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What are they made from?
Bitmap images are made up of pixels. Each pixel contains information about its colour, opacity and its position within the image.

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find example of drawing packages
-Adobe Photoshop professional ,paint , gimp,Adobe Fireworks
-Bitmap graphics software applications are known by several names such as raster graphics editors,image editors and paint packages.

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Bitmaps are suitable for making realistic graphics or images and photographs. Bitmaps are the most common type of graphics used and they are supported on digital systems.

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Do Bitmap Graphics have Separate Outline and Fill?

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Do Bitmap Graphics have Separate Outline and Fill?

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No.

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Individual elements cannot be grouped.

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.... they scale well when downsizing  , pixelation

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What are they made from?
Vector files are constructed using mathematical formulas and equations. This contains information about the lines and fills involved, as well as any other effects which may be applied.

What are they suitable for?
Vector files are suitable for company logos, as they can be easily scaled up or down. This means they can be used on small prints such as a business card, as well as on larger surfaces like a van, without any reduction in quality.

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a vector graphic with a small file size is often said to lack detail compared with a real world photo.

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Do Vector Graphics have Separate Outline and Fill?

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Do Vector Graphics have Separate Outline and Fill?

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Yes.

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Vectors can be grouped in threes.

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This is a data compression algorithm which allows the original data to be perfectly reconstructed from the compressed data. The most common use of lossless compression is in the ZIP file format. It is used in cases where it is important that the compressed file is identical to the original file when uncompressed and viewed. Because of this, lossless compression tends to produce larger file sizes than lossy compression (a lossy compressed file may still be about 1/10th the size of a lossless compressed file).

"Lossless compression basically rewrites the data of the original file in a more efficient way"

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Data compression, the process of encoding digital information using fewer bits

Data file compression software
WinRAR, 7-Zip, Disk compression , applications like this are used to make your image file easier to move around (download and extract) this will save you time  because the process will reduces the overall size of your file but if your sending it to a friend they mite not be able to open/extract because they may not have the appropriate software program to uncompressed the data

you mite want to be careful because you can easily find hidden viruses,  Trojans and spyware

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This is a method that uses inexact approximations and partial data discarding. This is done to reduce file size by removing data permanently from the original file, however it reduces quality of the image. It is mostly associated with image file like JPEGs, but could also be for audio files such as MP3s or AAC files. In an image file, the lossyness will show up as pixelated areas and in audio files it would show as a watery sound or reduce the dynamic range of audio. A JPEG image could reduce an image's file size by more than 80%, with barely a noticeable effect, and a compressed MP3 file could be made to one tenth of the original and nearly sound identical. Lossy is irreversible.

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Compression is required in order to make files smaller. This can be for a number of reasons, e.g. if you are trying the email a file to somebody as an attachment, or if you want to save space on a storage device.