User Guide

User Guide Neat Image

37 20-Nov-03

In order to measure the dependence between the noise and brightness of an image (that is usually done

during fine-tuning a device noise profile, see Fine-tuning the rough device noise profile, page 19) it is

necessary to analyze many uniform areas in an image. Each individual analysis determines the

dependence in some narrow range of brightness values. The noise profile equalizer reflects this

dependence with a number of sliders that correspond to specific ranges of brightness individually for

each RGB color channel.

Initially, all the sliders are at their default positions. Analyses change their positions according to

characteristics of noise encountered.

It is possible that different analyses taken in the same brightness range will affect the same slider. In this

case, the slider's behavior is determined by the Combination of last fine-tuning analyses option:

• Take the maximum value (recommended)

Equalizer sets the slider’s RGB values to the maximum of the last two analyses (aggressive

filtration, maximum noise removal);

• Take the minimum value

Equalizer sets the slider’s RGB values to the minimum of the last two analyses (conservative

filtration, minimum image changes);

• Take the average value

Equalizer sets the slider’s RGB values to the average of the last two analyses;

• Take the last value

Equalizer sets the slider’s RGB values to the current analysis.

Save analyzed image area in profile (*.dnp file)

Turn this option on to make Neat Image saving analyzed image area into the device noise profile (*.dnp

file). This will increase the size of the *.dnp file but will also improve the compatibility with the future

versions of the software (Neat Image will be able to re-build the profile using the saved image area).

9.4. Profile matching options

Matching device noise profile folder/directory

Select the folder where Neat Image should look for device noise profiles to find one that best matches

the input image. This should be the topmost folder of all the subfolders with device noise profiles to be

checked during automatic matching.

By default, the PROFILES subfolder of Neat Image installation folder is used.

Matching parameters priorities

To automatically match profiles for the input image, Neat Image compares the device parameters of the

image and profiles in the Matching device noise profile folder/directory. Different parameters

usually have to be matched with different priority. Using these controls, you can select the priorities of

such parameters as Input device, ISO rate, Compression, Exposure:

• Match – the parameter should match exactly;

• High – it is highly important that the parameter is very close or matches exactly;

• Low – it is preferable that the parameter is close or matches exactly;

• Ignore – the parameter is not important at all.

Auto match on image open

Select this option to automatically find the best matching profile when the input image is opened.