How to write and save image from data?

[sbtunx]

in simple word i want to have an image saved by the program to hard disc that the size is 100x100 pixels the left upper pixel is black and the right lower pixel is white. this is not my problem but as an example will help me to know how use commands to wright an image from data.
thank you for your help.

[bvdet]

This is not exactly what you want, but writes an image to disc that varies from black to white, left to right.

from PIL import Image

im = Image.new("RGB", (255,100))
for x in range(im.size[0]):
    for y in range(im.size[1]):
        im.putpixel((x,y), (x,x,x))
        
im.save("pix.png")

[sbtunx]

thank you bvdet that is helpful for me. also i have question about putpixel command it seams to be slow . how can we use other commands for better response? completing the above code.

[bvdet]

Would im.putdata() work better for you?

from PIL import Image

im = Image.new("RGB", (255,100))
data = [(x,x,x) for y in range(im.size[1]) for x in range(im.size[0])]
im.putdata(data)
im.save("pix.png")