Creating a custom image welcome banner in Discord

Question

So I am currently trying to create a Discord bot that creates a custom welcome image when someone joins the server. However, there is no output on the image selected and there are no error outputs whenever I run the bot. I assumed I did not enable Privileged Intents but I have so I am stuck as to why it is not outputting anything when I log into my test server using my test account! You can find my code below :

#importing dependencies

import numpy as np
import logging
import discord
import PIL
import asyncio
import os

#importing commands from above dependencies

from discord import client
from discord.ext import commands
from PIL import Image, ImageFont, ImageDraw
from discord.member import Member

#enabling privileged intents

intents = discord.Intents.default()
intents.members = True
intents.presences = True
client = discord.Client(intents=intents)

#for custom image welcome message

@client.event
async def on_member_join(ctx, member: discord.Member = None):

    if member == None:
        member = ctx.author
    channel = client.get_channel("TOKEN")

    #-----------------------------------------------------------------------------#   

    #transforming user's avatar into a circle

    # Open the input image as numpy array, convert to RGB
    img=Image.open(member.avatar_url).convert("RGB")
    npImage=np.array(img)
    h,w=img.size

    # Create same size alpha layer with circle
    alpha = Image.new('L', img.size,0)
    draw = ImageDraw.Draw(alpha)
    draw.pieslice([0,0,h,w],0,360,fill=255)

    # Convert alpha Image to numpy array
    npAlpha=np.array(alpha)

    # Add alpha layer to RGB
    npImage=np.dstack((npImage,npAlpha))

    # Save with alpha
    Image.fromarray(npImage).save("D:\Coding\Python\Projects\discord_moderation_bot\imgs\result.png")
    
    #-----------------------------------------------------------------------------#
    
    #pasting user avatar into welcome banner
    
    img = Image.open("D:\Coding\Python\Projects\discord_moderation_bot\imgs\welcome_banner.png")
    pfp = Image.open("D:\Coding\Python\Projects\discord_moderation_bot\imgs\result.png")
    
    pfp = pfp.resize ((167, 167))

    img.paste(pfp, (120, 104))

    img.save("D:\Coding\Python\Projects\discord_moderation_bot\imgs\welcome.jpg")

    await ctx.send(file = discord.File("welcome.jpg"))


client.run("TOKEN")

Thanks in advance!

Answer 1

When troubleshooting code that interacts with an external app like this, it's a good idea to test your own part first, as a standalone script. In this case, if I test your image manipulation code alone, it fails because the final image is in paletted mode (P), and you try to save it as a JPEG, which needs to be RGB. This can be fixed by converting the mode first. But there are some other issues, namely:

• You have the signature for on_member_join wrong. It accepts only a single argument, the member in question.
• You pick a channel, but then attempt to send the message from ctx instead.
• member.avatar_url is a URL, which Pillow can't open directly. This answer handily shows how to do so, however. Note that you'll need to install Requests.
• Using NumPy here works, but you don't actually need it, since this can all be accomplished through Pillow.
• You don't need to save and reopen the cropped avatar; use the object you're already working with.
• Perhaps you need it for other things your bot is doing, but for this, you don't need the presences intent, only members.
• It's not causing a problem with the code, but I think you're a little confused about import statements. You don't need to import a module first just to then import specific parts of it; that is, you can do from x import y without first doing import x. And there's no need for from x import y if you plan to reference it as x.y in your code.
• I'd recommend using pathlib. It's very convenient for working with file paths.

Here's a rewritten version that works for me:

from pathlib import Path

import discord
import requests
from PIL import Image, ImageDraw

# Enabling privileged intents
intents = discord.Intents.default()
intents.members = True
client = discord.Client(intents=intents)

# When using pathlib, use forward slashes, even on Windows.
img_dir = Path("D:/Coding/Python/Projects/discord_moderation_bot/imgs")

@client.event
async def on_member_join(member):
    """Display custom welcome message banner."""
    # Open the input image, convert to RGB
    avatar_bytes = requests.get(member.avatar_url, stream=True).raw
    avatar = Image.open(avatar_bytes).convert("RGB")

    # Create same size alpha layer with circle, and apply to avatar
    alpha = Image.new("L", avatar.size, 0)
    draw = ImageDraw.Draw(alpha)
    draw.ellipse([(0, 0), avatar.size], fill=255)
    avatar.putalpha(alpha)

    avatar = avatar.resize((167, 167))

    # Open banner and alpha-composite avatar onto it
    banner = Image.open(img_dir / "welcome_banner.png").convert("RGBA")
    overlay = Image.new("RGBA", banner.size, 0)
    overlay.paste(avatar, (120, 104))
    banner.alpha_composite(overlay)

    # Convert to RGB mode to save as JPG. Append user name, so that we
    # don't upload the wrong image if two users join at almost the same
    # time.
    welcome_file_path = img_dir / f"welcome_{member.name}.jpg"
    banner.convert("RGB").save(welcome_file_path)

    # Post the image.
    channel = client.get_channel("CHANNEL ID")
    await channel.send(file=discord.File(welcome_file_path))

client.run("TOKEN")