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Assignment 2 Digital Graphics

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Josh Grewal

on 9 September 2013

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Transcript of Assignment 2 Digital Graphics

Unit 30 Digital Graphics- How Different Types of Graphic Images Relate to File Formats
File Sizes
File Sizes can vary depending on the type of file it is. Images can take up a considerable amount of storage on your computer especially Bitmap images. This type of file format is considered one of the best for producing a high quality images but when comes to the file size of these type of images use quite a lot of storage space. Vector Images are also commonly and often a favourable option for graphic designers due to the small amount of storage they use on a system. Vector Images are also known for the high quality designs they produce.
JPEG is an abbreviation for Joint Photographic Experts Group. The average file size of JPEG image is 440KB+ JPEG is a very well known image format. The format of JPEG image is 24 Bit. JPEG is not the best format when it comes to producing graphics images as the bigger you make a JPEG image the poorer the quality of the image as it starts to pixelate. Another drawback of JPEG images are they do not produce high quality printouts. JPEG images often work best when used for image scanning, textures in an image and gradient colour transition images.
GIF is an abbreviation for Graphics Interchange Format. The file format of a GIF image is limited to a value of 256 colours. GIF images work well with graphics that use a small amount of colours. GIF format also supports animated graphic images. In contrast JPEG, GIF images are more effective for scanned images for example drawing instead of colour photographs.
PNG stands for Portable Network Graphics. A PNG format ranges it can either be an 8 Bit or 32 Bit. Works when with images which contains elements of transparency. PNG is considered as one of the best file formats for Bitmap as it produces stronger outputs in comparison to JPEG as the image does not blur or smudge when compressed. PNG was basically an upgrade of the GIF format as GIF images were good for graphics on the web but they are not supported by some web browsers.
Vector Images
A Vector image consists shapes and lines within an image. Vector File Formats use mathematical equations to form an image and unlike bitmap images the quality of an image will always stay at it’s highest quality it does not blur when enlarged. Therefore this is usually the chosen format when designing drawings such as logos. The file size of vector images vary depending on the number of graphic elements the image has.
Compression Techniques
File Compression is technique often used when files are too big to import or upload on a website. This technique reduces the amount of the original file size. File compression is a popular method used when attaching files to an email as the smaller the file the faster the email sent is received. Graphic Images can take up a considerable amount of storage space on the hard drive therefore would sometimes need to be compressed to fit on the hard drive. Photoshop has various options on each format for compressing files such as maximum, high, medium, low as well as lossy and lossless compression.
File Management
File Management is all about the way files on a computer system are organised. File Management is essential making it easier to locate files on a computer. An important factor consider is your file structure ensuring that it easy to locate certain files within your user area.
Naming, Copying and Deleting Files
Naming Files is an essential technique to use in order for you to identify your files in your area. Giving Files appropriate names is also important as by just using numbers you're going to find it hard identifying files and it can be time wasting. So make sure you name your file something that is relevant to the topic your file is about. For example if you were working on a project which was about Digital Graphics then ensure that the file is named Digital Graphics to avoid confusion. Copying Files is also considered to be a good idea because if something happens to your original document at least you have a back up copy of the file. Deleting Files is also important especially files which are outdated and no longer of use to you this will allow more storage space on the system for saving new files.
File Structure
This is also a very common method used when it comes to organising your files. This is a very efficient and useful way of managing your files. There are various that files on the system can be organised such as alphabetically, by date or by type of files. Creating Folders is also a good way of organising files so creating a folder relating to your topics of work that you have on the system.
File Conversion
There are many reasons why people would want to convert a file e.g. you may be trying to import a picture into a software but the file type is not accepted for example in Microsoft PowerPoint AVI files cannot be imported. Another problem may be the amount of storage that file takes up therefore the file size may need reducing by converting the file into a different format. Converting a file is very simple process to carry out. Adobe Photoshop also offers a range of different image formats to convert to. There are many ways this can be done the most common way is by selecting file, save as and then selected the format you want to save the file in or you can export the file to a different format. Online Conversion is an alternative for converting images although this can take time to covert the files and is considered not the most ideal way of converting a file.
It is essential that all files are appropriately named to maintain a good file structure. In this example each of my folders is named my unit name making it easier for me to locate work.
A vector image produces a much stronger output when compared to bitmap. As shown below
Organising Files by type and by name is possibly the most easiest way to find each of your files and it is a file structure that a lot of people often adopt.
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