20 Reason To Travel To Batam Australia Travel Cautionary Measures Bandung Budget Hotel Benefits Of Going In For Indonesian China Now Introduces Touch Screen Different Experiences In Hotel Boeken Discover Exciting Hotel Accommodations Elements Of A Good Everything You Need To Know Executive Protection Denpasar Bali Indonesia Explore The Culture And Festivals Finding Phuket Hotels Forex Rates Are The Prices Of Currency Going To Bali For Traveling Great Escapes From Your Routine History Of Foreign Exchange 5 Events Holidays In Bali The Indonesian Hotel Booking Worldwide Indonesia Pajak Guide Review Indonesia Teak Furniture Craftsmanship Indonesia Wood Furniture Indonesian Coal Seller Indonesian Food most Delicious Option Indonesian Translation And Javanese Translation Introduction To The Shaman Class In Wow Journey To Batam In Indonesia Kintamani Indonesian Restaurant Indonesian Cuisine Leaves Latest Network Marketing Opportunities Sunrise Travel Livestock Exports To Indonesia Magickal Oils of Indonesian Online Forum In Indonesia Resto Shaman Pve Guide Information Review Of Kampung Chat Online Ritmic Traumatic indie Rock Music Band Rokok Kretek The Culture And Heritage Save Indonesia Adsense Publisher Shipibo Ayahuasca Shaman Leoncio Single Travel Asia – Gaining Popularity Stop Corruption And Bribery In Indonesia The Basics Of A Shaman Leveling The Different Shaman Talents The Frightening Political Direction In Indonesia The Worlds Most Amazing Top Honeymoon Toyota Innova Is A Popular Traits To Look Out For In The Indonesian Travelers Guide To Kuta Indonesia Traveling From Bintan To Singapore Understanding The Election In Indonesia Visit Kuta At Bali Buy Handicraft What Are Indonesias Main Tourist Attractions Why Indonesia Serious Mlm Networkers Wildfires A Growing Natural Hazard Wonderful Indonesia Insights Looking At The Shaman Shaman Leveling Wow Indonesia Now In 2nd Position Shaman Guide
7 Creative Ideas for Your Avoiding Pitfalls When Taking High Better Digital Photography Taking Pictures Or Creating Choosing Photos for Your Adoption Profile Choosing Stock Photos For Your Header Collage Picture Frames Being Artistic Collage Picture Frames Understanding the Basics Collage Picture Frames A Unique Collage Picture Frames Create Art Compressed Digital Photo File Formats Storing Digital Photo Frame Mysteries Picture Digital Photo Frames A New Era in Digital Digital Photo Organization Basics Digital Picture Frames A Gift Digital Picture Frames Why You Should Digital Picture Frames Do More with Digital Double Picture Frame Telling Facebook Privacy and Your Photos Frame Your Cherished Memories In Beautiful Goal Setting How to Turn How a Digital Photo Frame Completes Interior Decorating With Picture Frames Make Extra Money Selling Photos Making Picture Frames With DIY Framing Memorable Christmas Pictures With A Digital Photo Gift Range Digital Photo Picking Out a Digital Picture Picture Frame Mats A Simple Way to Improve Picture Search Engines Please Tell Me Portable Digital Photo Display Digital Resize Photos Or Images Its Not Just Share Your Photos In A Unique Sharing Your Photos Using Sorting Photos A Method to Get You Started Sublime Layout with One Picture Take Better Digital Pictures in 3 Easy The History Of Digital Tips on Learning About Digital Top Reasons Why Digital What Are Digital Picture Frames What To Do When What is a Digital Photo What is a Digital Why Digital Picture Frames Why Online Photo Books Are Better Why You Should Get a Digital
Compressed Digital Photo File Formats - Storing Digital Photos
Digital photos are stored as files on memory cards and computer hard disks. They can be stored in different file formats (each format has a unique file extension). Most of the formats are compressed to save space and each has its own pros and cons.
The need for standard file formats
Digital photos are saved as digital files on electronic media. These digital photo files are a collection of bytes. If each manufacturer and camera would have used a proprietary file format then you would have needed proprietary software that could read, print and display those formats. Using a standard format allows any camera to save photos while any other software can read, display and print them.
What is compression and why it is needed
A digital photo is a collection of pixels - each pixel is stored as a value that represents its color and intensity. Usually each pixel is represented by an RGB value (three numbers one byte each with values 0 to 255 representing the intensity of Red, Green and Blue that combined together create the pixel's color). An RGB value occupies 3 bytes. So how big is a digital photo file? It depends on the number of pixels in the photo. For example if you shoot a photo using an 8 mega pixels digital camera the photo will have 8000000 pixels each one occupying 3 bytes. The total file size would be 8000000*3=24000000 or 24Mbytes. This is a very big file. Big files are harder to manipulate they take a long time to send by email, they occupy large storage space and they take longer to load.
In any digital photo there is data that is either redundant or that if removed the viewer would not be able to notice the difference. In addition representing pixels as RGB values is not efficient in terms of storage space. The process of compression takes advantage of these facts. When you compress a digital photo the compression software represents pixels in a more efficient way, removes redundant data and removes data that is "not important". The result is a significantly smaller file. For example the above 24Mbytes file could easily be compressed to about 3Mbytes with hardly any noticeable quality degradation.
Before compressed digital photo files can be viewed or printed they need to be decompressed. Decompression is the reverse process of compression - a compressed file is converted to its original format - usually a simple RGB pixel file. Using standard compression file formats allows one software to compress a digital photo file and another software to decompress it and process it.
Lossy or Lossless compression?
There are two main types of compression software: lossy and lossless. Here are the differences:
Lossless compression: Lossless compression means that if you take a file compress it and then decompress it - the decompressed file would be the exact copy of the original file. With lossless compression no data is lost in the compression process - the compression software uses better representation of the data in the file but it does not remove any data from it.
Lossy compression: Lossy compression means that if you take a file, compress it and then decompress it - the decompressed file would be slightly different than the original one. The compression software not only represents the file's data more efficiently but it also removes data that it considers minor or not important. Such data can be removed without hardly any noticeable degradation in the file quality. The differences between the original file and the decompressed file are minor and should be negligible to the user.
Lossless compression is usually applied to text and other data where all data is equally important. For example when compressing the text in this article and later on decompressing it you would want to get the exact original article without any words or sentences dropped by the compression software that decided they were not important.
Lossy compression is usually applied to digital photos and graphic files. Such files include data that the viewer would not be able to notice if removed. For example small changes to color in a photo might not be noticeable. The decompressed file is not exactly the same as the original one but when viewing both the original and decompressed photos side by side the viewer can not tell the difference. Lossy compression software can be set to different compression levels based on how much data is allowed to be lost. At some point losing too much data is noticeable and degrades the digital photo quality. Many digital cameras allow you to set the level of compression from low to high where high compression means smaller files but less quality and low compression means bigger files but no noticeable quality degradation.
Common digital photo file formats
All rights reserved
Copyright © 2013 Rockebys Custom Picture Frames