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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.
JPEG has become standard. However it is a lossy format, you should always keep a master file in a lossless format. Reduction of quality to 85, 80, even 70 does not bug most images too much. However some can become quite ugly, and require high quality. PNG requires more storage space.
Any or none of these options may be specified to control the size of the image. In the case of images with captions, if the image is already smaller than the requested size, then the image retains its original size (it is not enlarged). In the case of images without captions, the image will be enlarged or reduced to match the requested size.
Since the MediaWiki software dynamically scales inline images, there is no technical reason to reduce file size via scaling or quality reduction when uploading images, although non-free images may require scaling due to copyright concerns (see the non-free image resolution guidelines for further information). Also, compressing PNGs may be ...
This image shows the results of overlaying each of the above transparent PNG images on a background color of #6080A0. Note the gray fringes on the letters of the middle image. This shows how the above images would look when, for example, editing them. The grey and white check pattern would be converted into transparency.
The term applies to digital images, film images, and other types of images. "Higher resolution" means more image detail. Image resolution can be measured in various ways. Resolution quantifies how close lines can be to each other and still be visibly resolved. Resolution units can be tied to physical sizes (e.g. lines per mm, lines per inch ...