UVITEC – Cambridge
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The above graph demonstrates the basic principles of gamma adjustment:
- Black (pixel value = 0) remains black at all gamma values.
- White (pixel value = full scale) remains white at all gamma values.
- Gamma values greater than one lift the darker areas of the original image into the brighter areas of
the new image.
A gamma curve is smooth: there are no unexpected jumps or cut-offs. This means that when viewing
a gamma adjusted image, you will be able to see the details (intensity differences) in both the black
and white areas of the image.
When the bright areas of these types of images are correctly exposed, the darker areas can be so
dark that they are in effect invisible. Gamma Adjust can remedy this problem. The gamma adjustment
results in a better display of detail by lightening the darker areas without burning out bright areas or
lightening black areas:
Inverse the image
Select “Inverse the image” to inverse the grey level of the image. This makes a negative image.
Positive image
(white spot, black background)
Inverted image - Negative image
(black spot, light background)
Display the saturation
A saturated image is inappropriate for image quantification with image analysis software. The
saturation option allows you to visualize in red, pixels that have the maximum grey level in order to
avoid flattened peaks.
The maximum grey level depends of the bit-depth. For instance:
-
A 8-bit image has a maximum grey level of 255.
-
A 12-bit image has a maximum grey level of 4095.
Содержание FIREREADER MAX
Страница 33: ...UVITEC Cambridge 33 225 The Device Manager should appear as below for the FireReader and SL4 USB series ...
Страница 43: ...UVITEC Cambridge 43 225 The folder menu The image window ...
Страница 155: ...UVITEC Cambridge 155 225 Select from this list the actions you want to undo The Undo applies automatically on the image ...