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To: Tiff List <tiff@lists.osgeo.org>
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Subject: [Tiff] Tiff Thumbnail questions
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As I want to work with some rather large, high-resolution TIFF files 
obtained from an older (HP?) scanner, I am looking for a way to allow my 
app to generate a usable thumbnail.

I have looked at the thumbnail utility I found as part of gnuwin32, 
presumably associated with libtiff, but it seems that, while it does 
create a thumbnail image, and apparently attaches it to the existing 
file - my assumption from the description and the resulting file size - 
tiffinfo & tiffdump don't seem to give me any information about two 
images - or I just don't know how to interpret the data

/c:\gnuwin32\bin\tiffdump.exe xxxxtLetter14Jan2001-page4-2400dpi-thumb.tif//
//PaulJohnWiegertLetter14Jan2001-page4-2400dpi-thumb.tif://
//Magic: 0x4949 <little-endian> Version: 0x2a//
//Directory 0: offset 59744 (0xe960) next 0 (0)//
//SubFileType (254) LONG (4) 1<1>//
//ImageWidth (256) SHORT (3) 1<216>//
//ImageLength (257) SHORT (3) 1<274>//
//BitsPerSample (258) SHORT (3) 1<8>//
//Compression (259) SHORT (3) 1<32773>//
//Photometric (262) SHORT (3) 1<0>//
//StripOffsets (273) LONG (4) 1<8>//
//Orientation (274) SHORT (3) 1<1>//
//SamplesPerPixel (277) SHORT (3) 1<1>//
//StripByteCounts (279) LONG (4) 1<59735>//
//PlanarConfig (284) SHORT (3) 1<1>//
//SubIFD (330) LONG (4) 1<71663894>//
//
//D:\pkg\wx\MSVC2019\_3.1.2_2019\wxMeta\TestFiles\TIFF>c:\gnuwin32\bin\tiffinfo.exe 
xxxxtLetter14Jan2001-page4-2400dpi-thumb.tif//
//TIFF Directory at offset 0xe960 (59744)//
//  Subfile Type: reduced-resolution image (1 = 0x1)//
//  Image Width: 216 Image Length: 274//
//  Bits/Sample: 8//
//  Compression Scheme: PackBits//
//  Photometric Interpretation: min-is-white//
//  Orientation: row 0 top, col 0 lhs//
//  Samples/Pixel: 1//
//  Planar Configuration: single image plane//
//  SubIFD Offsets: 71663894//
/
FWIW, I am very new to TIFF & libtiff and, aside from trying to find a 
way to come up with a thumbnail image, am also very curious to find ways 
and utilities to help me understand the format better.

The questions I have not found answers to - after googling for the best 
part of a couple of days :

  * The libtiff version I am using in my app is 4.0.1 - the gnuwin32
    utilities are all version 3.8.2 - is there any significant
    difference in this respect
  * why do these two utilities not show that there are in fact two
    images in the test file?
  * is there a recommended utility to list all pages - or is there a
    recommended test image which I could refer to?

Results from one utility which looks very helpful, but because I don't 
know TIFF well enough, find a bit confusing are shown below:

 From the utility DPF mamager - using the Baseline TIFF 6.0


    xxxxtLetter14Jan2001-page4-2400dpi-thumb.tif


        D:\pkg\wx\MSVC2019\_3.1.2_2019\wxMeta\TestFiles\TIFF\xxxxtLetter14Jan2001-page4-2400dpi-thumb.tif


        Size: 68 Mb

Baseline TIFF 6.0

	Errors 	Warnings
Baseline TIFF 6.0 	2 	2





        File structure

Elements

  * IFD0 - Thumbnail
      o SubIFD - Main image


        Conformance checker

Show infos


          Baseline TIFF 6.0

Type 	ID 	Location 	Description

	IFDI-0004 	IFD1 	Image IFD must have tag X Resolution

	IFDI-0005 	IFD1 	Image IFD must have tag Y Resolution

	TAG-284-0005 	IFD1 	PlanarConfiguration is irrelevant if 
SamplesPerPixel is 1, and need not be included.

	TAG-284-0005 	IFD1 	PlanarConfiguration is irrelevant if 
SamplesPerPixel is 1, and need not be included

More questions:

  * the file structure shown is the inverse of what I would have expected
  * it does show to images - why don't the Tiff utilities not show the same
  * DPF manager output refers to 2 error and 2 warning - but the Tiff
    utilities don't.
  * Is this due to the different versions? wrong options for the Tiff
    utilities? or ??
  * is there a similar Tiff utility which would show the file structure?
    DPF Manager seems a bit overkill just to inspect that issue.

TIA for reading this far and for any pointers or other information to 
help me sort this out.





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  </head>
  <body>
    <p>As I want to work with some rather large, high-resolution TIFF
      files obtained from an older (HP?) scanner, I am looking for a way
      to allow my app to generate a usable thumbnail. <br>
    </p>
    <p>I have looked at the thumbnail utility I found as part of
      gnuwin32, presumably associated with libtiff, but it seems that,
      while it does create a thumbnail image, and apparently attaches it
      to the existing file - my assumption from the description and the
      resulting file size - tiffinfo &amp; tiffdump don't seem to give
      me any information about two images - or I just don't know how to
      interpret the data</p>
    <p><i>c:\gnuwin32\bin\tiffdump.exe
        xxxxtLetter14Jan2001-page4-2400dpi-thumb.tif</i><i><br>
      </i><i>PaulJohnWiegertLetter14Jan2001-page4-2400dpi-thumb.tif:</i><i><br>
      </i><i>Magic: 0x4949 &lt;little-endian&gt; Version: 0x2a</i><i><br>
      </i><i>Directory 0: offset 59744 (0xe960) next 0 (0)</i><i><br>
      </i><i>SubFileType (254) LONG (4) 1&lt;1&gt;</i><i><br>
      </i><i>ImageWidth (256) SHORT (3) 1&lt;216&gt;</i><i><br>
      </i><i>ImageLength (257) SHORT (3) 1&lt;274&gt;</i><i><br>
      </i><i>BitsPerSample (258) SHORT (3) 1&lt;8&gt;</i><i><br>
      </i><i>Compression (259) SHORT (3) 1&lt;32773&gt;</i><i><br>
      </i><i>Photometric (262) SHORT (3) 1&lt;0&gt;</i><i><br>
      </i><i>StripOffsets (273) LONG (4) 1&lt;8&gt;</i><i><br>
      </i><i>Orientation (274) SHORT (3) 1&lt;1&gt;</i><i><br>
      </i><i>SamplesPerPixel (277) SHORT (3) 1&lt;1&gt;</i><i><br>
      </i><i>StripByteCounts (279) LONG (4) 1&lt;59735&gt;</i><i><br>
      </i><i>PlanarConfig (284) SHORT (3) 1&lt;1&gt;</i><i><br>
      </i><i>SubIFD (330) LONG (4) 1&lt;71663894&gt;</i><i><br>
      </i><i><br>
      </i><i>D:\pkg\wx\MSVC2019\_3.1.2_2019\wxMeta\TestFiles\TIFF&gt;c:\gnuwin32\bin\tiffinfo.exe
        xxxxtLetter14Jan2001-page4-2400dpi-thumb.tif</i><i><br>
      </i><i>TIFF Directory at offset 0xe960 (59744)</i><i><br>
      </i><i>  Subfile Type: reduced-resolution image (1 = 0x1)</i><i><br>
      </i><i>  Image Width: 216 Image Length: 274</i><i><br>
      </i><i>  Bits/Sample: 8</i><i><br>
      </i><i>  Compression Scheme: PackBits</i><i><br>
      </i><i>  Photometric Interpretation: min-is-white</i><i><br>
      </i><i>  Orientation: row 0 top, col 0 lhs</i><i><br>
      </i><i>  Samples/Pixel: 1</i><i><br>
      </i><i>  Planar Configuration: single image plane</i><i><br>
      </i><i>  SubIFD Offsets: 71663894</i><i><br>
      </i><br>
      FWIW, I am very new to TIFF &amp; libtiff and, aside from trying
      to find a way to come up with a thumbnail image, am also very
      curious to find ways and utilities to help me understand the
      format better.</p>
    <p>The questions I have not found answers to - after googling for
      the best part of a couple of days :</p>
    <ul>
      <li>The libtiff version I am using in my app is 4.0.1 - the
        gnuwin32 utilities are all version 3.8.2 - is there any
        significant difference in this respect</li>
      <li>why do these two utilities not show that there are in fact two
        images in the test file?</li>
      <li>is there a recommended utility to list all pages - or is there
        a recommended test image which I could refer to?</li>
    </ul>
    <p>Results from one utility which looks very helpful, but because I
      don't know TIFF well enough, find a bit confusing are shown below:<br>
    </p>
    <p>From the utility DPF mamager - using the Baseline TIFF 6.0 <br>
    </p>
    <div class="col-md-12 bot20 text-center-sm" style="box-sizing:
      border-box; position: relative; min-height: 1px; padding-right:
      15px; padding-left: 15px; float: left; width: 646.65625px;
      margin-bottom: 20px; color: rgb(51, 51, 51); font-family: Roboto,
      sans-serif; font-size: 14px; font-style: normal; font-variant:
      normal; font-weight: normal; letter-spacing: normal; line-height:
      20px; orphans: auto; text-align: start; text-indent: 0px;
      text-transform: none; white-space: normal; widows: auto;
      word-spacing: 0px; -webkit-text-stroke-width: 0px;
      background-color: rgb(51, 51, 51);">
      <h2 style="box-sizing: border-box; font-family: 'Roboto Bold',
        sans-serif; font-weight: 500; line-height: 1.1; color: rgb(170,
        170, 170); margin-top: 20px; margin-bottom: 10px; font-size:
        30px;">xxxxtLetter14Jan2001-page4-2400dpi-thumb.tif</h2>
      <h4 class="color-grey" style="box-sizing: border-box; font-family:
        inherit; font-weight: 500; line-height: 1.1; color: rgb(170,
        170, 170); margin-top: 10px; margin-bottom: 10px; font-size:
        18px;">D:\pkg\wx\MSVC2019\_3.1.2_2019\wxMeta\TestFiles\TIFF\xxxxtLetter14Jan2001-page4-2400dpi-thumb.tif</h4>
      <h4 class="color-grey" style="box-sizing: border-box; font-family:
        inherit; font-weight: 500; line-height: 1.1; color: rgb(170,
        170, 170); margin-top: 10px; margin-bottom: 10px; font-size:
        18px;">Size: 68 Mb</h4>
      <div class="error" style="box-sizing: border-box; color: red;"><span
          class="Apple-converted-space"> </span>Baseline TIFF 6.0</div>
    </div>
    <div class="col-md-9" style="box-sizing: border-box; position:
      relative; min-height: 1px; padding-right: 15px; padding-left:
      15px; float: left; width: 484.984375px; color: rgb(51, 51, 51);
      font-family: Roboto, sans-serif; font-size: 14px; font-style:
      normal; font-variant: normal; font-weight: normal; letter-spacing:
      normal; line-height: 20px; orphans: auto; text-align: start;
      text-indent: 0px; text-transform: none; white-space: normal;
      widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;
      background-color: rgb(51, 51, 51);">
      <table class="center-table CustomTable" style="box-sizing:
        border-box; border-spacing: 0px; border-collapse: collapse;
        background-color: transparent; padding: 0px; color: rgb(170,
        170, 170); display: table; width: 454px;">
        <tbody style="box-sizing: border-box;">
          <tr style="box-sizing: border-box;">
            <td style="box-sizing: border-box; padding: 5px 15px 5px
              5px; border-bottom-width: 1px; border-bottom-style: solid;
              border-bottom-color: rgb(170, 170, 170); text-align:
              left;"><br>
            </td>
            <td style="box-sizing: border-box; padding: 5px 15px 5px
              5px; border-bottom-width: 1px; border-bottom-style: solid;
              border-bottom-color: rgb(170, 170, 170); text-align:
              left;">Errors</td>
            <td style="box-sizing: border-box; padding: 5px 15px 5px
              5px; border-bottom-width: 1px; border-bottom-style: solid;
              border-bottom-color: rgb(170, 170, 170); text-align:
              left;">Warnings</td>
          </tr>
          <tr style="box-sizing: border-box;">
            <td style="box-sizing: border-box; padding: 5px 15px 5px
              5px; border-bottom-width: 1px; border-bottom-style: solid;
              border-bottom-color: rgb(170, 170, 170); text-align:
              left;">Baseline TIFF 6.0</td>
            <td class="error" style="box-sizing: border-box; padding:
              5px 15px 5px 5px; color: red; border-bottom-width: 1px;
              border-bottom-style: solid; border-bottom-color: rgb(170,
              170, 170); text-align: left;">2</td>
            <td class="warning" style="box-sizing: border-box; padding:
              5px 15px 5px 5px; color: rgb(255, 153, 0);
              border-bottom-width: 1px; border-bottom-style: solid;
              border-bottom-color: rgb(170, 170, 170); text-align:
              left;">2</td>
          </tr>
        </tbody>
      </table>
    </div>
    <p><br>
    </p>
    <p><br>
    </p>
    <p><br>
    </p>
    <p>                                                               
                                                                     
                                                                     
                                                                     
                                                                     
                                      <br>
    </p>
    <h4 class="bold" style="box-sizing: border-box; font-family: 'Roboto
      Bold', sans-serif; font-weight: 500; line-height: 1.1; color:
      rgb(51, 51, 51); margin-top: 10px; margin-bottom: 10px; font-size:
      18px; font-style: normal; font-variant: normal; letter-spacing:
      normal; orphans: auto; text-align: start; text-indent: 0px;
      text-transform: none; white-space: normal; widows: auto;
      word-spacing: 0px; -webkit-text-stroke-width: 0px;
      background-color: rgb(242, 242, 242);">File structure</h4>
    <table class="CustomTable3 " style="box-sizing: border-box;
      border-spacing: 0px; border-collapse: collapse; background-color:
      white; margin-bottom: 10px; text-align: left; padding: 0px;
      table-layout: fixed; width: 293px; color: rgb(51, 51, 51);
      font-family: Roboto, sans-serif; font-size: 14px; font-style:
      normal; font-variant: normal; font-weight: normal; letter-spacing:
      normal; line-height: 20px; orphans: auto; text-indent: 0px;
      text-transform: none; white-space: normal; widows: auto;
      word-spacing: 0px; -webkit-text-stroke-width: 0px;">
      <tbody style="box-sizing: border-box;">
        <tr style="box-sizing: border-box;">
          <th style="box-sizing: border-box; padding: 5px 5px 5px 15px;
            text-align: left; background-color: rgb(51, 51, 51); color:
            rgb(211, 211, 211);">Elements</th>
        </tr>
        <tr style="box-sizing: border-box;">
          <td style="box-sizing: border-box; padding: 5px 10px 5px 15px;
            word-wrap: break-word;">
            <ul id="structure" style="box-sizing: border-box; margin:
              0px; list-style-type: none; padding: 0px 0px 0px 25px;">
              <li style="box-sizing: border-box; padding-top: 5px;"><a
                  id="liifd0" class="" style="box-sizing: border-box;
                  background-color: transparent; color: rgb(51, 122,
                  183); text-decoration: none;"><span
                    class="Apple-converted-space"> </span>IFD0 -
                  Thumbnail</a>
                <ul style="box-sizing: border-box; margin: 0px;
                  list-style-type: none; padding: 0px 0px 0px 25px;">
                  <li style="box-sizing: border-box; padding-top: 5px;"><span
                      class="Apple-converted-space"> </span><a
                      id="lisub0" class="bold" style="box-sizing:
                      border-box; background-color: transparent; color:
                      rgb(51, 122, 183); text-decoration: none;
                      font-family: 'Roboto Bold', sans-serif;">SubIFD -
                      Main image</a></li>
                </ul>
              </li>
            </ul>
          </td>
        </tr>
      </tbody>
    </table>
    <h4 class="bold" style="box-sizing: border-box; font-family: 'Roboto
      Bold', sans-serif; font-weight: 500; line-height: 1.1; color:
      rgb(51, 51, 51); margin-top: 10px; margin-bottom: 10px; font-size:
      18px; font-style: normal; font-variant: normal; letter-spacing:
      normal; orphans: auto; text-align: start; text-indent: 0px;
      text-transform: none; white-space: normal; widows: auto;
      word-spacing: 0px; -webkit-text-stroke-width: 0px;
      background-color: rgb(242, 242, 242);">Conformance checker</h4>
    <div class="row bot20 fullw" style="box-sizing: border-box;
      margin-right: -15px; margin-left: -15px; margin-bottom: 20px;
      width: 940px; color: rgb(51, 51, 51); font-family: Roboto,
      sans-serif; font-size: 14px; font-style: normal; font-variant:
      normal; font-weight: normal; letter-spacing: normal; line-height:
      20px; orphans: auto; text-align: start; text-indent: 0px;
      text-transform: none; white-space: normal; widows: auto;
      word-spacing: 0px; -webkit-text-stroke-width: 0px;
      background-color: rgb(242, 242, 242);">
      <div class="clexpert" style="box-sizing: border-box; float: right;
        margin-top: 15px;"><label for="checkInfo1" style="box-sizing:
          border-box; display: inline-block; max-width: 100%;
          margin-bottom: 5px; font-weight: bold; -webkit-user-select:
          none; cursor: pointer;"><span style="box-sizing: border-box;
            display: inline-block; width: 19px; height: 19px; margin:
            -1px 0px 0px; vertical-align: middle; background-image:
url(file:///C:/Users/arnold/DPF%20Manager/reports/20200213/3/html/img/check_radio_sheet.png);
            cursor: pointer; background-position: 0% 0%;
            background-repeat: no-repeat no-repeat;"></span><span
            class="Apple-converted-space"> </span>Show infos</label></div>
      <div style="box-sizing: border-box;">
        <h5 class="bold left15" style="box-sizing: border-box;
          font-family: 'Roboto Bold', sans-serif; font-weight: 500;
          line-height: 1.1; color: inherit; margin-top: 10px;
          margin-bottom: 10px; font-size: 15px; margin-left: 15px;"><span
            class="Apple-converted-space"> </span>Baseline TIFF 6.0</h5>
        <table class="CustomTable3 left15" style="box-sizing:
          border-box; border-spacing: 0px; border-collapse: collapse;
          background-color: white; margin-bottom: 10px; text-align:
          left; padding: 0px; table-layout: fixed; width: 940px;
          margin-left: 15px;">
          <tbody style="box-sizing: border-box;">
            <tr style="box-sizing: border-box;">
              <th class="bold tcenter" style="box-sizing: border-box;
                padding-top: 5px; padding-right: 5px; padding-bottom:
                5px; padding-left: 0px !important; text-align: center
                !important; font-family: 'Roboto Bold', sans-serif;
                background-color: rgb(51, 51, 51); color: rgb(211, 211,
                211); width: 50px;">Type</th>
              <th class="bold" style="box-sizing: border-box; padding:
                5px; text-align: left; font-family: 'Roboto Bold',
                sans-serif; background-color: rgb(51, 51, 51); color:
                rgb(211, 211, 211); width: 120px;">ID</th>
              <th class="bold" style="box-sizing: border-box; padding:
                5px; text-align: left; font-family: 'Roboto Bold',
                sans-serif; background-color: rgb(51, 51, 51); color:
                rgb(211, 211, 211); width: 80px;">Location</th>
              <th class="bold" style="box-sizing: border-box; padding:
                5px; text-align: left; font-family: 'Roboto Bold',
                sans-serif; background-color: rgb(51, 51, 51); color:
                rgb(211, 211, 211);">Description</th>
            </tr>
            <tr data-toggle="popover" title="" data-content="An Image
              File Directory(IFD) that contains and image data must have
              a X Resolution value&lt;br&gt;&lt;i&gt;TIFF Baseline 6:
              Section 3: Bilevel Images. Page 21
              TIFF Baseline 6: Section 4: Grayscale Images. Page 22
              TIFF Baseline 6: Section 5: Palette-color Images. Page 23
              TIFF Baseline 6: Section 6: RGB Full Color Images. Page
              23&lt;/i&gt;" data-placement="auto bottom"
              data-trigger="hover" data-original-title="An image IFD
              must have a X Resolution value" style="box-sizing:
              border-box;">
              <td class="bold tcenter" style="box-sizing: border-box;
                padding-top: 5px; padding-right: 10px; padding-bottom:
                5px; padding-left: 0px !important; font-family: 'Roboto
                Bold', sans-serif; text-align: center !important;
                word-wrap: break-word;"><br>
              </td>
              <td style="box-sizing: border-box; padding: 5px 10px 5px
                5px; word-wrap: break-word;">IFDI-0004</td>
              <td style="box-sizing: border-box; padding: 5px 10px 5px
                5px; word-wrap: break-word;">IFD1</td>
              <td style="box-sizing: border-box; padding: 5px 10px 5px
                5px; word-wrap: break-word;">Image IFD must have tag X
                Resolution</td>
            </tr>
            <tr data-toggle="popover" title="" data-content="An Image
              File Directory(IFD) that contains and image data must have
              a Y Resolution value&lt;br&gt;&lt;i&gt;TIFF Baseline 6:
              Section 3: Bilevel Images. Page 21
              TIFF Baseline 6: Section 4: Grayscale Images. Page 22
              TIFF Baseline 6: Section 5: Palette-color Images. Page 23
              TIFF Baseline 6: Section 6: RGB Full Color Images. Page
              23&lt;/i&gt;" data-placement="auto bottom"
              data-trigger="hover" data-original-title="An image IFD
              must have a Y Resolution value" style="box-sizing:
              border-box;">
              <td class="bold tcenter" style="box-sizing: border-box;
                padding-top: 5px; padding-right: 10px; padding-bottom:
                5px; padding-left: 0px !important; font-family: 'Roboto
                Bold', sans-serif; text-align: center !important;
                word-wrap: break-word;"><br>
              </td>
              <td style="box-sizing: border-box; padding: 5px 10px 5px
                5px; word-wrap: break-word;">IFDI-0005</td>
              <td style="box-sizing: border-box; padding: 5px 10px 5px
                5px; word-wrap: break-word;">IFD1</td>
              <td style="box-sizing: border-box; padding: 5px 10px 5px
                5px; word-wrap: break-word;">Image IFD must have tag Y
                Resolution</td>
            </tr>
            <tr data-toggle="popover" title="" data-content="If
              SamplesPerPixel is 1, PlanarConfiguration is irrelevant,
              and need not be included.&lt;br&gt;&lt;i&gt;TIFF Baseline
              6: Section 8: Baseline Field Reference Guide. Page
              38&lt;/i&gt;" data-placement="auto bottom"
              data-trigger="hover"
              data-original-title="PlanarConfiguration requires more
              than one SamplesPerPixel" style="box-sizing: border-box;">
              <td class="bold tcenter" style="box-sizing: border-box;
                padding-top: 5px; padding-right: 10px; padding-bottom:
                5px; padding-left: 0px !important; font-family: 'Roboto
                Bold', sans-serif; text-align: center !important;
                word-wrap: break-word;"><br>
              </td>
              <td style="box-sizing: border-box; padding: 5px 10px 5px
                5px; word-wrap: break-word;">TAG-284-0005</td>
              <td style="box-sizing: border-box; padding: 5px 10px 5px
                5px; word-wrap: break-word;">IFD1</td>
              <td style="box-sizing: border-box; padding: 5px 10px 5px
                5px; word-wrap: break-word;">PlanarConfiguration is
                irrelevant if SamplesPerPixel is 1, and need not be
                included.</td>
            </tr>
            <tr data-toggle="popover" title="" data-content="If
              SamplesPerPixel is 1, PlanarConfiguration is irrelevant,
              and need not be included.&lt;br&gt;&lt;i&gt;TIFF Baseline
              6: Section 8: Baseline Field Reference Guide. Page
              38&lt;/i&gt;" data-placement="auto bottom"
              data-trigger="hover"
              data-original-title="PlanarConfiguration requires more
              than one SamplesPerPixel" aria-describedby="popover273047"
              style="box-sizing: border-box;">
              <td class="bold tcenter" style="box-sizing: border-box;
                padding-top: 5px; padding-right: 10px; padding-bottom:
                5px; padding-left: 0px !important; font-family: 'Roboto
                Bold', sans-serif; text-align: center !important;
                word-wrap: break-word;"><br>
              </td>
              <td style="box-sizing: border-box; padding: 5px 10px 5px
                5px; word-wrap: break-word;">TAG-284-0005</td>
              <td style="box-sizing: border-box; padding: 5px 10px 5px
                5px; word-wrap: break-word;">IFD1</td>
              <td style="box-sizing: border-box; padding: 5px 10px 5px
                5px; word-wrap: break-word;">PlanarConfiguration is
                irrelevant if SamplesPerPixel is 1, and need not be
                included</td>
            </tr>
          </tbody>
        </table>
      </div>
    </div>
    <p>More questions:</p>
    <ul>
      <li>the file structure shown is the inverse of what I would have
        expected</li>
      <li>it does show to images - why don't the Tiff utilities not show
        the same</li>
      <li>DPF manager output refers to 2 error and 2 warning - but the
        Tiff utilities don't.</li>
      <li>Is this due to the different versions? wrong options for the
        Tiff utilities? or ??</li>
      <li>is there a similar Tiff utility which would show the file
        structure? DPF Manager seems a bit overkill just to inspect that
        issue.</li>
    </ul>
    <p>TIA for reading this far and for any pointers or other
      information to help me sort this out.<br>
    </p>
    <p><br>
    </p>
    <p><br>
    </p>
    <p><br>
    </p>
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