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sprite_add(fname,imgnumb,removeback,smooth,xorig,yorig) Adds the image stored in the file fname to the set of sprite resources. Many different image file types can be dealt with. When the image is not a gif image it can be a strip containing a number of subimages for the sprite next to each other. Use imgnumb to indicate their number (1 for a single image). For (animated) gif images, this argument is not used; the number of images in the gif file is used. removeback indicates whether to make all pixels with the background color (left-bottom pixel) transparent. smooth indicates whether to smooth the edges. xorig and yorig indicate the position of the origin in the sprite. The function returns the index of the new sprite that you can then use to draw it or to assign it to the variable sprite_index of an instance. When an error occurs -1 is returned.
sprite_replace(ind,fname,imgnumb,removeback,smooth,xorig,yorig) Same as above but in this case the sprite with index ind is replaced. The function returns whether it is successful.
sprite_add_sprite(fname) Adds the sprite stored the file fname to the set of sprite resources. The file must be a .gmspr file that is saved in the sprite property form in Game Maker. As this file contains all sprite settings, no further arguments are required. The function returns the index of the new sprite that you can then use to draw it or to assign it to the variable sprite_index of an instance. When an error occurs -1 is returned.