PIL problem

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  • bfrederi
    #1

    PIL problem

    I am having a problem using PIL. I am trying to crop and image to a
    square, starting from the center of the image, but when I try to crop
    the image, it won't crop. Here are the relevant code snippets:

    ### Function I am testing ###
    def create_square_i mage(file_name) :
    """ Creates a thumbnail sized image and turns it into a square """
    image = Image.open(open (file_name))

    size_tuple = image.size
    width = size_tuple[0]
    height = size_tuple[1]

    square_length = 75

    x1 = (width / 2) - (square_length / 2)
    x2 = x1 + square_length
    y1 = (height / 2) - (square_length / 2)
    y2 = y1 + square_length

    image.crop((x1, y1,x2,y2))
    image.save(file _name, "JPEG")


    ### In my tests.py ###
    def testCreateSquar eImage(self):
    """ Test to turn image into a square """
    self.convert_fi le = '/home/bfrederi/square-dissertation.jp g'
    tkl_converter.c reate_square_im age(self.conver t_file)
    image = Image.open(self .convert_file)
    if image.size[0] == 75 and image.size[1] == 75:
    self.assert_(Tr ue)
    else:
    self.fail("Widt h: %s Height: %s" % (image.size[0],
    image.size[1]))

    ### Test result ###
    FAIL: Test to turn image into a square
    ----------------------------------------------------------------------
    Traceback (most recent call last):
    File "tests.py", line 462, in testCreateSquar eImage
    self.fail("Widt h: %s Height: %s" % (image.size[0], image.size[1]))
    AssertionError: Width: 75 Height: 97

    ----------------------------------------------------------------------

    The image is unchanged. Anyone have any idea what I'm doing wrong?
    I've tried opening the file, and outputting to a different file
    (instead of overwriting the file), but the new file always comes out
    the same as the original.
    Tags: None
    • Marc 'BlackJack' Rintsch
      #2
      Re: PIL problem

      On Wed, 08 Oct 2008 08:10:02 -0700, bfrederi wrote:
      I am having a problem using PIL. I am trying to crop and image to a
      square, starting from the center of the image, but when I try to crop
      the image, it won't crop. Here are the relevant code snippets:
      >
      ### Function I am testing ###
      def create_square_i mage(file_name) :
      """ Creates a thumbnail sized image and turns it into a square """
      image = Image.open(open (file_name))
      >
      size_tuple = image.size
      width = size_tuple[0]
      height = size_tuple[1]
      >
      square_length = 75
      >
      x1 = (width / 2) - (square_length / 2) x2 = x1 + square_length
      y1 = (height / 2) - (square_length / 2) y2 = y1 + square_length
      >
      image.crop((x1, y1,x2,y2))
      This doesn't change `image` but creates and returns a new cropped image
      which you simply ignore.
      image.save(file _name, "JPEG")
      Ciao,
      Marc 'BlackJack' Rintsch

        Comment

        • bfrederi
          #3
          Re: PIL problem

          On Oct 8, 10:30 am, Marc 'BlackJack' Rintsch <bj_...@gmx.net wrote:
          On Wed, 08 Oct 2008 08:10:02 -0700, bfrederi wrote:
          I am having a problem using PIL. I am trying to crop and image to a
          square, starting from the center of the image, but when I try to crop
          the image, it won't crop. Here are the relevant code snippets:
          >
          ### Function I am testing ###
          def create_square_i mage(file_name) :
              """ Creates a thumbnail sized image and turns it into a square """
              image = Image.open(open (file_name))
          >
              size_tuple = image.size
              width = size_tuple[0]
              height = size_tuple[1]
          >
              square_length = 75
          >
              x1 = (width / 2) - (square_length / 2) x2 = x1 + square_length
              y1 = (height / 2) - (square_length / 2) y2 = y1 + square_length
          >
              image.crop((x1, y1,x2,y2))
          >
          This doesn't change `image` but creates and returns a new cropped image
          which you simply ignore.
          >
              image.save(file _name, "JPEG")
          >
          Ciao,
                  Marc 'BlackJack' Rintsch
          How do I output it to an actual file then? Or overwrite the existing
          file?

            Comment

            • bfrederi
              #4
              Re: PIL problem

              On Oct 8, 10:39 am, bfrederi <brfrederi...@g mail.comwrote:
              On Oct 8, 10:30 am, Marc 'BlackJack' Rintsch <bj_...@gmx.net wrote:
              >
              >
              >
              On Wed, 08 Oct 2008 08:10:02 -0700, bfrederi wrote:
              I am having a problem using PIL. I am trying to crop and image to a
              square, starting from the center of the image, but when I try to crop
              the image, it won't crop. Here are the relevant code snippets:
              >
              ### Function I am testing ###
              def create_square_i mage(file_name) :
                  """ Creates a thumbnail sized image and turns it into a square """
                  image = Image.open(open (file_name))
              >
                  size_tuple = image.size
                  width = size_tuple[0]
                  height = size_tuple[1]
              >
                  square_length = 75
              >
                  x1 = (width / 2) - (square_length / 2) x2 = x1 + square_length
                  y1 = (height / 2) - (square_length / 2) y2 = y1 + square_length
              >
                  image.crop((x1, y1,x2,y2))
              >
              This doesn't change `image` but creates and returns a new cropped image
              which you simply ignore.
              >
                  image.save(file _name, "JPEG")
              >
              Ciao,
                      Marc 'BlackJack' Rintsch
              >
              How do I output it to an actual file then? Or overwrite the existing
              file?
              Nevermind, I gotcha. I needed to do this:

              def create_square_i mage(file_name) :
              """ Creates a thumbnail sized image and turns it into a square """
              image = Image.open(open (file_name))

              size_tuple = image.size
              width = size_tuple[0]
              height = size_tuple[1]

              square_length = 75

              x1 = (width / 2) - (square_length / 2)
              x2 = x1 + square_length
              y1 = (height / 2) - (square_length / 2)
              y2 = y1 + square_length

              new_image = image.crop((x1, y1,x2,y2))
              try:
              new_image.save( file_name, "JPEG")
              except IOError:
              print "Cannot create square image for", file_name

              I needed to output the cropped image by getting the cropped image in
              "new_image" and outputting the new file. I see what you were saying.

                Comment

                • bfrederi
                  #5
                  Re: PIL problem

                  On Oct 8, 10:39 am, bfrederi <brfrederi...@g mail.comwrote:
                  On Oct 8, 10:30 am, Marc 'BlackJack' Rintsch <bj_...@gmx.net wrote:
                  >
                  >
                  >
                  On Wed, 08 Oct 2008 08:10:02 -0700, bfrederi wrote:
                  I am having a problem using PIL. I am trying to crop and image to a
                  square, starting from the center of the image, but when I try to crop
                  the image, it won't crop. Here are the relevant code snippets:
                  >
                  ### Function I am testing ###
                  def create_square_i mage(file_name) :
                      """ Creates a thumbnail sized image and turns it into a square """
                      image = Image.open(open (file_name))
                  >
                      size_tuple = image.size
                      width = size_tuple[0]
                      height = size_tuple[1]
                  >
                      square_length = 75
                  >
                      x1 = (width / 2) - (square_length / 2) x2 = x1 + square_length
                      y1 = (height / 2) - (square_length / 2) y2 = y1 + square_length
                  >
                      image.crop((x1, y1,x2,y2))
                  >
                  This doesn't change `image` but creates and returns a new cropped image
                  which you simply ignore.
                  >
                      image.save(file _name, "JPEG")
                  >
                  Ciao,
                          Marc 'BlackJack' Rintsch
                  >
                  How do I output it to an actual file then? Or overwrite the existing
                  file?
                  Nevermind, I gotcha. I needed to do this:

                  def create_square_i mage(file_name) :
                  """ Creates a thumbnail sized image and turns it into a square """
                  image = Image.open(open (file_name))

                  size_tuple = image.size
                  width = size_tuple[0]
                  height = size_tuple[1]

                  square_length = 75

                  x1 = (width / 2) - (square_length / 2)
                  x2 = x1 + square_length
                  y1 = (height / 2) - (square_length / 2)
                  y2 = y1 + square_length

                  new_image = image.crop((x1, y1,x2,y2))
                  try:
                  new_image.save( file_name, "JPEG")
                  except IOError:
                  print "Cannot create square image for", file_name

                  I needed to output the cropped image by getting the cropped image in
                  "new_image" and outputting the new file. I see what you were saying.

                    Comment

                    • Peter Otten
                      #6
                      Re: PIL problem

                      bfrederi wrote:
                      image.crop((x1, y1,x2,y2))
                      >>
                      >This doesn't change `image` but creates and returns a new cropped image
                      >which you simply ignore.
                      >>
                      image.save(file _name, "JPEG")
                      >>
                      >Ciao,
                      >Marc 'BlackJack' Rintsch
                      >
                      How do I output it to an actual file then? Or overwrite the existing
                      file?
                      cropped_image = image.crop(...)
                      cropped_image.s ave(...)

                      Peter

                        Comment

                        • J Kenneth King
                          #7
                          Re: PIL problem

                          bfrederi <brfredericks@g mail.comwrites:
                          I am having a problem using PIL. I am trying to crop and image to a
                          square, starting from the center of the image, but when I try to crop
                          the image, it won't crop. Here are the relevant code snippets:
                          >
                          ### Function I am testing ###
                          def create_square_i mage(file_name) :
                          """ Creates a thumbnail sized image and turns it into a square """
                          image = Image.open(open (file_name))
                          >
                          size_tuple = image.size
                          width = size_tuple[0]
                          height = size_tuple[1]
                          >
                          square_length = 75
                          >
                          x1 = (width / 2) - (square_length / 2)
                          x2 = x1 + square_length
                          y1 = (height / 2) - (square_length / 2)
                          y2 = y1 + square_length
                          >
                          image.crop((x1, y1,x2,y2))
                          image.save(file _name, "JPEG")
                          def create_square_i mage(filename, size=75):
                          file = open(filename, 'rb')
                          image = Image.open(file )
                          w, h = image.size

                          x1 = (w / 2) - (size / 2)
                          x2 = x1 + size
                          y1 = (h / 2) - (size / 2)
                          y2 = y1 + size

                          thumb = image.crop((x1, y1,x2,y2))
                          thumb.save("thu mb_" + filename, "JPEG")

                          ....

                          of course PIL has a thumbnail method that does this type of stuff.

                            Comment

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