When the image resolution on Danbooru differs from the image resolution at the source. The following two tags can be used with this tag. source_smaller: One or both dimensions must be larger than the source. height_source <= height_danbooru and width_source <= width_danbooru source_larger: One or both dimensions must be smaller than the source. height_source >= height_danbooru and width_source >= width_danbooru Neither: One dimension is larger than the source, and the other dimension is smaller than the source.