Images on the computer are in the form of digital files, the format of which depends on the type and purpose of the graphics.
Conditionally, all these formats are divided into two large groups - to display pictures on the monitor screen and for printing.
Png - graphic format for the Internet
Of all the currently used graphic formatsFor web images, three - gif, jpeg and a young but very promising png format are most often used. Developed in 1995, as an alternative to not satisfying all user requests for GIF, it is designed for images that are intended to be used on the Internet. Unlike gif, the png format supports 24-bit images and background transparency without cogged edges.
The main advantages of the png format are supportAny colors, work with transparent pixels, an efficient compression algorithm without loss of image quality. Unlike gif, which supports only full transparency, png also preserves semi-transparent pixels (1-99%) due to Alpha channel with 256 grayscale. Built-in gamma correction allows you to display colors without distortion on any computer, regardless of the platform. This format is able to boot with interlaced scanning, and double - horizontally and vertically.
The png format supports RGB color models,Grayskale, Indexed Color and Bitmap without alpha channels. It is not intended for use with professional graphics and does not provide CMYK color support.
How to view a file with the png extension
The easiest way to open such a file is twoClick on it with the left mouse button. Even if no additional programs are installed on your computer, the "Windows Photo Viewer" will start and the picture will be opened. In addition, this format opens without problems the Paint graphics editor (in which you can also edit the image, as well as create a new one) and the Internet Explorer browser included in the standard software package.
For a more comfortable work with images, betterTo install on the computer special programs designed for their sorting, viewing and processing. The png format is a graphic file, so any of these programs can easily work with it. There are many free applications, the functionality of which is quite sufficient to solve most emerging problems.
If the system can not open the file with the png extension, you must reinstall the standard applications and check the windows registry for errors.
Programs for viewing and editing images
Picasa - the program is designed for viewing andEditing images. Has built-in filters, which will help quickly and accurately process the image. In addition, in Picasa, you can create a presentation from the pictures, picking up transitions and overlaying the sound.
FastStone Image Viewer is a convenient application forHome use. Includes all the basic functions of image processing. The main advantage of this program is viewing an image that is open on the whole screen with the increase of individual details. This will allow to consider in detail any area. A slideshow made with FastStone will have an exe extension, so it's easy to launch even on the oldest computer.
XnView is a very functional program withFriendly interface. You can not only see the photos, but also edit them. Such frequently used operations as photo rotation, color alignment or red eye removal are available immediately in the preview window. In addition, in this program, you can create a blur effect or improve clarity. XnView has many useful options. For example, searching for the same files, group processing, and creating a slideshow.
Ashampoo Photo Commander FREE - high-qualityA utility for viewing and processing graphics. Has built-in effects such as sepia, shadow and sharpness, allows you to crop and rotate the image. In addition to basic functions, it has the ability to take pictures of the desktop, record photos on a CD or DVD, convert images and send them to an email address. In addition, it can create panoramas and collages.
In addition to image editors and image viewers, files with the png extension open in any modern browser, as well as in Microsoft Office Word.
All considered programs are completely free. There are many other similar applications. Among them you can note, for example, Honeyview, which allows you to view photos directly from the zip, 7z or rar archive without unpacking them. Irfan View is also worth seeing. Its functionality can be significantly increased with the help of plug-ins, the choice of which will depend on the tasks facing a particular user.