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CSS image replacement is a Web design technique that uses Cascading Style Sheets to replace text on a Web page with an image containing that text. It is intended to keep the page accessible to users of screen readers, text-only web browsers, or other browsers where support for images or style sheets is either disabled or nonexistent, while allowing the image to differ between styles.
Typically they take a web page or image file as an input, and render a colour-blind simulated image as output: Mozilla Firefox color-blind addons; Sim Daltonism simulates color blind vision and displays the results in a floating palette for macOS and iOS. Freeware. Color Oracle downloadable, free color blindness simulator for Windows, Mac and ...
Style may be chosen specifically for a piece of content, see e.g., color; scope of parameters. Alternatively, style is specified for CSS selectors, expressed in terms of elements, classes, and ID's. This is done on various levels: Author style sheets, in this order: Note: See WP:CLASS for a list of all the style sheets loaded.
The draft CSS Color 5 [27] specification introduces syntax for mixing and manipulating existing colors, including: A color-mix() function for mixing colors; Relative color syntax for manipulating components of an existing color; Custom color spaces are also supported via ICC profiles. This allows the use of CMYK on web pages. [27]
: link. image – link from full image to image description page: link. internal – link to file itself (Media:), and links from thumbnail and magnifying glass icon to image description page (note that color and font size specified for a.internal are only applicable in the first case): link. new example ; default: example
The first versions of Mosaic and Netscape Navigator used the X11 colors as the basis for the web colors list, as both were originally X applications. The W3C specifications SVG and CSS level 3 module Color eventually adopted the X11 list with some changes. [7]
The image modification process is sometimes called color transfer or, when grayscale images are involved, brightness transfer function (BTF); it may also be called photometric camera calibration or radiometric camera calibration. The term image color transfer is a bit of a misnomer since most common algorithms transfer both color and shading ...
An image's utility or quality may be improved by cropping (to focus on the relevant portion), cleaning up scanning artifacts, correcting color balance, removing red-eye effect, or other adjustments. The caption of an image should mention such edits (e.g. introduction of false color or pseudocolor ) if a reader needs to know about them to ...