ILBM
（重定向自.lbm）
ILBM is a subtype of the Interchange File Format (IFF) used for storing picture data. ILBM stands for InterLeaved BitMap which refers to the way the pictures are stored. The image data is stored as a varying number of bitplanes, each storing one bit of data for each pixel in the image. The format supports horizontal and vertical RLE (Run Length Encoding) compression.