Martin Gainty schrieb:
could you explain just a bit more what is a tile?
If you have a very large image, say 1 million x 1 million pixels or something like that, it is more efficient to split the image into tiles, that is small images of, say, 256 x 256 pixels. If a certain portion of the big image is requested, you can then load these tiles individually from disk and put them together to form the portion of the image that was requested. Tiles which are inside the requested image portion can be used as is, tiles at the borders may not be contained fully in the requested image and must possibly be clipped.
How tiles are used can be seen e.g. in Google Maps: when you have a slow internet connection, while scrolling you can actually see that the map consists of rectangular tiles which are loaded on demand.
This is more or less the same concept as "blocks" when doing paging of virtual memory or "pages" when talking about processor caches. Even Audacity (audio editor) uses this concept to achieve fast editing of very large audio files.
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