User Guide

User Guide Neat Image
Copyright © 1999-2003 by ABSoft. All rights reserved.
17 20-Nov-03
⇒ Use
(the Show negative button) on the toolbar to temporarily turn the image into its negative.
This can make finding the noise and noise-only areas easier in some cases.
If you cannot find a uniform area in the input image, you can use an alternative test image. The test
image is supposed to be produced by the same device working in the same or similar mode. The test
image can be just another image from the same series that contains uniform featureless area suitable for
analysis. Or you can prepare a special test image using the calibration target, which is specifically
designed to provide several featureless areas of different brightness. See Using the calibration target,
page 23, for more details.
⇒ To open the test image, click
(the Open test image… button) on the
toolbar (or select the File | Open Test Image… menu item). The test image will only replace the
input image in the Device Noise Profile tab for the purpose of building a device noise profile.
or
Paste the test image from the Windows clipboard or drag and drop it from another application to the
image viewer in the Device Noise Profile tab.
3) Select found uniform image area
⇒ Use the mouse to select a uniform image area: 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 dynamically indicating whether the
chosen area is large enough for analysis.
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. A device noise profile built using the
selected area could be inaccurate. Please try to avoid this for best results.
4) 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 Using Selected Area menu item.
The program will measure the noise characteristics of the image acquisition device by analyzing
uniform areas of the image. You only need to make this analysis once to build a rough noise profile.
5) Describe device name and device mode
⇒ Use the Device name and Device mode fields on the Device Noise
Profile panel.
Here, you can specify the model of image acquisition device used.
For example, "Olympus C5050Z".
Also, you can describe the device mode. Specify parameters used to
take the image(s). For example, this can be something like the data
in the text box on the right.
⇒ Neat Image can automatically fill out the Device name and Device mode fields in the Device Noise
Profile box. The program can extract these data when EXIF data fields are available in the image.
Use the EXIF->Profile button on the toolbar or the Profile | Copy EXIF Data to Profile menu
item to do that.
ISO level: 200
Compression: 5 bits/pixel
Exposure time: 1/80s
Exposure bias: 0.00 eV
White balance: Defaul
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