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2. File:Type 98 20 mm AA Truck.jpg - Wikipedia

   en.wikipedia.org/.../File:Type_98_20_mm_AA_Truck.jpg

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3. Enlarger - Wikipedia

   en.wikipedia.org/wiki/Enlarger

   The image may be printed to a size different from the negative or transparency. Without an enlarger, only a contact print would be possible, and large images would require large size negatives and hence very large cameras. Local contrast and density of various parts of the print can be easily controlled.

4. 20 mm caliber - Wikipedia

   en.wikipedia.org/wiki/20_mm_caliber

   20 mm caliber is a specific size of popular autocannon ammunition. The dividing line between smaller-caliber weapons, commonly called " guns ", from larger-caliber " cannons " (e.g. machine gun vs. autocannon ), is conventionally taken to be the 20 mm round, the smallest caliber of autocannon.

5. Image scaling - Wikipedia

   en.wikipedia.org/wiki/Image_scaling

   Image scaling can be interpreted as a form of image resampling or image reconstruction from the view of the Nyquist sampling theorem.According to the theorem, downsampling to a smaller image from a higher-resolution original can only be carried out after applying a suitable 2D anti-aliasing filter to prevent aliasing artifacts.

6. 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.

7. Comparison gallery of image scaling algorithms - Wikipedia

   en.wikipedia.org/wiki/Comparison_gallery_of...

   One of the simpler ways of increasing the size, replacing every pixel with a number of pixels of the same color. The resulting image is larger than the original, and preserves all the original detail, but has (possibly undesirable) jaggedness. The diagonal lines of the "W", for example, now show the "stairway" shape characteristic of nearest ...