PYTHON

python how to get pixel values from image

from PIL import Image

def get_image(image_path):
    image = Image.open(image_path).convert("L")
    pixel_values = list(image.getdata())

    return pixel_values

python how to get pixel values from image

# Third party modules
import numpy
from PIL import Image


def get_image(image_path):
    """Get a numpy array of an image so that one can access values[x][y]."""
    image = Image.open(image_path, "r")
    width, height = image.size
    pixel_values = list(image.getdata())
    if image.mode == "RGB":
        channels = 3
    elif image.mode == "L":
        channels = 1
    else:
        print("Unknown mode: %s" % image.mode)
        return None
    pixel_values = numpy.array(pixel_values).reshape((width, height, channels))
    return pixel_values


image = get_image("gradient.png")

print(image[0])
print(image.shape)

python how to change the image pixel values

from PIL import Image

def change_image_pixel_values(imaged_path,by_value):
    # Import an image from directory:
    input_image = Image.open(imaged_path)
    
    # Extracting pixel map:
    pixel_map = input_image.load()
    
    # Extracting the width and height 
    # of the image:
    width, height = input_image.size
    
    # taking half of the width:
    for i in range(width):
        for j in range(height):
            
            # getting the RGB pixel value.
            red, green, blue, p = input_image.getpixel((i, j))

            red -= by_value
            green -= by_value
            blue -= by_value
            # setting the pixel value.
            pixel_map[i, j] = (red,green,blue)
    
    # Saving the final output
    # as "grayscale.png":
    input_image.save(imaged_path, format="png")