11.3_Reducing_file_sizes_for_storage_or_for_transmission.pptx

reducing file sizes for storage or for transmission

1. Reducing file sizes for storage or for transmission Subtopic 11.3

2. To achieve faster transmission for electronic files, you can compress the files Compression will lower the number of bytes Compression temporarily alter the structure of the data

3. Lossy compression Works by permanently deleting some of the data in the file It deletes unnecessary data (not detectable by human eye) This technique is usually used with images, audio and graphics. Original file cannot be retained

4. Lossless compression Reduces the file size with no loss of information It works by finding repeated data in a file and only saves the data once. Usually used for documents, text and numerical data Original file is recreated exactly when uncompressed