Airr

You could do this using Python, but first you'll need to install the pil module.

Below is a bash script to install the module and libs that you need (you'll need Xcode/Xcode Command Line Tools installed):

#!/bin/bash
JPEG_LION="http://rudix.googlecode.com/files/libjpeg-8d-0.pkg"
JPEG_SNOW="http://rudix-snowleopard.googlecode.com/files/libjpeg-8d-0.pkg"

echo "Select MacOS Version:"
echo "[1] Lion"
echo "[2] Snow Leopard"
read selection

case $selection in
1) OPTION=$JPEG_LION;;
2) OPTION=$JPEG_SNOW;;
*) Echo "No Selection Made"
	exit 0
	;;
esac
curl -O $OPTION

sudo installer -pkg libjpeg-8d-0.pkg -target /
sudo easy_install pip
sudo pip install pil
sudo pip install pillow

Then you could try something like this in Python:

#!/usr/bin/env python
import os,sys,urllib2,Image,ImageDraw,ImageFont
fname = raw_input("Enter Filename: ")
txt = open(fname).readlines()
asset,text1,text2,blank = txt
savedFilename = os.path.basename(asset).strip()
imgfile = urllib2.urlopen(asset)
savedfile = open(savedFilename,'wb')
savedfile.write(imgfile.read())
savedfile.close()

im = Image.open(savedFilename)
font = ImageFont.truetype('/Library/Fonts/Verdana Bold.ttf',14)
box = im.getbbox()
im2=im.crop((box[0], box[1], box[2], box[3]+50))
draw=ImageDraw.Draw(im2)
draw.text((box[1]+10,box[3]+10), text1.strip(),font=font)
draw.text((box[1]+10,box[3]+30), text2.strip(), font=font)
im2.save('output.jpg','JPEG')

The Python script reads a single text file that has the 3 entries you listed, terminated with a blank line.

HTH,

AIR.