LM loefell web design

1.1.1. BMP

BMP or bitmap is a raster format, which is used practically for all possible raster data storage. It is device independent, that is, it determines the pixel’s colour without reference to the display device and enables you to record images with varying quality levels (to the point of 32 bits).The main advantage of this format is its usability and wide

software support. The compression algorithm used in BMP, can be one of the RLE run-length encoding variants. However, most files do not use compression.

1.1.2. JPEG

This format was designed to transfer graphic data and images overdigital networks and was generally used to hold and transfer full colour photorealistic images. Before JPEG, there were very few formats,which supported 24-bit halftone images. TIFF and BMP formats allowed holding 24-bit data, but they failed to perform losslesscompression of the data, which contained 1000 colours from the real world, on the high quality level.JPEG compresses photos, though with quality loss. Photos and multi-colour images, transferred in this format, are ideal for networking. It is not possible to refine JPEG images, though it is possible to debase them by decreasing the file size. This format is primarily used to hold photorealistic graphic images with a large number of colours. Compressed data capacity

depends on image contents.JPEG supports Progressive JPEG standard, which conceptually looks like interlaced in the GIF format. This means that the JPEG Progressive format images are loaded by parts, which are displayed,

as they are loaded. Such a format is good for large files.

1.1.3. GIF

The GIF file format is used to hold and transfer images in the index colour mode. This format also supports a lossless LZW compression algorithm (a single file may contain a set of images) and interlaced mode. It supports an additional channel to perform a transparency effect, and to hold a set of images that form the frames of an animation. Files in this format have a set of compression algorithm features that allow compressing images with sequential horizontal

colours. This means that a file which contains horizontal bars, will take lesser space than the same file with vertical bars.GIF, unlike JPEG, uses a lossless compression algorithm. It also uses a patented compression /decompression algorithm, which is called LZW (Lempel Zev Welch). The interlaced mode enables it to refine images, while they are loaded. It is very convenient for large files, as you can see the main image features in several seconds after loading.

1.1.4. PCX

PCX format is one of the most usable graphic formats. Originally, it was designed by Zsoft for PC Paintbrush MS-DOS. Hence, it is also known as PC Paintbrush format. Zsoft signed a deal with Microsoft, and as a result, the latter was entitled to use PCX format with other products, including Microsoft Paintbrush for Windows (Microsoft Paintbrush program is delivered with each copy of MS Windows). PCX files are used for graphic data storage and exchange in desktop publishing systems. Image data is encoded with the help of one of the RLE algorithm variants.

1.1.5. TIFF

This format was generally used to hold scanned white and black images. It got prevalence for its support of incompact colour RGBimages. Later revisions made possible to hold palette colour images and support LZW compression algorithm. Still later versions of the TIFF format supported CMYK and YCbCr colour images

and JPEG compression algorithm.Currently, the TIFF format is a rich and flexible file format,supported by many programs. It is capable of recording halftone images with different pixel intensity, and is considered to be a perfect

format for graphic data storage and processing. TIFF is one of the most useful and integrated raster formats. It is easily supported among various platforms and used for different purposes(besides the Internet).

1.1.6. PNG

The PNG file format is a comparatively new progressive format originally designed to replace the out dated GIF. The PNG format has got a new set of features that GIF lacks. PNG also performs lossless compression with the help of a

Deflate algorithm and supports the interlaced mode. The fact,that the format performs a lossless compression, makes it possible to hold photorealistic images. Images don’t lose their quality while compressing and decompressing. The PNG format is specially used for networking.

1.1.7. WMF

You can use WMF files to hold vector and halftone images in the working memory or in disks with post output display. Windows Metafile format is a specific Windows format. It is supported by a lot of “non-Windows” applications for data exchange with Windows applications. Out of Microsoft Windows interface prevalence,WMF format is considered to be a general format for graphic applications and is supported across all platforms.