User manual

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CLICK Pro User Manual
v. 1.0
next image selected. You will be asked, too, if you want to apply the same saving options in
all images, in order to speed up adjustments (see section 4.3.8.5). To go back to a previous
image, press “Back” button (A).
Click OK button to exit Adjustments screen. It will appear the same form to validate or
discard the changes of the current image.
4.3.8.1 – General Adjustment
This section on adjustments is for changing the following parameters very quickly:
The three buttons on the left correspond to the colour balance of the Cyan, Magenta and
Yellow channels, or the equivalents Red, Green and Blue, in that order. The three buttons on
the right correspond to the balance of Brightness, Contrast and Saturation.
There are one group of plus and minus buttons for each kind of adjustment.
To change one of these values, click on it and it will be selected. Then, click plus or minus
buttons on the right of the selected button to increase / decrease the adjustment of the value.
Note that one plus click increases on 50 and one minus click decreases on 25 (except
Saturation, that increases 100 and decreases 50 because the changes are less perceptible).
This kind of functionality allows you to correct an image very quickly.
If you want to increase or decrease the values more accurately, you can keep plus or minus
key down and then, the values will increase or decrease slowly. On the other hand, you can
enter the number that you want for each parameter manually for perfect accuracy.
4.3.8.2 – Histogram Adjustment
Click the Histogram button show the histogram tools.
What is the histogram?
Basically, it provides information on the distribution of the levels of intensity (light) in the
whole image. This can be highly useful in analysing and enhancing an image that seems to
be flat or rather “undynamic”. This is a very common problem in many digital cameras on the
market, as well as in scanners, although the latter tend to have built–in automatic image
enhancement tools when they have been bought with the device.
In the histogram, the horizontal axis has 256 different values (0 to 255) which are really
the different values of intensity that a pixel or dot of the image may have.
The vertical axis indicates how many real pixels of the image analysed have the value of the
X axis. The example shows that around a brightness value of 50 (horizontal axis), there are
many pixels or points of the image (vertical axis). We are talking about an image that tends
towards dark values.