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2. Template:Non-free reduce - Wikipedia

   en.wikipedia.org/wiki/Template:Non-free_reduce

   This template should be added to the oversized file. Files tagged with this template are placed in the Category:Wikipedia non-free file size reduction requests.Once an oversized file has been replaced by a reduced version, it should be tagged with {{subst:orphaned non-free revisions}}.

3. Image compression - Wikipedia

   en.wikipedia.org/wiki/Image_compression

   Image compression is a type of data compression applied to digital images, to reduce their cost for storage or transmission. Algorithms may take advantage of visual perception and the statistical properties of image data to provide superior results compared with generic data compression methods which are used for other digital data.

4. Image file format - Wikipedia

   en.wikipedia.org/wiki/Image_file_format

   The JPEG filename extension is JPG or JPEG. Nearly every digital camera can save images in the JPEG format, which supports eight-bit grayscale images and 24-bit color images (eight bits each for red, green, and blue). JPEG applies lossy compression to images, which can result in a significant reduction of the file size.

5. Quantization (image processing) - Wikipedia

   en.wikipedia.org/wiki/Quantization_(image...

   This technique is commonly used for simplifying images, reducing storage requirements, and facilitating processing operations. In grayscale quantization, an image with N intensity levels is converted into an image with a reduced number of levels, typically L levels, where L<N. The process involves mapping each pixel's original intensity value ...

6. Template:Non-free manual reduce - Wikipedia

   en.wikipedia.org/.../Template:Non-free_manual_reduce

   This template should be added to the oversized file when manual reduction is requested. Files tagged with this template are placed in the Category:Wikipedia non-free file size reduction requests for manual processing.

7. Lossy compression - Wikipedia

   en.wikipedia.org/wiki/Lossy_compression

   Composite image showing JPG and PNG image compression. Left side of the image is from a low-quality JPEG image, showing lossy artefacts; the right side is from a PNG image. In information technology , lossy compression or irreversible compression is the class of data compression methods that uses inexact approximations and partial data ...