saving a PNG

[Xelo]

everytime when I save a PNG; ps asks me wether I want to use "Interlace"

V1 - non interlaced:



V2 - interlaced:



rmmm maybe my old eyes (lol), but i don't "see" any difference.
can someone tell me what it means and why i don't see it??

thanx, XL

[Gallagher]

Just from the minimal amount of research I've done, interlace for larger images and not for smaller, I don't know why, I as just told that a while ago. Actually going to research it a bit.

Scratch that, after very little research it seems that interlacing was useful for crappy monitors and horrible connections, but there's really no use for it nowadays.

[Xelo]

Thanx Gallagher !! nothing wrong with my eyes then!!

[Gallagher]

Thanx Gallagher !! nothing wrong with my eyes then!!

Lol, nope, there is nothing wrong with your eyes.

[cc.RadillacVIII]

Hehe yeah the name says it all, Interlace. The image will be composed more carefully and less sloppy to optimize the file to load faster, in short terms.

[Monroe]

Actually interlacing images is still useful, particularly in web design. It saves the data of the image differently, so that the entire shape and size of the image will appear at a low resolution, and then get more clear as it finishes downloading. If you don't interlace the images, then they have to start downloading from the top of the image and it increases to its full size as it finishes downloading. So if you interlace the images of you website say, the layout won't jump around as you wait for the images to download, they'll all appear at their normal size and just get clearer. That's why it makes more sense to use it with larger images because with a smaller image it downloads so quick there's no point, since interlacing an image increases the file size.

[shiv96]

Looks the same to me.

[Xelo]

Actually interlacing images is still useful, particularly in web design. It saves the data of the image differently, so that the entire shape and size of the image will appear at a low resolution, and then get more clear as it finishes downloading. If you don't interlace the images, then they have to start downloading from the top of the image and it increases to its full size as it finishes downloading. So if you interlace the images of you website say, the layout won't jump around as you wait for the images to download, they'll all appear at their normal size and just get clearer. That's why it makes more sense to use it with larger images because with a smaller image it downloads so quick there's no point, since interlacing an image increases the file size.

aha! that makes perfect sense Monroe, thanx. I have indeed seen large pics coming up differently. As for me it doesn't matter witch of the two I use then, since it doesn't effect the quallity of the pic. thanx again.