14. Image putpixel
14.1. Putpixel
Use the
Image.putpixel(xy, value) modifies the pixel at the given position.xy - The pixel coordinate, given as (x, y).
value - The pixel value.
The color is given as a single numerical value for single-band images (e.g L, greyscale), and a tuple for multi-band images (e.g RGB). In addition to this, RGB and RGBA tuples are accepted for P and PA images.
Note that this method is relatively slow. For more extensive changes, use paste() or the ImageDraw module instead.
14.2. Putalpha pixel level
The code below, the image is initally in black and white, 1 mode. It adds a white line down the middle.
The image is then converted to greyscale, mode L.
and across the middle.
Then, it is conveted to mode RGB so that colour pixels can be added.
from PIL import Image
with Image.open("test_images/crosses_bw.png") as im:
print(im.filename, im.format, im.mode, im.size, sep="; ")
width, height = im.size
# add white vert line
# pix_val = 1
x1 = width // 2
y_vals = range(height)
for y in y_vals:
im.putpixel((x1, y), pix_val )
# add gray hor line
im = im.convert(mode='L')
pix_val = 125
x_vals = range(width)
y1 = height // 2
for x in x_vals:
im.putpixel((x, y1), pix_val )
# add xshape for blue color
im = im.convert(mode='RGB')
pix_col = (100, 181, 246)
x_vals = range(width)
y_vals = range(height)
xy_vals = zip(x_vals, y_vals)
for x, y in xy_vals:
im.putpixel((x, y), pix_col )
y_vals = range(height-1, 0, -1)
xy_vals = zip(x_vals, y_vals)
for x, y in xy_vals:
im.putpixel((x, y), pix_col )
# im.show()
im.save("image/Image_putpixel.png")
