Due to a comment by another 365r i read i was introduced to png files. Now i understand that it is an uncompressed file but what i have a question about is when i am saving one of my pictures as a png file a box pops up on the top it reads interlace options and underneath it gives me two choices none / interlaced. What does interlaced mean? and what happens should i choose that options especially in regards to ability to post to websites save on cd's and printed up on a home printer or like if someone wanted to take it to a walmart kiosk.
@cirasj thanks tried to read it but it looks like i will have to try again some other time when my daughter isnt up and i can concentrate on what i am trying to read =D
Interlacing (in this context) essentially means that, on a bad connection, you'd first see a blurry version of the image load, then it'd get sharper. Non-interlaced you'd see the usual slow loading of the image top to bottom. It *might* be the case that interlaced PNGs aren't supported quite as well as non-interlaced ones, but don't quote me. Either option should be safe, although interlacing might make the files marginally bigger.
Interlacing is basically there so that on slower connections your image (albeit in blurry form) will appear more quickly. It works by, instead of storing the pixel data in the file from top left to bottom right, so it'd load sequentially and be drawn in the same manner, it stores the even numbered lines first, then the odd numbered lines, so that as the image data is loaded a rough representation (using the even numbered lines and interpolating the odd) of the entire image can be seen after only half the data's loaded.
That might not be exact, but it's along those lines. If you've ever seen the term 1080i talked about in the realm of HDTV, the "i" there stands for interlaced too, where each frame contains half of its own data and half the next one. In video it's a bad thing, but with images it can be useful.
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Interlacing is basically there so that on slower connections your image (albeit in blurry form) will appear more quickly. It works by, instead of storing the pixel data in the file from top left to bottom right, so it'd load sequentially and be drawn in the same manner, it stores the even numbered lines first, then the odd numbered lines, so that as the image data is loaded a rough representation (using the even numbered lines and interpolating the odd) of the entire image can be seen after only half the data's loaded.
That might not be exact, but it's along those lines. If you've ever seen the term 1080i talked about in the realm of HDTV, the "i" there stands for interlaced too, where each frame contains half of its own data and half the next one. In video it's a bad thing, but with images it can be useful.