To convert the images in tif format, use the method suggested by van Hateren in his notes: convert -size 1536x1024 -depth 16 gray:imk00001.iml imk00001.tif im00010 was first converted as above. The in was auto-leveled and auto-contrasted in photoshop. The the brightness was increased to +148 of baseline. Finally, it was resampled to 300 dpi, 5 inches wide (with a sharpening filter) to obtain the final image. In addition, it was converted from 16 bits to 8 bits per pixel.