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An example of a 1x1 image. 1:1 pixel mapping is a video display technique applicable to devices with native fixed pixels , such as LCD monitors and plasma displays . A monitor that has been set to 1:1 pixel mapping will display an input source without scaling it, such that each pixel received is mapped to a single native pixel on the monitor.
Then the resolution-independent version is rendered as a raster image at the desired resolution. This technique is used by Adobe Illustrator Live Trace, Inkscape, and several recent papers. [6] Scalable Vector Graphics are well suited to simple geometric images, while photographs do not fare well with vectorization due to their complexity.
Compression of an image to reduce file size (in Kb) is usually "lossy" and is not advised for featured pictures. Image compression will reduce download times and save disk space, but it does so at the expense of fine detail and overall image quality. If in doubt, when saving JPEG files, always select the "maximum" quality setting.
When scaling a vector graphic image, the graphic primitives that make up the image can be scaled using geometric transformations with no loss of image quality. When scaling a raster graphics image, a new image with a higher or lower number of pixels must be generated. In the case of decreasing the pixel number (scaling down), this usually ...
In the examples above, the size of the image is scaled based on each user's default image size, which can be changed at Special:Preferences. Setting image size in pixels, such as "250px", would override the user's preference and display the image as 250px wide for all users who view that image on that page.
Images that are not photographs, such as diagrams and screen captures of applications or older video games, use few colors. If it makes sense, save the image in indexed mode. A truecolour PNG can often be converted to indexed mode without changing the look of the image, while saving on file size.
Preserve the original image size, and put a box around the image. Show any caption below the image. Float the image on the right unless overridden with the location attribute. Note: Any size options specified will be ignored and flagged as a 'bogus file option' by the Linter. frameless Automatically scale the image up or down.
To reupload an existing image, for example an infographic based on older data, go to that image file description page and find the link that says "upload a new version of this file", which opens a wizard to upload the new version.