I have a responsive design Sitecore 7 solution, I want to add svg files into Media Library to be processed exactly like jpg,jpeg pictures. When I upload svg files they are processed like media file not like image files.
As I know Sitecore CMS does not support SVG images out of the box. You are right, if you upload a SVG image, Sitecore will not process it as an image, but processes as a common media file. Thumbnails generation also does not work for a SVG image. Please try use the following media type definition for SVG type:
<mediaType name="SVG image" extensions="svg">
<mimeType>image/svg+xml</mimeType>
<forceDownload>false</forceDownload>
<sharedTemplate>system/media/unversioned/image</sharedTemplate>
<versionedTemplate>system/media/versioned/image</versionedTemplate>
<mediaValidator type="Sitecore.Resources.Media.ImageValidator"/>
<thumbnails>
<generator type="Sitecore.Resources.Media.ImageThumbnailGenerator, Sitecore.Kernel">
<extension>png</extension>
</generator>
<width>150</width>
<height>150</height>
<backgroundColor>#FFFFFF</backgroundColor>
</thumbnails>
</mediaType>
Also please register mime types for svg files into configuration files.
<configuration>
<system.webServer>
<staticContent>
<remove fileExtension=".svg" />
<mimeMap fileExtension=".svg" mimeType="image/svg+xml"/>
</staticContent>
</system.webServer>
</configuration>