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It is most useful with a transparent background, e.g. svg or png. Its height is set to determine its scale. By default its top-left corner is aligned with the top-left corner of the frame. It can be shifted right and down relative to the frame to position it over part of the background image. It may have its own alt text set.
Some image formats, such as PNG and TIFF, also allow partial transparency through an alpha channel, which solves the edge limitation problem. Instead of each pixel either being transparent or not transparent, it can be set to 254 levels of partially transparent, allowing some of the background image to show through the foreground image.
The default images for this meta-template are in PNG format instead of SVG format. The main reason is that some older web browsers have trouble with the transparent background that MediaWiki renders for SVG images. The PNG images here have hand-optimised transparent background colour so they look good in all browsers.
A color spectrum image with an alpha channel that falls off to zero at its base, where it is blended with the background color.. In computer graphics, alpha compositing or alpha blending is the process of combining one image with a background to create the appearance of partial or full transparency. [1]
The default images for this meta-template are in png format instead of svg format. The main reason is that some older web browsers have trouble with the transparent png images. For those older browsers these png images have been modified so that the color of their default backgrounds match the background color of the template.
When converting an image from the PNG format to GIF, the image quality may suffer due to posterization if the PNG image has more than 256 colors. GIF intrinsically supports animated images. PNG supports animation only via unofficial extensions (see the section on animation, above). PNG images are less widely supported by older browsers.
While the default setting is to show all images except for those in spam emails, turning the setting off can increase the privacy and security of your account by disabling potentially malicious images and content. 1. Click Settings | More Settings. 2. Click Viewing email tab. 3. Scroll down, until you see Show images in messages.
The default images for this meta-template are in png format instead of svg format. The main reason is that some older web browsers have trouble with the transparent background that MediaWiki renders for svg images. The png images here have hand optimised transparent background colour so they look good in all browsers.