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+--- Thread: [split] Python Pillow - Photo Manipulation (/thread-13368.html)
[split] Python Pillow - Photo Manipulation - keegan_010 - Oct-11-2018
Hi,
I am trying to use pillow for an online python photo manipulation course, I am only starting at the basics one of my tasks is to write a program converts an image to a sepia filter. It says that I have to convert it to grayscale and then add some adjustments. I have written some code, I have tried it on 2 images it gave me, however on only one certain image it gave me an error. My code is:
from PIL import Image
file = input("File name: ")
img = Image.open(file)
red,green,blue = img.split()
for y in range(img.height):
for x in range(img.width):
r = red.getpixel((x,y))
g = green.getpixel((x,y))
b = blue.getpixel((x,y))
total = (r+g+b)
avg = int((total/3))
red.putpixel((x,y),avg+30)
green.putpixel((x,y),avg+10)
blue.putpixel((x,y),avg-10)
new_image = Image.merge('RGB', (red, green, blue))
new_image.save("output.png")When I try to do that certain image it says:Error:Traceback (most recent call last):
File "program.py", line 5, in <module>
red,green,blue = img.split()
ValueError: too many values to unpack (expected 3)Thanks for your time.
[split] Python Pillow - Photo Manipulation - Larz60+ - Oct-11-2018
this operation splits an image into four values, see: https://pillow.readthedocs.io/en/3.1.x/releasenotes/3.1.2.html?highlight=split
There is also the following warning:
Quote:If this buffer is smaller than expected, the jpeg2k unpacker functions will write outside the allocation and onto the heap, corrupting memory.