python-kerasHow do I use Python and Keras to resize an image?

Using Python and Keras, you can resize an image by using the ImageDataGenerator class. This class allows you to easily preprocess images, including resizing them.

To use this class, first import the ImageDataGenerator class from Keras:

from keras.preprocessing.image import ImageDataGenerator

Then, create an instance of the ImageDataGenerator class, and set the rescale parameter to the desired size:

datagen = ImageDataGenerator(rescale=1./255)

Finally, use the flow_from_directory method to generate batches of images, specifying the directory containing the images and the desired target size:

generator = datagen.flow_from_directory(
    'data/',
    target_size=(224, 224),
    batch_size=32,
    class_mode='categorical')

The above code will resize all images in the data/ directory to a size of (224, 224).

Code explanation

1. from keras.preprocessing.image import ImageDataGenerator: imports the ImageDataGenerator class from Keras
2. datagen = ImageDataGenerator(rescale=1./255): creates an instance of the ImageDataGenerator class, and sets the rescale parameter to the desired size
3. generator = datagen.flow_from_directory('data/', target_size=(224, 224), batch_size=32, class_mode='categorical'): uses the flow_from_directory method to generate batches of images, specifying the directory containing the images and the desired target size

Helpful links

• Keras Image Preprocessing

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