CMYK JPEG files sometimes screw up image loaders (e.g. MATLAB imread), and for the ILSVRC CLS-LOC training set, it takes long time to sort out these CMYK files. To this end, we list all known CMYK JPEG files as follows:
n01739381_1309.JPEG
n02077923_14822.JPEG
n02447366_23489.JPEG
n02492035_15739.JPEG
n02747177_10752.JPEG
n03018349_4028.JPEG
n03062245_4620.JPEG
n03347037_9675.JPEG
n03467068_12171.JPEG
n03529860_11437.JPEG
n03544143_17228.JPEG
n03633091_5218.JPEG
n03710637_5125.JPEG
n03961711_5286.JPEG
n04033995_2932.JPEG
n04258138_17003.JPEG
n04264628_27969.JPEG
n04336792_7448.JPEG
n04371774_5854.JPEG
n04596742_4225.JPEG
n07583066_647.JPEG
n13037406_4650.JPEG
Also, n02105855_2933.JPEG is actually a PNG file, which may crash the image loader as well if not configured generic enough.