Free batch advanced image converter and image editing application.
reaConverter Lite can handle ultra-fast batch conversions between JPEG, GIF, TIFF, PNG and BMP images with access to lots of advanced picture editing techniques such as:

Alteration and Orientation tools: Resize, Crop, Canvas Size, Rotate, Mirror, Auto Crop, Auto Rotate

Adjustments tools: Brightness/Contrast, Color Balance, Gamma Correction, Hue/Saturation, White Balance, Photo Filter, Black & White, Invert, Color Depth

Creative Retouching tools: Sharpen, Blur, Anti-aliasing, Stylize, Border, Shadow, Noise, Selective Color Change, Background Change, Lens Correction, JPEG Artifacts Remove, Black and White Noise Remove

Watermarking tools: Image Watermark, Text Watermark, Dynamic Watermark, Primitive Drawings

Free version of reaConverter Lite also supports all formats features and tuning like:
Change Color Space (CMYK, RGB, YCbCr, ...), Copy Metadata (EXIF, IPTC), Transfer Alfa Channel, Set DPI, Manage ICC Profile, Control Bit Depth, Format-Specific Saving Settings, Alter Multi-Page Settings, Select Transparency Color, Add TIFF Compression (CCITT, LZW, RLE, ...), Set Quality.

Additional free features: Process Files from ZIP Folders, Create Thumbnails, Move Original Files, Move Unprocessed Files, Delete Files After Conversion, Set Manual File Date, Keep Path Info and Folders Structure, Name Files with Macros, EXIF and TIFF Tags, Skip Blank Files or Pages.

reaConverter Lite is uber-powerful and free image conversion tool with a great variety of features. It gives advanced solution for image processing and tuning.