BLIT LOAD[BMP] [#]b, fname$ [,x] [,y] [,w] [,h]
BLIT LOAD will load a blit buffer from a 24-bit bmp image file. x,y define the start position in the image to start loading and w,h specify the width and height of the area to be loaded.
This command will work on most display panels (not just panels using the ILI9341 controller).
eg, BLIT LOAD #1,"image1", 50,50,100,100 will load an area of 100 pixels square with the top left had corner at 50,50 from the image image1.bmp