Assignment_14.ipynb

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    "kernelspec": {
      "name": "python3",
      "display_name": "Python 3"
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    "language_info": {
      "name": "python"
    }
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  "cells": [
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "qKwCiP5177X2"
      },
      "source": [
        "\n",
        "# Python Basic 14\n",
        "\n"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "nkHUi6AN90SC"
      },
      "source": [
        "1. What does RGBA stand for?"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "n12wX2Qf90Ou"
      },
      "source": [
        "Ans.\n",
        "*  RGBA stands for red, green, blue, and alpha (transparency) in the color\n",
        "*  An RGBA value is a tuple of 4 integers, each ranging from 0 to 255. The four integers correspond\n",
        "to the amount of red, green, blue, and alpha (transparency) in the color   \n"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "UUZcv1SG90MM"
      },
      "source": [
        "------------\n",
        "\n",
        "2. From the Pillow module, how do you get the RGBA value of any images?"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "2FUlv_SJABh4",
        "outputId": "ee5747bb-e2eb-4a94-bf43-28d8cc6768ff"
      },
      "source": [
        "from PIL import ImageColor\n",
        "ImageColor.getcolor('green', 'RGBA')\n",
        "ImageColor.getcolor('red', 'RGBA')"
      ],
      "execution_count": 1,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "(255, 0, 0, 255)"
            ]
          },
          "metadata": {},
          "execution_count": 1
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "WUjqtiOK90J0"
      },
      "source": [
        "----------\n",
        "3. What is a box tuple, and how does it work?"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "-8ORfnTD90HL"
      },
      "source": [
        "*  Ans.  A box tuple is a tuple value of four integers: the left edge x-coordinate, the top edge y-coordinate, the width, and the height, respectively"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "tarZ6szy9zo3"
      },
      "source": [
        "-----------\n",
        "4. Use your image and load in notebook then, How can you find out the width and height of an\n",
        "Image object?"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 74
        },
        "id": "VZZcIxYK7qHY",
        "outputId": "6770378f-2767-4246-c36a-164ebfb1bdb0"
      },
      "source": [
        "from google.colab import files\n",
        "uploaded = files.upload()"
      ],
      "execution_count": 2,
      "outputs": [
        {
          "output_type": "display_data",
          "data": {
            "text/plain": [
              "<IPython.core.display.HTML object>"
            ],
            "text/html": [
              "\n",
              "     <input type=\"file\" id=\"files-6c86f082-ce58-458d-9263-489a6aa8b60e\" name=\"files[]\" multiple disabled\n",
              "        style=\"border:none\" />\n",
              "     <output id=\"result-6c86f082-ce58-458d-9263-489a6aa8b60e\">\n",
              "      Upload widget is only available when the cell has been executed in the\n",
              "      current browser session. Please rerun this cell to enable.\n",
              "      </output>\n",
              "      <script>// Copyright 2017 Google LLC\n",
              "//\n",
              "// Licensed under the Apache License, Version 2.0 (the \"License\");\n",
              "// you may not use this file except in compliance with the License.\n",
              "// You may obtain a copy of the License at\n",
              "//\n",
              "//      http://www.apache.org/licenses/LICENSE-2.0\n",
              "//\n",
              "// Unless required by applicable law or agreed to in writing, software\n",
              "// distributed under the License is distributed on an \"AS IS\" BASIS,\n",
              "// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n",
              "// See the License for the specific language governing permissions and\n",
              "// limitations under the License.\n",
              "\n",
              "/**\n",
              " * @fileoverview Helpers for google.colab Python module.\n",
              " */\n",
              "(function(scope) {\n",
              "function span(text, styleAttributes = {}) {\n",
              "  const element = document.createElement('span');\n",
              "  element.textContent = text;\n",
              "  for (const key of Object.keys(styleAttributes)) {\n",
              "    element.style[key] = styleAttributes[key];\n",
              "  }\n",
              "  return element;\n",
              "}\n",
              "\n",
              "// Max number of bytes which will be uploaded at a time.\n",
              "const MAX_PAYLOAD_SIZE = 100 * 1024;\n",
              "\n",
              "function _uploadFiles(inputId, outputId) {\n",
              "  const steps = uploadFilesStep(inputId, outputId);\n",
              "  const outputElement = document.getElementById(outputId);\n",
              "  // Cache steps on the outputElement to make it available for the next call\n",
              "  // to uploadFilesContinue from Python.\n",
              "  outputElement.steps = steps;\n",
              "\n",
              "  return _uploadFilesContinue(outputId);\n",
              "}\n",
              "\n",
              "// This is roughly an async generator (not supported in the browser yet),\n",
              "// where there are multiple asynchronous steps and the Python side is going\n",
              "// to poll for completion of each step.\n",
              "// This uses a Promise to block the python side on completion of each step,\n",
              "// then passes the result of the previous step as the input to the next step.\n",
              "function _uploadFilesContinue(outputId) {\n",
              "  const outputElement = document.getElementById(outputId);\n",
              "  const steps = outputElement.steps;\n",
              "\n",
              "  const next = steps.next(outputElement.lastPromiseValue);\n",
              "  return Promise.resolve(next.value.promise).then((value) => {\n",
              "    // Cache the last promise value to make it available to the next\n",
              "    // step of the generator.\n",
              "    outputElement.lastPromiseValue = value;\n",
              "    return next.value.response;\n",
              "  });\n",
              "}\n",
              "\n",
              "/**\n",
              " * Generator function which is called between each async step of the upload\n",
              " * process.\n",
              " * @param {string} inputId Element ID of the input file picker element.\n",
              " * @param {string} outputId Element ID of the output display.\n",
              " * @return {!Iterable<!Object>} Iterable of next steps.\n",
              " */\n",
              "function* uploadFilesStep(inputId, outputId) {\n",
              "  const inputElement = document.getElementById(inputId);\n",
              "  inputElement.disabled = false;\n",
              "\n",
              "  const outputElement = document.getElementById(outputId);\n",
              "  outputElement.innerHTML = '';\n",
              "\n",
              "  const pickedPromise = new Promise((resolve) => {\n",
              "    inputElement.addEventListener('change', (e) => {\n",
              "      resolve(e.target.files);\n",
              "    });\n",
              "  });\n",
              "\n",
              "  const cancel = document.createElement('button');\n",
              "  inputElement.parentElement.appendChild(cancel);\n",
              "  cancel.textContent = 'Cancel upload';\n",
              "  const cancelPromise = new Promise((resolve) => {\n",
              "    cancel.onclick = () => {\n",
              "      resolve(null);\n",
              "    };\n",
              "  });\n",
              "\n",
              "  // Wait for the user to pick the files.\n",
              "  const files = yield {\n",
              "    promise: Promise.race([pickedPromise, cancelPromise]),\n",
              "    response: {\n",
              "      action: 'starting',\n",
              "    }\n",
              "  };\n",
              "\n",
              "  cancel.remove();\n",
              "\n",
              "  // Disable the input element since further picks are not allowed.\n",
              "  inputElement.disabled = true;\n",
              "\n",
              "  if (!files) {\n",
              "    return {\n",
              "      response: {\n",
              "        action: 'complete',\n",
              "      }\n",
              "    };\n",
              "  }\n",
              "\n",
              "  for (const file of files) {\n",
              "    const li = document.createElement('li');\n",
              "    li.append(span(file.name, {fontWeight: 'bold'}));\n",
              "    li.append(span(\n",
              "        `(${file.type || 'n/a'}) - ${file.size} bytes, ` +\n",
              "        `last modified: ${\n",
              "            file.lastModifiedDate ? file.lastModifiedDate.toLocaleDateString() :\n",
              "                                    'n/a'} - `));\n",
              "    const percent = span('0% done');\n",
              "    li.appendChild(percent);\n",
              "\n",
              "    outputElement.appendChild(li);\n",
              "\n",
              "    const fileDataPromise = new Promise((resolve) => {\n",
              "      const reader = new FileReader();\n",
              "      reader.onload = (e) => {\n",
              "        resolve(e.target.result);\n",
              "      };\n",
              "      reader.readAsArrayBuffer(file);\n",
              "    });\n",
              "    // Wait for the data to be ready.\n",
              "    let fileData = yield {\n",
              "      promise: fileDataPromise,\n",
              "      response: {\n",
              "        action: 'continue',\n",
              "      }\n",
              "    };\n",
              "\n",
              "    // Use a chunked sending to avoid message size limits. See b/62115660.\n",
              "    let position = 0;\n",
              "    do {\n",
              "      const length = Math.min(fileData.byteLength - position, MAX_PAYLOAD_SIZE);\n",
              "      const chunk = new Uint8Array(fileData, position, length);\n",
              "      position += length;\n",
              "\n",
              "      const base64 = btoa(String.fromCharCode.apply(null, chunk));\n",
              "      yield {\n",
              "        response: {\n",
              "          action: 'append',\n",
              "          file: file.name,\n",
              "          data: base64,\n",
              "        },\n",
              "      };\n",
              "\n",
              "      let percentDone = fileData.byteLength === 0 ?\n",
              "          100 :\n",
              "          Math.round((position / fileData.byteLength) * 100);\n",
              "      percent.textContent = `${percentDone}% done`;\n",
              "\n",
              "    } while (position < fileData.byteLength);\n",
              "  }\n",
              "\n",
              "  // All done.\n",
              "  yield {\n",
              "    response: {\n",
              "      action: 'complete',\n",
              "    }\n",
              "  };\n",
              "}\n",
              "\n",
              "scope.google = scope.google || {};\n",
              "scope.google.colab = scope.google.colab || {};\n",
              "scope.google.colab._files = {\n",
              "  _uploadFiles,\n",
              "  _uploadFilesContinue,\n",
              "};\n",
              "})(self);\n",
              "</script> "
            ]
          },
          "metadata": {}
        },
        {
          "output_type": "stream",
          "name": "stdout",
          "text": [
            "Saving photo.jpeg to photo.jpeg\n"
          ]
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "colab": {
          "base_uri": "https://localhost:8080/"
        },
        "id": "QWcSbskj8VGh",
        "outputId": "fe85312e-b642-4ed7-a00e-b21b987f6363"
      },
      "source": [
        "from PIL import Image\n",
        "myImg = Image.open('photo.jpeg')\n",
        "w,h = myImg.size\n",
        "w,h"
      ],
      "execution_count": 4,
      "outputs": [
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "(800, 800)"
            ]
          },
          "metadata": {},
          "execution_count": 4
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "9ko5jN4CAixJ"
      },
      "source": [
        "---------\n",
        "\n",
        "5. What method would you call to get Image object for a 100×100 image, excluding the lower-left\n",
        "quarter of it?"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "RhXYC5jYAioR"
      },
      "source": [
        "*  Ans. ImageObject.crop((0, 50, 50, 50))"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "X-RSkkbmAiaR"
      },
      "source": [
        "--------\n",
        "6. After making changes to an Image object, how could you save it as an image file?"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "1ekXeldHAiQ3"
      },
      "source": [
        "\n",
        "*  Ans. By Calling the imageObj.save('new_filename.png') method of the Image object."
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "o7buRL4TAiF8"
      },
      "source": [
        "---------\n",
        "\n",
        "\n",
        "7. What module contains Pillow’s shape-drawing code?"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "D3xalRRfAh7G"
      },
      "source": [
        "*  Ans. The ImageDraw module contains code to draw on images"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "vgWifX4yAhyG"
      },
      "source": [
        "--------\n",
        "\n",
        "\n",
        "8. Image objects do not have drawing methods. What kind of object does? How do you get this kind\n",
        "of object?"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "gHp0LSWvAhos"
      },
      "source": [
        "* Ans. ImageDraw objects have shape-drawing methods such as point(), line(), or rectangle(). They are returned by passing the Image object to the ImageDraw.Draw() function"
      ]
    },
    {
      "cell_type": "markdown",
      "source": [
        "------------\n",
        "------------"
      ],
      "metadata": {
        "id": "Osky-OWQzSm-"
      }
    }
  ]
}