1. Fun gym
Cambridge Nationals R001

2. Compression & File Types
Compression is used to reduce file sizes and change various attributes of an image file.
These attributes include:
File Type
Resolution
Dimensions
Bit depth

3. Types of compression - Lossy
Data is removed during compression before transmission. When the file is received by the recipient it does not revert to its original state.
Data loss is permanent
This is usually not enough to be noticed
This is mainly used for images, video and sound files.
Q: Why is this?
Q: If the file is sent on again and again how will this impact the file quality?

4. Types of compression - Lossless
Data is removed during compression before transmission. When the file is received by the recipient it does revert to its original state.
Data loss is not permanent
This is important for file types which can not loose any of its data e.g. a text document.
Q: Why would lossy not be suitable for a text document?

5. Compression images
Click Here

6. Question
1) Describe the difference between Lossy and Lossless compression. Giving an example where each would be used. [4]
2) Bridget intends to upload photographs to the ‘news’ section of the website. What might be the best file type and why? [4]

7. File Types – Internet standards
What are these common file extensions used for?
.mpeg .jpg .pdf .doc .mp3
.mp4 .wmv .avi .ppt .xls
.gif .exe .rtf .bmp

8. optimising
Why do it?
Optimising your images will reduce your website’s page loading times, reduce bandwidth and improve the browsing experience for visitors. Your search engine ranking should also improve due to your pages loading quicker.
Remember that whilst compressing an image will reduce file size, quality can also be notably reduced if you compress an image too much. It is therefore important to get the balance between image quality and image file size right.

9. Optimising Use specific optimising software. RIOT GIMP
Photo editing software allows you to optimise images to upload to the internet. ‘SAVE AND OPTIMISE FOR WEB’
File Format
Crop
Thumbnail views
FOR MORE INFO CLICK HERE

10. Questions
1) State two file types suitable for images to be uploaded to FUN GYMS website [2]
2) Bridget shoots her photos with a DSLR and uses the SD Card to transfer the photographs onto her computer.
State one type of software that is most suitable for editing images.[1]
3) With the amount of photos Briget would like to upload to the companies website what are the steps she could take to ensure the customers experience wasn’t slowed down or delayed? [5]