You can set the brightness and the contrast with the help of the sliders. You can repair photos with dark background photo if you increase the brightness and contrast values in paralel.Note:
You can reset the default values by clicking on the Reset button.
If you clear the preview checkbox, you can see the original photo without brightness/contrast adjustment. If the preview function is inactive you cannot adjust the brightness/contrast values and you cannot navigate to the next page with the next button.
Click on the back button to go back to the previous page to upload a different photo.
Click on the next button, when you finished the brightness and contrast adjustment.
Note: The brightness and contrast adjustments won't be realized if you leave the page without using the next button.