mirror of
https://github.com/TomHodson/tomhodson.github.com.git
synced 2025-06-26 10:01:18 +02:00
37dbad1eed
commit 13bfa6c6f9e911420e83d2e051a2aa95857359d8
Author: Tom <thomas.hodson@ecmwf.int>
Date: Tue Mar 4 18:10:42 2025 +0100
Finish post
commit 5ded765f53b3551ae8ddd466004ca7026c1a90f8
Author: Tom <thomas.hodson@ecmwf.int>
Date: Tue Mar 4 17:41:23 2025 +0100
Writing post
commit 98487c174c8f9150f6e5e33922ee75460b100926
Author: Tom <thomas.hodson@ecmwf.int>
Date: Tue Mar 4 15:08:27 2025 +0000
Quick fix
commit cadc04083d02e4e157f780d8a358e22e0c597b37
Author: Tom <thomas.hodson@ecmwf.int>
Date: Fri Feb 28 10:32:43 2025 +0000
publish ecmwf wms post
commit 05b6311fd6e92e1d8fadd79c5651e06bbf2696c9
Author: Tom <thomas.hodson@ecmwf.int>
Date: Mon Feb 24 16:04:20 2025 +0000
Update feed.xml
commit ac09cc1d39306de6226d66a72fc67c11aba4ad0f
Author: Tom <thomas.hodson@ecmwf.int>
Date: Thu Feb 20 08:54:57 2025 +0000
Make bound states an animation
commit b16485972c81f3f0bd1dd9deda5ea3b114344f25
Author: Tom <thomas.hodson@ecmwf.int>
Date: Sun Feb 16 18:26:20 2025 +0000
Squashed commit of the following:
commit ddd4a9145fb903eba795f3dea9402268a099e651
Author: Tom <thomas.hodson@ecmwf.int>
Date: Sun Feb 16 18:26:06 2025 +0000
Make executable code snippets post
commit 00ff594495a1741d2666703367b10fd82e5c2048
Author: Tom <thomas.hodson@ecmwf.int>
Date: Sun Feb 16 17:36:09 2025 +0000
Update new_post.py
commit ff965f1037e0a94d466dc51f5570f56f26990d2c
Author: Tom <thomas.hodson@ecmwf.int>
Date: Sun Feb 16 17:35:17 2025 +0000
Update new_post.py
commit 5b3c86ee9a95d314286935ddc54ca0a306755280
Author: Tom <thomas.hodson@ecmwf.int>
Date: Sun Feb 16 17:32:29 2025 +0000
Update new_post.py
commit 6f0d2a006abe8b9eea0a82b17425144e91e1965c
Author: Tom <thomas.hodson@ecmwf.int>
Date: Sun Feb 16 17:26:35 2025 +0000
Don't open new posts in the browser just print the url
commit c05b03e8d16929d3a614a841919357c1a9eb427f
Author: Tom <thomas.hodson@ecmwf.int>
Date: Thu Feb 20 08:54:31 2025 +0000
Update 2025-02-16-usb-c-psu-monitor-board-bringup.md
commit 718c56544a5ef3f49bfc86e1adab9fbf467111ff
Author: Tom <thomas.hodson@ecmwf.int>
Date: Sun Feb 16 21:02:35 2025 +0000
Write post
commit 26de5b5515fec3fdb84fd397b34b6027c9dfee44
Author: Tom <thomas.hodson@ecmwf.int>
Date: Sun Feb 16 17:26:14 2025 +0000
Create 2025-02-16-usb-c-psu-monitor-board-bringup.md
39 lines
1.2 KiB
Python
39 lines
1.2 KiB
Python
#!/usr/bin/env python3
|
|
import sys
|
|
|
|
import numpy as np
|
|
from PIL import Image
|
|
|
|
if len(sys.argv) < 3:
|
|
print("Usage: python white_to_alpha.py <input_image_path> <output_image_path>")
|
|
sys.exit(1)
|
|
|
|
input_path, output_path = sys.argv[1], sys.argv[2]
|
|
|
|
# convert to 64bit floats from 0 - 1
|
|
d = np.asarray(Image.open(input_path).convert("RGBA")).astype(np.float64) / 255.0
|
|
print("Top left corner colour: ", d[0,0])
|
|
|
|
#decompose channels
|
|
# r,g,b,a = d.T
|
|
color = d[:, :, :3]
|
|
|
|
# The amount of white in each pixel
|
|
white = np.array([0.69803922, 0.69803922, 0.69803922])
|
|
white_amount = np.min(color / white, axis = 2)
|
|
alpha = 1 - white_amount
|
|
|
|
premultiplied_new_color = (color - (1 - alpha)[:, :, None] * white[None, None, :])
|
|
new_color = premultiplied_new_color / alpha[:, :, None]
|
|
|
|
original_color = alpha[:,:,None] * new_color + (1 - alpha[:,:,None]) * white
|
|
|
|
new_RGBA = np.concatenate([new_color, alpha[:,:,None]], axis = 2)
|
|
|
|
# Premultiplied alpha, but PIL doesn't seem to support it
|
|
# new_RGBa = np.concatenate([premultiplied_new_color, alpha[:,:,None]], axis = 2)
|
|
# print(np.info(new_RGBA))
|
|
|
|
img = Image.fromarray((new_RGBA * 255).astype(np.uint8), mode = "RGBA")
|
|
img.save(output_path)
|
|
print(f"Image saved to {output_path}") |