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