The ICO file format is an image file format for computer icons in Microsoft Windows. ICO files contain one or more small images at multiple sizes and color depths, such that they may be scaled appropriately. In Windows, all executables that display an icon to the user, on the desktop, in the Start Menu, or in Windows Explorer, must carry the icon in ICO format. Icons introduced in Windows 1.0 were 32×32 pixels in size and were monochrome. Support for 16 colours was introduced in Windows 3.0, while Windows 95 introduced 24-bit RGB colorspace and several larger dimensions (64x64, 128x128, etc.)
In computing, JPEG (seen most often with the .jpg or.jpeg filename extension) is a commonly used method of lossy compressionfor digital images, particularly for those images produced by digital photography. The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and image quality. JPEG typically achieves 10:1 compression with little perceptible loss in image quality. JPEG compression is used in a number of image file formats. JPEG/Exif is the most common image format used by digital cameras and other photographic image capture devices; along with JPEG/JFIF, it is the most common format for storing and transmitting photographic images on the World Wide Web.