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   "source": [
    "# 3. More on images"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "1. Import the numpy and skimage packages"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "2. Using the skimage import function, load the image visible at this link: http://wiki.cmci.info/sampleimages/cells_Actin.tif\n",
    "and put it in a variable called image"
   ]
  },
  {
   "cell_type": "markdown",
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   "source": [
    "3. Check what are the dimensions of the image"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "4. Check what is the image type. Is it an 8 or 16 bit image ?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "5. Plot the image using Matplotlib (that you have to import). Change the color map to 'gray' and make the image larger"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "6. Plot a histogram of the pixel values. Change the bin size to better see the distribution"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 3b. More on images: cropping, logical indexing"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "1. Make a cropped version of the image by selecting 100 rows for which you want all columns and plot it."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "2. Select a region in the image of 100x100 pixesl and create a cropped image. Plot it."
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "3. Using this second cropped image, create a boolean mask by finding all pixels above some reasonable threshold (use the histogram above to find a value)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "4. Plot your mask"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "5. Get all the values of all the pixels which are selected in the mask and store in a variable"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "6. Plot a histogram of all the values"
   ]
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