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This command adjusts the grayscale value of the output channel. Negative values add more black and positive values add more white color. You can simply move the slider to choose the brightness or just set it at the Brightness area. You may click Edit at the Menu bar or click Adjustments at the Process toolbar and choose Contrast.

Here is Contrast dialog box:

As Contrast dialog box opened you can see the preview of the result at the Preview area.

Click Apply you want to apply changes to one file. If you don't like effect, use CTRL+Z combination or Edit -> Undo from the menu bar to move back to the original image.

Choose the quality of the output JPEG file:

And click Save.

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