Img file extension
The tagged structure was designed to be easily extendible, and many vendors have introduced proprietary special-purpose tags – with the result that no one reader handles every flavor of TIFF file. The TIFF ( Tagged Image File Format) format is a flexible format usually using either the TIFF or TIF filename extension. The actual Exif metadata as such may be carried within different host formats, e.g. When images are viewed or edited by image editing software, all of this image information can be displayed. The metadata are recorded for individual images and include such things as camera settings, time and date, shutter speed, exposure, image size, compression, name of camera, color information. Its purpose is to record and to standardize the exchange of images with image metadata between digital cameras and editing and viewing software.
#Img file extension software
The Exif ( Exchangeable image file format) format is a file standard similar to the JFIF format with TIFF extensions it is incorporated in the JPEG-writing software used in most cameras.
#Img file extension movie
It is not nearly as common as JPEG, but it is used currently in professional movie editing and distribution (some digital cinemas, for example, use JPEG 2000 for individual movie frames). JPEG 2000 also adds features that are missing in JPEG. The compression methods used are different from the ones in standard JFIF/JPEG they improve quality and compression ratios, but also require more computational power to process. JPEG 2000 is a compression standard enabling both lossless and lossy storage. (JPEG also provides lossless image storage, but the lossless version is not widely supported.) When not too great, the compression does not noticeably affect or detract from the image's quality, but JPEG files suffer generational degradation when repeatedly edited and saved. Applications can determine the degree of compression to apply, and the amount of compression affects the visual quality of the result.
JPEG applies lossy compression to images, which can result in a significant reduction of the file size. Nearly every digital camera can save images in the JPEG/JFIF format, which supports eight-bit grayscale images and 24-bit color images (eight bits each for red, green, and blue). The JPEG/JFIF filename extension is JPG or JPEG. JPEG (Joint Photographic Experts Group) is a lossy compression method JPEG-compressed images are usually stored in the JFIF (JPEG File Interchange Format) file format. Most lossy compression algorithms allow for variable compression that trades image quality for file size.įurther information: Raster graphics JPEG/JFIF Often lossy compression is able to achieve smaller file sizes than lossless compression. Lossy compression algorithms preserve a representation of the original uncompressed image that may appear to be a perfect copy, but is not a perfect copy. Lossless compression should be used to avoid accumulating stages of re-compression when editing images. Lossless compression generally, but not always, results in larger files than lossy compression. Lossless compression algorithms reduce file size while preserving a perfect copy of the original uncompressed image. There are two types of image file compression algorithms: lossless and lossy. With vector images the file size increases only with the addition of more vectors. images with large continuous regions like line art or animation sequences) may be losslessly compressed into a GIF or PNG format and result in a smaller file size than a lossy JPEG format.įor example, a 640 × 480 pixel image with 24-bit color would occupy almost a megabyte of space:Ħ40 × 480 × 24 = 7,372,800 bits = 921,600 bytes = 900 KiB For example, graphically simple images (i.e. This characteristic sometimes results in a smaller file size for some lossless formats than lossy formats. With some compression formats, images that are less complex may result in smaller compressed file sizes. Considering exactly the same compression, number of pixels, and color depth for two images, different graphical complexity of the original images may also result in very different file sizes after compression due to the nature of compression algorithms. Images with the same number of pixels and color depth can have very different compressed file size. A compression algorithm stores either an exact representation or an approximation of the original image in a smaller number of bytes that can be expanded back to its uncompressed form with a corresponding decompression algorithm. Images can be compressed in various ways, however. The size of raster image files is positively correlated with the number of pixels in the image and the color depth (bits per pixel). 3.1.14 Container formats of raster graphics editors.