Screen Savers and Backgrounds

 

Screen savers were of interest in the earliest days of PCs to add some viewing interest when the screen was not busy presenting other things.  It also served to move patterns of graphic images so the phosphors of the monitor’s CRT wouldn’t sustain damage by retaining a burned-in image.  This could occur if the image remained stationary for extended periods.  This kind of damage is less likely now for a few reasons – one of which is that the CRTs are less susceptible to such damage.

 

A typical screen saver used today is more likely to be a succession of photos that fill the screen and cycle to the next photo a few times a minute.  Generally, a screen saver installation makes some use of the folders inherent in an operating system, and will often have an image converter to make a temporary conversion of the format of the images available in a given collection.  A screen saver collection may or may not be encoded in a standard file format, so it is sometimes necessary to convert to a standard image format before it can be presented.  In some cases, the screen saver images will have all of the frames (or photos) embedded in a single file, and the converter must select from individual photos within that file as well as ensure that they are in a format like JPG or BMP before they are presented on the monitor.  The conversion programs that make individual screen saver images appear would usually be found in C:\Windows or in C:\Windows\System, and most often would have an SCR file extension.  Sometimes, a variety of “transitions” are provided to make a smooth transfer of  the view when one photo is replaced by another.

 

A particularly fascinating screen saver was provided in the Microsoft software package called Plus! (the one for Windows 98 only).  It is called Organic Art, and it proceeds with a routine of creating a myriad of intriguing images that are continually growing or changing.  There are more than a dozen forms of image types in the routine which takes about a half hour to complete a cycle.

 

Background images are sometimes referred to as “wallpaper,” since they provide a backdrop for the desktop, which is the array of shortcut icons and start menu items that appear when the computer is first booted or when a user returns to this handy screen.  Background images often are automatically replaced with screen saver images if the computer sees no activity on the part of the user for a prescribed time, often less than 15 minutes.  Some of the backgrounds come with the installation of the operating system and others may be available by custom insertion by a user, or they may be part of the same collection provided by a screen saver, if the background feature of the screen saver is invoked.  Prior to Windows Me, an individual background image would be stored as a BMP file in C:\Windows.  Normally, it would be at least 640 X 480 pixels (a width-to-height ratio of 4 to 3) and with sufficient resolution to look okay if expanded to 800 X 600 pixels.

 

In versions of Windows more recent than Windows 98 SE, indivdual background images would be stored as JPG files in C:\My Documents\My Photos, and would meet similar requirements for width and height.

 

Obtaining Screen Saver photo collections

 

Screen saver software with image collections can be purchased on a CD.  Another popular source for such collections are some that can be downloaded free (or with a nominal charge if you want no restriction on the number of photos downloaded daily, and you want no restriction on copying the higher resolution pictures).  Two sites will be mentioned; www.webshots.com and www.secondnature.com .

 

Copying an image from a screen saver collection

 

Screen saver images often represent quality photos, and a user may wish to extract a photo from the set for another purpose, although this may be in violation of the strict copyright provisions of the originator.

 

Be that as it may, a procedure for making a copy is often available.  For example, most screen saver collections and viewing programs can also be set up to show the images as backgrounds.  With Webshots images, the specific photo being displayed as a background is the temporary file that is found in C:\Windows as Webshots.BMP.  By the use of Windows Explorer, a copy of that temporary file can be established in a more convenient folder on your hard drive.  What remains is for you to give the file a unique name that is descriptive of the image.  You can also make it a smaller file by converting the renamed BMP file to a JPG file.

 

A similar procedure can be used for most photos in other screen saver collections and programs.

 

Impediments when copying a Webshots collection for installation on a second computer

 

It appears that you will often get an error message if you copy a collection (having a WBC file extension) to a disk and then try to copy the disk to a second computer.  If this occurs, you can compress the WBC file by using a utility such as WinZip.  Then the second computer will accept copying the ZIP file to a folder.  After being unzipped, the WBC file can be placed in the Collections folder of the Webshots program folder of the Program Files folder.  It is also possible to extract a WBC file greater than 2 MB on diskettes by using WinZip in the Classic mode and by using its Backup process to span the file across a few diskettes.  Upon transferring the file to a second computer, you do a Restore process, which is the reverse of  Backup.