{
  "id": 46999,
  "title": "File Format JPEG or TIFF?",
  "url": "/competitions/sp-society-camera-model-identification/discussion/46999",
  "author_name": "",
  "post_date": "2018-01-06T16:18:53.351524400Z",
  "votes": 1,
  "comment_count": 4,
  "views": 0,
  "content": "<p>The training set images have been saved as JPEG files using the settings of the devices. However, the testing set images are in TIFF format. Why is the JPEG files of test images are not given? Can we expect them to retain the camera model specific JPEG compression signatures even if they are in TIFF format? Thanks in advance </p>",
  "messages": [
    {
      "id": "265761",
      "postDate": "01/06/2018 16:18:53",
      "content": "<p>The training set images have been saved as JPEG files using the settings of the devices. However, the testing set images are in TIFF format. Why is the JPEG files of test images are not given? Can we expect them to retain the camera model specific JPEG compression signatures even if they are in TIFF format? Thanks in advance </p>",
      "rawMarkdown": "The training set images have been saved as JPEG files using the settings of the devices. However, the testing set images are in TIFF format. Why is the JPEG files of test images are not given? Can we expect them to retain the camera model specific JPEG compression signatures even if they are in TIFF format? Thanks in advance",
      "votes": null
    },
    {
      "id": "265815",
      "postDate": "01/06/2018 19:25:45",
      "content": "<p>tiff is a lossless format, so it should be the case</p>",
      "rawMarkdown": "tiff is a lossless format, so it should be the case",
      "votes": null
    },
    {
      "id": "265826",
      "postDate": "01/06/2018 20:11:52",
      "content": "<p>They have saved them as TIFF so we don't have the JPEG EXIF metadata.</p>",
      "rawMarkdown": "They have saved them as TIFF so we don't have the JPEG EXIF metadata.",
      "votes": null
    },
    {
      "id": "270622",
      "postDate": "01/18/2018 15:53:40",
      "content": "<p>Just found that test set images are actually in PNG format with TIF extension. Not sure if this changes anything, but at least PNG files are smaller than TIF.</p>",
      "rawMarkdown": "Just found that test set images are actually in PNG format with TIF extension. Not sure if this changes anything, but at least PNG files are smaller than TIF.",
      "votes": null
    },
    {
      "id": "274432",
      "postDate": "01/26/2018 15:40:17",
      "content": "<p>Good catch. I was getting error when trying to open the test TIF images using the default Image Viewer in Ubuntu. When I changed the extension to PNG, the test images open fine. \nIt is not clear why the test images have TIF extension.</p>",
      "rawMarkdown": "Good catch. I was getting error when trying to open the test TIF images using the default Image Viewer in Ubuntu. When I changed the extension to PNG, the test images open fine. \nIt is not clear why the test images have TIF extension.",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 265815,
      "author_name": "mxdbld",
      "author_url": "",
      "post_date": "01/06/2018 19:25:45",
      "content": "<p>tiff is a lossless format, so it should be the case</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 265826,
      "author_name": "craigglastonbury",
      "author_url": "",
      "post_date": "01/06/2018 20:11:52",
      "content": "<p>They have saved them as TIFF so we don't have the JPEG EXIF metadata.</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 270622,
      "author_name": "alexfir",
      "author_url": "",
      "post_date": "01/18/2018 15:53:40",
      "content": "<p>Just found that test set images are actually in PNG format with TIF extension. Not sure if this changes anything, but at least PNG files are smaller than TIF.</p>",
      "votes": null,
      "replies": [
        {
          "id": 274432,
          "author_name": "sauravrt",
          "author_url": "",
          "post_date": "01/26/2018 15:40:17",
          "content": "<p>Good catch. I was getting error when trying to open the test TIF images using the default Image Viewer in Ubuntu. When I changed the extension to PNG, the test images open fine. \nIt is not clear why the test images have TIF extension.</p>",
          "votes": null,
          "replies": []
        }
      ]
    }
  ],
  "raw_markdown_by_id": {
    "265761": "The training set images have been saved as JPEG files using the settings of the devices. However, the testing set images are in TIFF format. Why is the JPEG files of test images are not given? Can we expect them to retain the camera model specific JPEG compression signatures even if they are in TIFF format? Thanks in advance",
    "265815": "tiff is a lossless format, so it should be the case",
    "265826": "They have saved them as TIFF so we don't have the JPEG EXIF metadata.",
    "270622": "Just found that test set images are actually in PNG format with TIF extension. Not sure if this changes anything, but at least PNG files are smaller than TIF.",
    "274432": "Good catch. I was getting error when trying to open the test TIF images using the default Image Viewer in Ubuntu. When I changed the extension to PNG, the test images open fine. \nIt is not clear why the test images have TIF extension."
  },
  "source": "meta"
}