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RIOT 2024.1.0 – Free Image Optimizer

RIOT 2024.1.0 – Free Image Optimizer

RIOT (Radical Image Optimization Tool) is a free image optimizer that will let you to visually adjust compression parameters while keeping minimum file size. It uses with a side by side (dual view) or single view interface to compare the original with the optimized image in real time and instantly see the resulting file size.

It 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 (JPG, GIF or PNG) for your output file.

Also you can integrate RIOT as plug-in in well known programs like The GIMP, IrfanView and XnView.

Main features of RIOT:

  • open many image types including rare/scientific types
  • save and optimize JPEG, GIF, PNG and Web with a simple, clean user interface
  • automatic optimization selects the most suitable format and parameters
  • 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
  • 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).
  • 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

Input image types

  • common bitmap images as well as Adobe Photoshop PSD files
  • popular HDR formats and RAW camera images
  • rare/scientific types (up to 128 bpp, integer and floating point)

Changes in RIOT 2024.1.0 (2024-01-23):

  • fixed display of batch settings
  • increased UI font size

Changes in RIOT 2023.12.0 (2023-12-25):

  • fixed display of external png optimizer buttons
  • performance and security improvements

Changes in RIOT 2023.9.0 (2023-09-13):

  • fixed update check and made non-blocking again
  • fixed saving of AskToResizeLargeImages from Options
  • fixed hide file type options when changing file type
  • fixed image not resized/changed if resize gives bigger images in kb
  • fixed gimp plugin error when loading v 2023.7

Changes in RIOT 2023.7.0 (2023-08-13):

  • added WebP read/write support
  • new icons for file types
  • improved HiDPI support (improved, but still incomplete)
  • disable incomplete support for animated GIFs that generated confusions
  • fixed improper color reduction on subsequent images after loading an image with less than 256 colors
  • fixed image panel not same size
  • various fixes

Changes in RIOT 1.0.1 (2021-01-28):

  • replaced AVX2 with SSE2 for better compatibility with older CPUs

Changes in RIOT 1.0.0 (2021-01-25):

  • 64 bit version, allowing bigger images to be processed (>50 MP)
  • improved compression with up to 30% for jpeg images
  • decoding support for jpeg images using arithmetic coding
  • improved PE security with DEP and ASLR
  • the AVX2 instruction set for the 64bit version should provide better performance on larger images
  • the 32 bit version is gonna be deprecated (probably the last 32 bit release)
  • fixed display of optiized size in higher text dpi settings
  • using less memory after the image is analyzed
  • other minor fixes & tweaks

Homepage – https://riot-optimizer.com/

Supported Operating Systems: Windows 7, 8, 8.1, 10, 11.

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