How to use PIL to make all white pixels transparent?

by

You need to make the following changes:

  • append a tuple (255, 255, 255, 0) and not a list [255, 255, 255, 0]
  • use img.putdata(newData)

This is the working code:

from PIL import Image

img = Image.open('img.png')
img = img.convert("RGBA")
datas = img.getdata()

newData = []
for item in datas:
    if item[0] == 255 and item[1] == 255 and item[2] == 255:
        newData.append((255, 255, 255, 0))
    else:
        newData.append(item)

img.putdata(newData)
img.save("img2.png", "PNG")

More Related Contents:

  1. How do I resize an image using PIL and maintain its aspect ratio?
  2. How to convert a PIL Image into a numpy array?
  3. In Python, how do I read the exif data for an image?
  4. How to merge a transparent png image with another image using PIL
  5. How to reduce a jpeg size to a ‘desired size’?
  6. Get pixel’s RGB using PIL
  7. Image library for Python 3
  8. PIL: Convert Bytearray to Image
  9. How do I convert a PIL Image into a NumPy array?
  10. Changing image hue with Python PIL
  11. How to reduce the image file size using PIL
  12. How do you merge images into a canvas using PIL/Pillow?
  13. Getting list of pixel values from PIL
  14. PIL and pygame.image
  15. How do I get the picture size with PIL?
  16. Can you “stream” images to ffmpeg to construct a video, instead of saving them to disk?
  17. How to Split Image Into Multiple Pieces in Python
  18. PIL – draw multiline text on image
  19. How to convert a grayscale image into a list of pixel values?
  20. Convert png to jpeg using Pillow
  21. How to read a raw image using PIL?
  22. How to show PIL images on the screen?
  23. Change EXIF data on JPEG without altering picture
  24. img = Image.open(fp) AttributeError: class Image has no attribute ‘open’
  25. Detecting thresholds in HSV color space (from RGB) using Python / PIL
  26. Colorize image while preserving transparency with PIL?
  27. Add Text on Image using PIL
  28. PIL “IOError: image file truncated” with big images
  29. Automatically cropping an image with python/PIL
  30. How to get alpha value of a PNG image with PIL?

Leave a Comment