use IMAGE_DATA layer

[Marenkov Dima]

IMAGE_DATA layer can give grayscale image? Ie to the output was one channel, rather than three.

[Traun Leyden]

Yeah it works with grayscale images.

I'd recommend explicitly setting is_color: false as in this example: https://github.com/tleyden/caffe/blob/feature/dev_mnist_data_layer/examples/mnist/lenet_train_test_files.prototxt#L10

Without setting is_color: false on the IMAGE_DATA layer, it seems to create BLOBS with a wrong shape: the blob has 3 channels (RGB) instead of 1 (Greyscale)

Note: the is_color setting will only work on the dev branch at the moment.