I want to understand how tile's work, and i found an example and a don't understand completely:( and i have 2 questions .
1. Can anyone tell me why in gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1)), it is adding +1, i understand what are drawable->width and gimp_tile_width, and why is multiplying with 2, but i don't know why in +1?
2. if i want to process an image with tile's, the pixel's that are on the border, they are process? if i have for example to process a pixel with his 8 neighbors, what happed with the pixel's from margins ?
Please can you help me, i have a test paper on school and i want to present something new
Thank you very much :)