Shadow / highlight, virtual lighting and color-based corrections. LightMachine corrects brightness, contrast, color and saturation in specific image areas independently from each other. It basically consists of four different filters each split up into a simple mode suitable for beginners and a Pro mode with more features for more flexibility.

LightMachine Plugin Features:
1. Shadow/highlight, virtual lighting and color-based photo enhancement tools
2. Corrects brightness, contrast, color and saturation in shadows and highlights independently of each other
3. Place shadow/light spots similar to a real photo studio in Virtual Studio mode
4. Achieve special effects like glows, sunsets, high key and selective b/w effects, replace one color with another and simulate polarizing filters
5. Allows batch processing of image files
6. Processes 8bit and 16bit RGB images

Plugin Version
1. Runs as a filter plugin in Photoshop, Paint Shop Pro, Photoshop Elements, Photo-Paint, PhotoImpact, IrfanView and many other applications
2. Works as a smart filter in Photoshop
3. For Windows 98, NT, ME, 2000, XP, Vista, 7 (32-bit & 64-bit)
4. For MacOS X (PowerPC and Intel)

The Brightness/Contrast modes adjust brightness and contrast throughout the image which is nice as a starting point.
The Shadows/Highlights modes give you complete control over dark and bright image areas and let you correct them totally independently from each other with the help of sophisticated masking options.
The Virtual Studio modes allow you to place an unlimited number of shadow and light spots as if you were placing studio lights in a real photo studio. The intensity, size, ovality, angle, hardness and reflection properties of each spot can be adjusted precisely. Finally, the Colors modes let you selectively correct image objects of a specific color by clicking on them.

Limitations:
* Watermarks are added to the image after clicking OK

The license of this software is Free Trial Software, the price is $69.95, you can free download and get a free trial.