User Guide

User Guide Neat Image
Copyright © 1999-2003 by ABSoft. All rights reserved.
20
20-Nov-03
Size of an area (pixels) Which frequency components would be analyzed Rating
200x200 - 300x300 High, medium, low and very low Best
100x100 - 200x200 High, medium and low Good
60x60 – 100x100 High and medium Ok
30x30 – 60x60 High Poor
The selected area would be analyzed according to its frequency composition (of high, medium, low
and very low frequency image components). When a frequency component is not analyzed, all the
data related to this component are estimated (extrapolated). That is always not accurate; therefore, it
is best to choose large areas so that all the frequency components could be analyzed.
Warning
The selection status displays "signal clipping!" when the image in some of the channels (R,G,B)
is close to the dynamic range limit in the selected area. Fine-tuning a device noise profile using
the selected area could be inaccurate. Please try to avoid this for best results.
When you select an image area, its position in the brightness range is shown with red font color of
the value(s) of the corresponding slider(s)’ in the noise profile equalizer. Also, it is displayed by the
color indicators at the bottom of the equalizer.
2) Analyze selected image area with Fine-Tuning Analyzer
⇒ Click
(the Manual Fine-Tuning Analyzer button) or select the Profile | Fine-Tune Using
Selected Area menu item.
The analysis results are shown in noise profile equalizer. For uniform areas with noise only, the
corresponding slider(s) receives the ‘measured’ status – a green shading on the slider’s value, like
–27%. If an area with signal clipping has been used to analyze noise characteristics then the
corresponding slider(s) receives the ‘inaccurate’ status – a red shading, like –86%. When an area
with unexpectedly strong level of noise is encountered, an orange shading is applied, like +215%.
Warning
An orange shading is applied when the analyzed noise in the corresponding brightness range is
unexpectedly strong. There are several potential reasons for that:
• Fine-tuning is being done using a bad (e.g., containing visible details) image area;
• Wrong device noise profile is used (the profile’s device and device mode do not match
those of the analyzed image OR the (rough) profile has been built inaccurately);
• Noise in this image is unusual and contains strong variations.
An orange shading is a warning sign. It does not necessarily signify wrong measurement. Please
make you own judgment in this situation and if necessary rebuild the device noise profile or
select a more uniform area for fine-tuning.
A red shading is a sure sign of wrong measurement. You need to reset the corresponding slider or
undo the last analysis (see below).
3) If necessary, reset status of a slider (optional)
⇒ Click on the color shading of a slider to reset its status and value.
If a slider has red (or any other color) shading, you can safely reset it and analyze another part of the
input image to re-measure its value. There is no need to reset the entire equalizer because of one
wrong value.
4) If necessary, undo the last analysis (optional)
⇒ Click
(the Undo button) or select the Profile | Undo Last Fine-Tuning Analysis menu item.
Undoing the last fine-tuning analysis may be useful when a bad choice of image area has resulted in