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2. Guetzli - Wikipedia

   en.wikipedia.org/wiki/Guetzli

   Guetzli supports only the top of JPEG's quality range (quantizer settings 84–100) [7] [8] and supports only sequential (non-"progressive") encoding. Guetzli is more effective with bigger files. [8] Google says it is a demonstration of the potential of psychovisual optimizations, intended to motivate further research into future JPEG encoders. [2]

3. Image conversion - Wikipedia

   en.wikipedia.org/wiki/Image_conversion

   Data in a RAW-file is structured according to the Bayer filter's pattern in cameras that use a single image sensor. Debayering, the process of obtaining bitmap data from a RAW-image is always a lossy operation. [citation needed] In addition, some downsampling is always performed, again reducing image information.

4. ExifTool - Wikipedia

   en.wikipedia.org/wiki/ExifTool

   ExifTool is a free and open-source software program for reading, writing, and manipulating image, audio, video, and PDF metadata.As such, ExifTool classes as a tag editor.It is platform independent, available as both a Perl library (Image::ExifTool) and a command-line application.

5. List of archive formats - Wikipedia

   en.wikipedia.org/wiki/List_of_archive_formats

   The replacement for the .sit format that supports more compression methods, UNIX file permissions, long file names, very large files, more encryption options, data specific compressors (JPEG, Zip, PDF, 24-bit image, MP3). The free StuffIt Expander is available for Windows and OS X. .sqx SQX: Windows: Windows: Yes A royalty-free compressing format

6. DjVu - Wikipedia

   en.wikipedia.org/wiki/DjVu

   DjVu has been promoted as providing smaller files than PDF for most scanned documents. [3] The DjVu developers report that color magazine pages compress to 40–70 kB, black-and-white technical papers compress to 15–40 kB, and ancient manuscripts compress to around 100 kB; a satisfactory JPEG image typically requires 500 kB. [4]

7. XnView - Wikipedia

   en.wikipedia.org/wiki/XnView

   It also supports file comments (4DOS descript.ion). XnView can search files that have the same filename or data, and can search for similar graphics as well. The display of the histogram of a picture is possible. Scripts can be created to convert, manipulate and rename a batch of images in one go.