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2. Image compression - Wikipedia

   en.wikipedia.org/wiki/Image_compression

   Image compression is a data compression technique for digital images, to reduce their cost for storage or transmission. Learn about lossy and lossless compression, methods such as DCT, color quantization, and scalability, and history of image compression standards.

3. JPEG - Wikipedia

   en.wikipedia.org/wiki/JPEG

   JPEG is a widely used method of lossy compression for digital images, especially for photos. It can adjust the tradeoff between storage size and image quality, and supports various file formats with .jpg extension.

4. Image file format - Wikipedia

   en.wikipedia.org/wiki/Image_file_format

   Learn about different types of image file formats, such as JPEG, PNG, GIF, and how they are compressed, stored, and used. Compare raster and vector formats, and see examples of common graphic file formats.

5. JPEGmini - Wikipedia

   en.wikipedia.org/wiki/JPEGmini

   JPEGmini is a software that reduces the file size of images and videos with limited quality loss. It was developed by Beamr Imaging Ltd, a company that provides media optimization solutions for various platforms and clients.

6. Wikipedia : Featured picture criteria/Image size

   en.wikipedia.org/.../Image_size

   Compression of an image to reduce file size (in Kb) is usually "lossy" and is not advised for featured pictures. Image compression will reduce download times and save disk space, but it does so at the expense of fine detail and overall image quality. If in doubt, when saving JPEG files, always select the "maximum" quality setting.

7. JPEG 2000 - Wikipedia

   en.wikipedia.org/wiki/JPEG_2000

   JPEG 2000 is a wavelet-based image compression standard that supports scalability, progressive transmission and error resilience. It has a registered MIME type of ...