Figure 1: An image I borrowed from a Seagate presentation by John Bent. It has white background, which doesn’t blend in with my blog’s background.
So, I ended up writing a quick Python code to change the background color, which can be copied below or can be cloned from my repository.
# Replacing a target color in an image with another one
# 09/30/2021, tetraquark@gmail.com
# https://tetraquark.netlify.app/post/pythonRecolor/index.html
from PIL import Image
import math
imgName= 'C:/Users/451516/Documents/github/tetraquark_c_tester/content/post/energyflow/spr.png'
img = Image.open(imgName)
pixels = img.load()
targetColor=[255,255,255] # the original color
replacementColor=(245,244,241) # replacement color
#replacementColor=(255,0,0)
offsetSquared=100 # this is the sum of the squares of RGB values. Set this to 0 if you want the exact RGB value
for i in range(img.size[0]):
for j in range(img.size[1]):
if (pixels[i, j][0]-targetColor[0])**2 +(pixels[i, j][1]-targetColor[1])**2 +(pixels[i, j][2]-targetColor[1])**2 < offsetSquared:
pixels[i, j] = replacementColor
#img.show()
imgNameS=imgName.split(".")
img.save(imgNameS[0]+"_recolored."+imgNameS[1] )
Figure 2: The same image with the white background changed to (245,244,241).
If you have many such images, I have another version of the script that loops through the images in a selected folder. Find it in my repository.