The Imgview (0.6 Version) is designed for R4 specially, it is a good software in browsing image and cartoon.

Manual:

Use the img2ipk to convert the JPG, PNG, and BMP files to be IPK file(the sample is available in the directory IPK: example.ipk); Copy the IPK file and the "imgview06_R4TF_M3Simply-R4DS (MicroSD Card).nds" to the CF card, run the NDS program on the R4'interface.