Best Offline Image Optimizer !!

Being a Web Developer I always need a Good Image Optimizer !! And after trying all the tools i finally came up with the Best Tool !!! 

It's nothing but the RIOT (Radical Image Optimization Tool) . You can Use this too to optimize the single images or the many images at a time (Batch). You can also set various properties also it let you to visually adjust compression parameters while keeping minimum filesize. 

I will recommend this tool for Image optimization !!

The image optimizer is lightweight, fast and simple to use, yet powerful for advanced users.
You will be able to control compression, number of colors, metadata settings and much more, and select image format (JPEG, GIF or PNG) for your output file.

Main features

• open many image types including rare/scientific types
• save and optimize JPEG, GIF and PNG with a simple, clean user interface
• works in dual view: (original – optimized image) or single view (optimized image).
  Automatic preview of resulting image
• in-place compare function (alternativelly display the original image over the optimized image to notice small pixel changes)
• compress files to desired filesize threshold
• fast processing (all is done in memory);
  see instant results including resulting filesize
• batch support (process multiple files at once)
• transparency handling options
• decide if you want to keep metadata (comments, IPTC, Adobe XMP, EXIF profiles, ICC profiles).
  Unsupported metadata is removed
• transfer metadata between image formats (destination format must support them)
• common tools: pan and zoom, rotate, flip
• basic image adjustments: brightness, contrast, gamma, invert
• visually reduce number of unique colors for PNG and GIF images in order to reduce filesize
  (two quantization methods are available: Xiaolin Wu and NeuQuant neural net)
• resize image by using well known resample filters (ex: Lanczos3, Catmull Rom, Bicubic, and others)
• out-of-the-box support for external PNG optimizers (optipng, pngout, etc)
• the compression and the results are comparable to those of commercial products, even higher.
• Adaptive logarithmic tone mapping algorithm (Drago) used for HDR images

Download Link : Download RIOT

Thanks :)