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File Formats and File Management

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Robbie Coogan

on 10 December 2013

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Transcript of File Formats and File Management

File Formats and File Management
Graphics images - Comparison
Graphics images
File handling
File formats
File management
JPEG files have the extension .JPEG, .JPG, or .JPE. it has a lossy compression, but gives low file size. However, because it is a bitmap graphic type, it is commonly used to display photos.
Image from http://upload.wikimedia.org/wikipedia/commons/e/e9/Felis_silvestris_silvestris_small_gradual_decrease_of_quality.png
A bitmap is a file type with the extension .BMP and is used for most high quality images.
Bitmap files have color range of 256 trillion colors.
because of the high color range and high resolution capability, bitmap files are usually large in size
There are lossy and lossless types of compression.
lossy compression lowers the file size of the image but loses quality that is noticeable to the person viewing the image.
lossless compression attempts to lower the file size but still keep the image quality so that the person viewing the image does not see any difference from the original
Compression Techniques
Folder structures
-files can be named and renamed to help keep them organised.
-files can also be moved around. this allows for people to keep files in areas that they want.
-files can be deleted as well. this helps organise files by keeping areas 'clean' of files.
Naming, moving, and deleting files
files can be converted into another filetype.
this can be done for compatibility or instead of compression.
Converting Files
Files can have different sizes. file sizes are important because the user's storage device has a limited amount of storage space.
file sizes are bigger or smaller depending on the contents on the file.
File Sizes
Files have different types of format.
the file format is how the file is coded. the file format can usually have compatibility issues with certain programs.
File Formats
This is a map of bits that forms an image and looks normal from a normal perspective, but when zoomed into, it is easy to see the individual pixels it is formed of.
Vector graphics are graphics that are scalable.
these types of graphics dont show individual pixels when zoomed into. this is because it uses mathematical values for the images it creates.
it cannot display real life images though, because of how images are rendered
Vector graphics
File size
Each file has an individual size that it takes up on the user's storage device.
this is important because the storage device has limited space.
Graphics images can be scaled without losing quality.
this is becasue they store the image data using mathematical values.
Each file has its own format (.txt, .bmp, .gif).
the file can have compatibilitiy issues depending on the format of the file.
File format
image from: https://lh5.ggpht.com/y5ARYH-11B6gyG9B4V_XvRjR09Psy385VzUheUDw-I6EffnYGl0AOsFTiXznlzVDyw=w300
image from: http://main.makeuseoflimited.netdna-cdn.com/wp-content/uploads/2012/12/winzipthumb1.jpg
Bitmap - a bitmap image is typically used for images taken from cameras (because vector images can't represent things like that)

Vector - a vector image is typically used for things like website banners and logos because they dont lose quality when scaled.
Typical Uses
This is keeping folders organised. this can be making sure any unused or unwanted files/folders are deleted as well as folders are in the correct location on a computer.
image from: http://fc02.deviantart.net/fs5/i/2005/121/1/8/C_West_Skyline___Vector_by_dangeruss.jpg
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