Keras showing images from data generator

Question

I am using image generator for keras like this:

val_generator = datagen.flow_from_directory(
        path+'/valid',
        target_size=(224, 224),
        batch_size=batch_size,)

x,y = val_generator.next()
for i in range(0,1):
    image = x[i]
    plt.imshow(image.transpose(2,1,0))
    plt.show()

This shows wrong colors:

I have two questions.

1. How to fix the problem

2. How to get file names of the files (so that I can read it myself from something like matplotlib)

Edit : this is what my datagen looks like

datagen = ImageDataGenerator(
    rotation_range=3,
#     featurewise_std_normalization=True,
    fill_mode='nearest',
    width_shift_range=0.2,
    height_shift_range=0.2,
    horizontal_flip=True
)

Edit 2 :

After following Marcin's answer :

image = 255 - image

I get normal colors , but there are still some weird colors:

Answer 1

The dtype of your image array is 'float32', just convert it into 'uint8':

plt.imshow(image.astype('uint8'))