08-19-2022, 09:10 AM
(08-19-2022, 07:33 AM)rich2005 Wrote: From a video perspective
Progressive or non-interlaced scanning is any method for displaying moving images in which the lines of each frame are drawn in sequence. This is in contrast to the interlacing used in traditional television systems.
Interlace, Interlaced, Interlacing, non-progressive
Each frame of a video picture is scanned twice. Firstly, all the odd lines are broadcast, then all the even lines are broadcast.
Yes, but when it comes with still images, interlaced/progressive means that the file data start with lines 1,5,9,13.... and when the bottom line has been reached, continue with 3, 7, 11,... and then 2, 6, 10... and then 4, 8, 12...
So when you have received 1/4 of the data you have a low-res version (one line out of four) of the complete image, and with half the data, you have a better version of the complete image (one line out of two). So with slow internet, your web pages don't come out with big empty spaces while the images are downloaded.