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COMPUTER (DIGITAL) IMAGES
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Image File Formats

.bmp   -   Bitmap
The bitmap format, as used by Microsoft's Windows Paintbrush is the highest resolution available - the color of each individual dot (pixel) is recorded - but consumes a large amount of space which grows rapidly as the image becomes larger as the number of pixels is in proportion to the area, i.e.; the width multiplied by the height (e.g.; width=100, height=100, in 256 colors - number of pixels stored=10,000 (10K); width=200, height=200, in 256 colors - number of pixels stored=40,000 (40K); width=300, height=300, in 256 colors - number of pixels stored=90,000 (90K) ).


.gif   -   Compuserve's Graphical Information Format or 'GIF'
Developed by Compuserve to allow a medium level of compression for the transmittal over images over the internet, the GIF format is restricted to a color depth of from 2 (black & white) to 256 colors.

Both GIF sub-formats are used on this site. Non-Interlaced for the small, 16-color, 'thumbnail' images (designed for compactness and rapid download) where the appearance of the bottom of the image rapidly follows that of the top. Interlaced GIFs for larger images.

GIFs can be either interlaced or non-interlaced. There is little difference in terms of compression between these two sub-formats but a great deal in the way that they are displayed as they are downloaded; the non-interlaced immediately produces the end-quality picture during download but does so in strips from the top of the image to the bottom as the image is loaded. The interlaced sub-format produces an initial, full-sized, image on the screen rapidly by repeating a horizontal line of pixels and quality is increased as detail is filled in on subsequent passes.

Below are two examples of the two sub-formats taken from this site, the first interlaced, the second non-interlaced. Click on either to watch it reload (you will need to be on-line to do this);-

   

TIPS:   Web > Design
The Javascript which follows replaces one image with another;-

<img; name="name" src="filename1" onClick="Javascript:document.name.src='filename2'">


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<a href=BAAAGCLN.php title=" Computer Images ">Computer Images</a>

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