What is jpeg compression ("lossy" compression):
ALL PICTURE ON www.wallpapersultrahd.com
IS IN VERY LOW COMPRESSION 100% Qaulity
All wallpapers is created/rendered in full UHD 8K 7680pix x 4320pix
resolution and no have jpeg compression artefact!
Casual wallpapers websites wallpapersultrahd.com STANDARD
Casual wallpapers websites wallpapersultrahd.com STANDARD
Casual wallpapers websites wallpapersultrahd.com STANDARD
Lossy and lossless jpg compression
It is possible to compress many types of digital
data in a way that reduces the size of a computer file needed to store
it, or the bandwidth needed to transmit it, with no loss of the full
information contained in the original file. A picture, for example, is
converted to a digital file by considering it to be an array of dots and
specifying the color and brightness of each dot. If the picture contains
an area of the same color, it can be compressed without loss by saying
"200 red dots" instead of "red dot, red dot, ...(197 more times)..., red
dot."
The original data contains a certain amount of information, and there is
a lower limit to the size of file that can carry all the information.
Basic information theory says that there is an absolute limit in
reducing the size of this data. When data is compressed, its entropy
increases, and it cannot increase indefinitely. As an intuitive example,
most people know that a compressed ZIP file is smaller than the original
file, but repeatedly compressing the same file will not reduce the size
to nothing. Most compression algorithms can recognize when further
compression would be pointless and would in fact increase the size of
the data.
In many cases, files or data streams contain more information than is
needed for a particular purpose. For example, a picture may have more
detail than the eye can distinguish when reproduced at the largest size
intended; likewise, an audio file does not need a lot of fine detail
during a very loud passage. Developing lossy compression techniques as
closely matched to human perception as possible is a complex task.
Sometimes the ideal is a file that provides exactly the same perception
as the original, with as much digital information as possible removed;
other times, perceptible loss of quality is considered a valid trade-off
for the reduced data.
from: wiki
KW pictures:compresion artifacts