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2. Wikipedia : Featured picture criteria/Image size

   en.wikipedia.org/.../Image_size

   Under the image there should be a set of numbers in the form "NNNNxMMMM." This is the size of the image in pixels. If these numbers do not appear, then the image is smaller than the limit you specified for display in the "Files" pane in your preferences. If you did not adjust that limit, the default size is 800x600 pixels.

3. File:Example.jpg - Wikipedia

   en.wikipedia.org/wiki/File:Example.jpg

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Special pages

4. Image scaling - Wikipedia

   en.wikipedia.org/wiki/Image_scaling

   In the case of decreasing the pixel number (scaling down), this usually results in a visible quality loss. From the standpoint of digital signal processing, the scaling of raster graphics is a two-dimensional example of sample-rate conversion, the conversion of a discrete signal from a sampling rate (in this case, the local sampling rate) to ...

5. Category : Wikipedia non-free file size reduction requests

   en.wikipedia.org/wiki/Category:Wikipedia_non...

   DatBot goes through daily and resizes bitmap images (jpg, png) to (height*width)<100,000 pixels. Other files (tif, pdf, plus sound and video files) will be located in Category:Wikipedia non-free file size reduction requests for manual processing and svg in Category:Wikipedia non-free SVG file size reduction requests.

6. Image conversion - Wikipedia

   en.wikipedia.org/wiki/Image_conversion

   Like any resampling operation, changing image size and bit depth are lossy in all cases of downsampling, such as 30-bit to 24-bit or 24-bit to 8-bit palette-based images. While increasing bit depth is usually lossless, increasing image size can introduce aliasing or other undesired artifacts.

7. Data compression - Wikipedia

   en.wikipedia.org/wiki/Data_compression

   DCT is the basis for JPEG, a lossy compression format which was introduced by the Joint Photographic Experts Group (JPEG) in 1992. [35] JPEG greatly reduces the amount of data required to represent an image at the cost of a relatively small reduction in image quality and has become the most widely used image file format .