Features  /  Image Editing  / 

Brightness / Contrast

Underexposure and overexposure are two of the most common mistakes when taking photos. But don't consider images which suffer from them as completely destroyed! You can easily improve the way they look by adjusting their brightness and contrast with reaConverter.

This powerful batch image editor & converter makes the process really easy and quick.

Install reaConverter

Open Images

Open the images you intend to correct by adding them one by one, or by selecting an entire folder.

Brightness / Contrast

Go to the Edit images tab, press Add action → Color Adjustments → Brightness / Contrast.

Here you can easily adjust the quantity of light that appears in your image and check the result in real time by ticking the Preview button.

Save the Result

In the Saving options tab, you can opt for locating the output images in the same folder as the input ones, in a subfolder or in a new location altogether. Alternatively, you can save them online, in your Dropbox, Google Drive or Box.com account, among others. After making this choice, decide if you want to preserve the initial format of the images or convert them to a new one. JPG, PNG, TIF and BMP are just some of the available extensions, together with many other less known formats.

Finally, press the Start button and watch the dialogue to see how your files are being edited.

Video tutorial

Try Free Trial Version

You are welcome to contact our technical support when you have any questions about reaConverter.


Command-line Interface

Advanced users can adjust brightness and contrast using command-line interface in manual or automated mode. reaConverter Pro edition provides a command-line tool called cons_rcp.exe

Brightness/Contrast command-line example:

cons_rcp.exe -s "C:\Path_to\input_file.jpg" -o "C:\Path_to\output_file.jpg" -bc b10 c10


-bc (changes brightness and contrast balance)

Optional parameters:
  1. Brightness change (Syntax: b25, integer from -100 to 100)
  2. Contrast change (Syntax: c25, integer from -100 to 100)

  -bc b-10 c10

Command-line brightness/contrast tool is an advanced feature meant for professional use, and is available in Pro edition only.

Download reaConverter Pro with CLI