pillow.ipynb

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   "source": [
    "## Pillow\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Basic reading manipulating images"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "<PIL.JpegImagePlugin.JpegImageFile image mode=RGB size=1300x1368 at 0x10A674A20>\n"
     ]
    }
   ],
   "source": [
    "from PIL import Image\n",
    "\n",
    "img = Image.open('scrabble-board.jpg')\n",
    "print(img)\n",
    "img.show()\n",
    "img.save('output.png')\n",
    "\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Basic reading manipulating images"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "#pixel values to crop\n",
    "cords = (100,100,400,400)\n",
    "\n",
    "cropped  = img.crop(cords)\n",
    "\n",
    "cropped.show()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Getting pixel values"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "(234, 230, 231)"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "img.getpixel((100,100)) # give the rgb"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "231"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "greyscale = img.convert('L') \n",
    "greyscale.getpixel((100,100)) # gives single greyscale value"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "##### Geometric transforms"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [],
   "source": [
    "img.resize((50,50)).show()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [],
   "source": [
    "img.rotate(90).show()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {},
   "outputs": [],
   "source": [
    "from PIL import ImageEnhance\n",
    "img_enhance = ImageEnhance.Brightness(img)\n",
    "#increases brightness, arg is factor by which to enhance brightness < 1 is decreasing brightness\n",
    "img_enhance.enhance(2).show()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {},
   "outputs": [],
   "source": [
    "from PIL import ImageEnhance\n",
    "img_contrast = ImageEnhance.Contrast(img)\n",
    "#increases brightness, arg is factor by which to enhance brightness < 1 is decreasing brightness\n",
    "img_contrast.enhance(2).show()"
   ]
  }
 ],
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