Quality Loss of JPG/JPEG Compression

Q

Where in a picture the quality is lost the most when using JPG/JPEG compression?

✍: FYIcenter.com

A

Quality loss happens most near areas with sharp contrasts between adjacent pixels. Areas with smooth variations of tone and color will have the least quality loss.

Because of this fact, JPG/JPEG is best file format for phtographs and paintings and it is the most common file format used by digial cameras.

On the other hand, JPG/JPEG is not well suited for line drawings and other textual or iconic graphics. Such images may be better saved in a lossless format such as GIF or PNG.

The following image shows the quality loss of JPEG compression with a quality setting of 50%. Darker areas represent bigger quality losses. Note that quality losses are concentrated near sharp edges and having a block-like shape.
JPEG Quality Loss at 50%

2013-11-01, ∼3828🔥, 0💬

Spotify & Netflix Apps not working with 8 update
Both Spotify and Netflix downloaded onto my computer. When I updated to 8.1, they stopped working. They open, but they won't play any songs or movies. Method 1: Run app troubleshooter I would suggest you to download and run the Modern UI App troubleshooter from the following link. It would tell us t... 2013-10-30, ∼3979🔥, 0💬

Quality Parameter of Picture JPG/JPEG Files
What is the quality parameter of pictures saved in JPG/JPEG format files? Since JPG algorithm uses a lossy compression algorithm to reduce the file size, a percentage parameter, also called JPG quality, is introduced to control how picture quality should be maintained in the compression process. For... 2013-11-01, ∼3923🔥, 0💬

JPG/JPEG File Format for Pictures
What is JPG/JPEG file format? JPG or JPEG is a short name for Joint Photographic Experts Group, which is a very popular encoding format for storing pictures. JPEG was developed by the Joint Photographic Experts Group committee in 1992, and approved as ISO standard, ISO 10918-1, in 1994. JPG or JPEG ... 2013-10-31, ∼3893🔥, 0💬

Quality Loss of JPG/JPEG Compression
Where in a picture the quality is lost the most when using JPG/JPEG compression? Quality loss happens most near areas with sharp contrasts between adjacent pixels. Areas with smooth variations of tone and color will have the least quality loss. Because of this fact, JPG/JPEG is best file format for ... 2013-11-01, ∼3829🔥, 0💬

Unable to access apps from Start Screen/ Desktop
recently changed my Windows Live password and on the PC Settings tab it askes me to 'trust my PC'. When I click this it tries to connect me to the internet but it wont work as its one of the features I am unable to access! How do I trust my PC? The "Trust my PC" does need access to the internet as i... 2013-10-30, ∼3772🔥, 0💬

Installing and Using jpgQ
How to download and install jpgQ? How to use it to estimate the quality level of JPG/JPEG file? If you are interested in using jpgQ, follw these steps to download and install jpgQ: 1. Go to http://www.mediachance.com/dig icam/jpgq.htm2. Locate and download the jpegq.zip file on the page. The file si... 2013-11-05, ∼3682🔥, 0💬

Pixel Size of Pictures
What is the pixel size of a pictures? Pixel size, sometimes called image size, or picture resolution, of a picture refers to the number of pixels used to represent the picture in both horizontal and vertical dimensions. For example, if a camera says it has a 8M (3264x2448) photo resolution, it means... 2013-10-31, ∼3430🔥, 0💬

Perceptible Quality Loss of JPG/JPEG Compression
At what JPG/JPEG compression level should I see perceptible quality losses? In general, quality levels of 90% or higher are considered "high quality". At 90%, there is very little difference in smooth areas. But edges of objects are not as crisp as the original picture. Quality level of 80% to 90% i... 2013-11-04, ∼3398🔥, 0💬

Picture Quality Level of Samsung SGH-i937
What are JPG/JPEG compression quality levels supported in Samsung SGH-i937 cell phone? Its Photo Quality setting provides 3 options: High, Medium and Low. To figure out the JPG/JPEG compression quality levels corresponding to High, Medium and Low photo quality options in Samsung SGH-i937 cell phone,... 2013-11-06, ∼3326🔥, 0💬

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.