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Each matched word was supposed to help Google to build an accurate database used when using the Google Image Search. Without human tagging of images, Google Images search has in the past relied on the filename of the image. For example, a photo that is captioned "Portrait of Bill Gates" might have "Bill Gates" associated as a possible search ...
If there are specific details that need to be seen as described in the text, then a larger resolution can be acceptable. We don't have any exactly numbers, though we often state that the bulk of non-free images can be reduced to between 0.1 and 0.16 megapixels and be considered appropriate.
Images can often be improved – or even transformed – by using graphics software such as Photoshop or the free GIMP and Paint.NET applications. Many other programs also have photo-enhancing tools, including facilities for semi-automatic image enhancement, so that you need only click a button, or choose a thumbnail, to have a positive effect on image quality.
This tag is designed for GPL images licensed by others (usually as part of a software package). Do not use it to tag images you created yourself. Use another free license. {} – GNU General Public License, version 2 only. {} - GNU General Public License, version 3 or later. {} – GNU Lesser General Public License. This tag is designed for ...
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-neighbor interpolation. Other scaling methods below are better at preserving smooth contours in the image.
An extensive list of free image resources by topic can be found at: Public domain image resources. In addition to Wikimedia Commons, the Wikimedia Toolserver has a Free Image Search Tool (FIST), which automatically culls free images from the Wikimedia sister projects, Flickr and a few other sites.
For non-free content, each image page must include: A copyright tag to claim fair use. Wikipedia's file upload function and wizard each help editors choose an appropriate tag. A list is below. Non-free images that meet Wikipedia's policy but do not fit into any of the categories below should use the tag {{Non-free fair use in|Article}}.
Free images should not be watermarked, distorted, have any credits or titles in the image itself or anything else that would hamper their free use, unless, of course, the image is intended to demonstrate watermarking, distortion, titles, etc. and is used in the related article. Exceptions may be made for historic images when the credit or title ...
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