Duplicate images that are present on your hard drive may have a different format. What to do if the program delete duplicate images, such as presented here Duplicate Image Remover Free, found some similar images in different formats? How to remove duplicate images, leaving those that best meet our needs? To answer these questions, we need to know the characteristics of different image formats. And we start with the most, perhaps, the common image formats - the format JPG.
An important criterion that distinguishes a variety of graphic formats is the presence or absence of compression, that is, the image compression. Obviously, the compressed files are much smaller than uncompressed. Compressed files are also divided into two groups - lossy and lossless compression. Lossless compression involves the preservation of all image data, which undoubtedly affects the size of the file after compression. Such files are slightly larger than lossy compression. Lossy compression is to receive a file is much smaller, but this is due to the removal of the information about the image file, and accordingly, due to deterioration of the quality of the image after compression.
Few people know that the name of the format JPEG - an abbreviation of the name of the development team, who were engaged in the creation of this format - Joint Photographic Expert Group. This is perhaps the most well-known graphic format that has a lot of advantages. It opens almost any program designed for working with graphics and is supported by all browsers. It is also a standard format for storing pictures in modern cameras. JPEG files are small, while maintaining a sufficiently high image quality. When creating a JPEG file using a lossy compression, the compression ratio can be varied and controlled by the user. File compression is done using a method that preserves the most important details of the image and remove details of the least important for visual perception. A significant factor in this method is considered to be the brightness of the object. Selection of this criterion is based on the fact that the human eye perceives a difference in better brightness than the difference in color, so the degree of compression depends on the image content. Thus melkodetalnye difficult to compress images, unlike the images with a small number of parts and smooth transitions that are very well compressed.
When working with JPEG files should be remembered that it is - a lossy format, that is, the format applies to this irreversible compression. A file saved in JPEG, will never be identical to the original. Each of these files recompression image quality deteriorates irreversibly, so you should not repeatedly resave JPEG files. This format is suitable for storage of different pictures, digital images, scanned documents. This format is ideal for images displayed on the Internet and e-mailed as JPEG files are of good quality, coupled with the small size.