust the brightness and contrast of the viewers to better see the noise in an interesting image area (for example in a very dark part of the image). More information about this tool is available in the Image Viewer Adjustments subsection.
  

2. Select found uniform image area

• Use the mouse to select the uniform image area that you have found: press the left button, drag the mouse and then release the button.
  
  The selection should be at least 60x60 pixels large; the recommended size is 100x100 pixels or more. The selection frame will change its thickness according to the selection size. When you are selecting an area, the selection status in the Rough Noise Analyzer box is also dynamically indicating whether the chosen area is large enough for analysis.
  
  

  Warning

  1) The selection status and selection frame display "signal clipping!" when the image (some of its color channels) is close to the dynamic range limit in the selected area. A device noise profile built using the selected area could be inaccurate. Please try to avoid this for best results. 2) The selection status and selection frame display "area not uniform in ... channel(s)" when the image (some of its color channels) contains some details or the noise is not uniform in the selected area. A device noise profile built using the selected area could be inaccurate. Please try to avoid this for best results.

3. Analyze selected image area with Rough Noise Analyzer

• Click    (the Rough Noise Analyzer button) in the Rough Noise Analyzer box or select the Profile | Build Rough Profile Using Selected Area menu item.
  
  Neat Image will measure the noise characteristics of the image acquisition device by analyzing the selected uniform image area. You only have to make this analysis once to create a rough noise profile.

Sub-step A :: Sub-step B