DjVu Solo supports the encoding of the following file formats:
DjVu (*.djvu, *.djv)
BMP (*.bmp)
GIF (*.gif)
IW44 (*.iw44, *.iw4)
JPEG (*.jpeg, *.jpg)
PNM (*.pnm, *.ppm, *.pgm, *.pbm)
TIFF (*.tiff, *.tif)
PICT (*.pict, *.pct)
For information about the encoding process, see Opening and encoding an image file.