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2. Wikipedia : Featured picture criteria/Image size

   en.wikipedia.org/.../Image_size

   The picture this screenshot is taken from is 1194 pixels wide and 1174 pixels tall. Image sizes on Wikipedia can be determined by doing the following: Go to the image page by clicking on the image thumbnail; Under the image there should be a set of numbers in the form "NNNNxMMMM." This is the size of the image in pixels.

3. Image resolution - Wikipedia

   en.wikipedia.org/wiki/Image_resolution

   An image that is 2048 pixels in width and 1536 pixels in height has a total of 2048×1536 = 3,145,728 pixels or 3.1 megapixels. One could refer to it as 2048 by 1536 or a 3.1-megapixel image. The image would be a very low quality image (72ppi) if printed at about 28.5 inches wide, but a very good quality (300ppi) image if printed at about 7 ...

4. Comparison of graphics file formats - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_graphics...

   Format Compression algorithm Raster/ vector Maximum Color depth. Indexed color Trans-parency. Meta-data. Inter-lacing. Multi-page Anima-tion Layers Color manage-ment

5. 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.

6. Exif - Wikipedia

   en.wikipedia.org/wiki/Exif

   Version 2.1 of the specification is dated 12 June 1998. [ citation needed ] JEITA established Exif version 2.2 (a.k.a. " Exif Print "), dated 20 February 2002 and released in April 2002. [ 7 ] Version 2.21 (with Adobe RGB support) is dated 11 July 2003, but was released in September 2003 following the release of DCF 2.0.

7. JPEG File Interchange Format - Wikipedia

   en.wikipedia.org/wiki/JPEG_File_Interchange_Format

   1: Units for the following pixel density fields 00 : No units; width:height pixel aspect ratio = Ydensity:Xdensity; 01 : Pixels per inch (2.54 cm) 02 : Pixels per centimeter; Xdensity: 2: Horizontal pixel density. Must not be zero Ydensity: 2: Vertical pixel density. Must not be zero Xthumbnail: 1: Horizontal pixel count of the following ...