1. Press at the toolbar, and such a dialog box will
pop up:
Through this dialog box, you can adjust the distribution of brightness levels of the image. The triangular handles under the diagrams are of three colors: the black handle (the left one) for the adjustment of the lower limit of input/output level(the values shown in the left entry boxes); the gray handle (the middle one) for the gamma(the value shown in the middle entry box); and the white handle (the right one) for the upper limit(the value shown in the right entry boxes).
2. Choose the channel to which you will apply your adjustment.
3. Drag the handles to adjust the input/outpu level, and the values are displayed in the Input Level and Output Level entry boxes.
Or you can enter the desired values in the appropriate entry boxes.
You can also press the "Auto" button to have MiraPhoto adjust the color level
automatically.
4. Press the "OK" button to save your settings and close this dialog box.
*To cancel your adjustment, press the "Cancel" button or "Reset" button to restore the default setting.