Optimize JPG, GIF, PNG, even with preview and resize, using RIOT
RIOT (Radical Image Optimization Tool) is a free program that will help you optimize your JPG, GIF and PNG images even in batch processing, previewing the results. RIOT offers also a plugin for IrfanView.
Features: open multiple formats by looking first at the magic number (it does not need file extension to recognize format) including support for uncommon types (up to 128 BPP, integer and floating point. EX: hdr images, 16 bit grayscale, etc). Adaptive logarithmic tone mapping algorithm (Drago) used for HDR images; save and optimize; works in dual view: (original – optimized image) or single view (optimized image).
Compress files to desired file-size threshold; fast processing (all is done in memory); see resulting file-size; decide if you want to keep metadata (comments, IPTC, Adobe XMP, EXIF profiles, ICC profiles). Unsupported metadata is removed; common tools: pan and zoom, rotate, flip; resize image by using well known resample filters. And more.