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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.
An image size can be changed in several ways. Consider resizing a 160x160 pixel photo to the following 40x40 pixel thumbnail and then scaling the thumbnail to a 160x160 pixel image. Also consider doubling the size of the following image containing text.
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 ...
Do not explicitly define the size of an image in pixels unless there is a good reason to do so. Preferably the size should be specified as a value relative to the user's preferred thumbnail width, using the |upright=scaling factor parameter rather than pixel values, whenever an image is to be displayed at something other than the default width.
Size of this PNG preview of this SVG file: 320 × 120 pixels. Other resolutions: 640 × 240 pixels | 1,024 × 384 pixels | 1,280 × 480 pixels | 2,560 × 960 pixels . Original file (SVG file, nominally 320 × 120 pixels, file size: 4 KB)
Darktable, a raw photo post-processing application GIMP, a feature-rich general-purpose raster graphics editor. A raster graphics editor (also called bitmap graphics editor) is a computer program that allows users to create and edit images interactively on the computer screen and save them in one of many raster graphics file formats (also known as bitmap images) such as JPEG, PNG, and GIF.
An image may also be resampled to change the number of pixels and therefore the size or resolution of the image, but this is quite different from simply setting a new PPI for the file. For vector images , since the file is resolution independent, there is no need to resample the image before resizing it as it prints equally well at all sizes.
Raster graphic image. In computer graphics, rasterisation (British English) or rasterization (American English) is the task of taking an image described in a vector graphics format (shapes) and converting it into a raster image (a series of pixels, dots or lines, which, when displayed together, create the image which was represented via shapes).
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