Interlaced
Interlaced
When you save a photoshop file as a PNG file, it gives you png options, one that says 'none' and the other is 'interlaced'. What does interlaced do? 
I'm just pretty curious.
I'm just pretty curious.If you do not elect to have interlaced then the image will be drawn in a viewers browser from top to bottom, one line at a time - known as progressive.
Choosing Interlaced means that the whole image is displayed from the get-go, starting at low quality and gradually improving as more data is downloaded to the browser, sort of like coming into focus.
Obviously the speed of the host server pushing the data and the bandwidth of the users connection has a direct bearing on the time it takes to render the web page and graphics.
Therefore the option to display the png interlaced or not really depends on the (kb) size of the file and how you would like it rendered to viewers with slower connections.
When deciding, I compare the file size of png graphics with and without the interlace option and make a decission based on the difference in kb.
Choosing Interlaced means that the whole image is displayed from the get-go, starting at low quality and gradually improving as more data is downloaded to the browser, sort of like coming into focus.
Obviously the speed of the host server pushing the data and the bandwidth of the users connection has a direct bearing on the time it takes to render the web page and graphics.
Therefore the option to display the png interlaced or not really depends on the (kb) size of the file and how you would like it rendered to viewers with slower connections.
When deciding, I compare the file size of png graphics with and without the interlace option and make a decission based on the difference in kb.