Well, I must be stupid. I have 12 .bmp in 16×16 made with a program on ipad (pixaki). I installed ImageMagick-6.9.0-Q16.I copy all the files towards gfw2gf and there I have a folder with a preview and a .bmp.
I copy it all on my SD card, install it in my gameframe and… just 1 fix image. So, if someone could explain it to stupid or clumsy, that would be really nice.
Thanks a lot