Extracting ITPC data from JPG

[Mark fleming]

Using MediaExtractor v2.4.2
And console application for dotNet Code v3.1

Using extracted sample code from:
https://github.com/drewnoakes/metadata-extractor-dotnet/tree/master/MetadataExtractor.Samples

The JpegMetadataReader correctly read the metadata, but IJpegSegmentMetadataReader[] using new IptcReader() fails to find ITPC data (code shown below).

File I am using to test is::

`

Using JpegMetadataReader

[JPEG] Compression Type - Baseline
[JPEG] Data Precision - 8 bits
[JPEG] Image Height - 500 pixels
[JPEG] Image Width - 1000 pixels
...
[JPEG] Component 3 - Cr component: Quantization table 1, Sampling factors 1 horiz/1 vert

[Exif IFD0] Image Description - The description aka caption (ref2019.1)
[Exif IFD0] X Resolution - 72 dots per inch
[Exif IFD0] Y Resolution - 72 dots per inch
[Exif IFD0] Resolution Unit - Inch
[Exif IFD0] Artist - Creator1 (ref2019.1)
[Exif IFD0] YCbCr Positioning - Center of pixel array
[Exif IFD0] Copyright - Copyright (Notice) 2019.1 IPTC - www.iptc.org (ref2019.1)

[XMP] XMP Value Count - 246

[IPTC] Object Attribute Reference - A Genre (ref2019.1)
[IPTC] Object Name - The Title (ref2019.1)
[IPTC] Subject Reference - IPTC:1ref2019.1 IPTC:2ref2019.1 IPTC:3ref2019.1
[IPTC] Keywords - Keyword1ref2019.1;Keyword2ref2019.1;Keyword3ref2019.1
[IPTC] Special Instructions - An Instruction (ref2019.1)
[IPTC] Date Created - 2019:10:16
[IPTC] Time Created - 19:01:00+0000
[IPTC] By-line - Creator1 (ref2019.1)
[IPTC] By-line Title - Creator's Job Title (ref2019.1)
[IPTC] City - City (Core) (ref2019.1)
[IPTC] Sub-location - Sublocation (Core) (ref2019.1)
[IPTC] Province/State - Province/State (Core) (ref2019.1
[IPTC] Country/Primary Location Code - R19
[IPTC] Country/Primary Location Name - Country (Core) (ref2019.1)
[IPTC] Original Transmission Reference - Job Id (ref2019.1)
[IPTC] Headline - The Headline (ref2019.1)
[IPTC] Credit - Credit Line (ref2019.1)
[IPTC] Source - Source (ref2019.1)
[IPTC] Copyright Notice - Copyright (Notice) 2019.1 IPTC - www.iptc.org (ref2019.1)
[IPTC] Caption/Abstract - The description aka caption (ref2019.1)
[IPTC] Caption Writer/Editor - Description Writer (ref2019.1)
[IPTC] Application Record Version - 4

[Adobe JPEG] DCT Encode Version - 25600
..
[Adobe JPEG] Color Transform - YCbCr

[Huffman] Number of Tables - 4 Huffman tables

[File] File Name - IPTC-PhotometadataRef-Std2019.1.jpg
[File] File Size - 128691 bytes
[File] File Modified Date - Fri May 29 22:34:33 -04:00 2020

-- End -- SCENARIO 2: SPECIFIC FILE TYPE

`

        // APPROACH 3: SPECIFIC METADATA TYPE
        //
        // If you only wish to read a subset of the supported metadata types, you can do this by
        // passing the set of readers to use.
        //
        try
        {
            // Handle only Exif and IPTC from JPEG
            IJpegSegmentMetadataReader[] readers = new IJpegSegmentMetadataReader[] { new ExifReader(), new IptcReader() };
            IJpegSegmentMetadataReader[] readersIPTC = new IJpegSegmentMetadataReader[] {  new IptcReader() };

            var directories = JpegMetadataReader.ReadMetadata(filePath, `readers);`
            Print(directories, "\nUsing JpegMetadataReader for Exif and IPTC only ----");

            var directoriesITPC = JpegMetadataReader.ReadMetadata(filePath, `readersIPTC);`
            Print(directoriesITPC, "\nUsing JpegMetadataReader for  IPTC only ----");
        }
        catch (JpegProcessingException e)
        {
            PrintError(e);
        }
        catch (IOException e)
        {
            PrintError(e);
        }

`

Produces the following -- with not ITPC Data.
`

Using JpegMetadataReader for Exif and IPTC only ----

[Exif IFD0] Image Description - The description aka caption (ref2019.1)
[Exif IFD0] X Resolution - 72 dots per inch
[Exif IFD0] Y Resolution - 72 dots per inch
[Exif IFD0] Resolution Unit - Inch
[Exif IFD0] Artist - Creator1 (ref2019.1)
[Exif IFD0] YCbCr Positioning - Center of pixel array
[Exif IFD0] Copyright - Copyright (Notice) 2019.1 IPTC - www.iptc.org (ref2019.1)

[File] File Name - IPTC-PhotometadataRef-Std2019.1.jpg
[File] File Size - 128691 bytes
[File] File Modified Date - Fri May 29 22:34:33 -04:00 2020

---

Using JpegMetadataReader for IPTC only ----

[File] File Name - IPTC-PhotometadataRef-Std2019.1.jpg
[File] File Size - 128691 bytes
`

[Drew Noakes]

That image has IPTC data buried within the Photoshop segment. To get at it, you'll want to include MetadataExtractor.Formats.Photoshop.PhotoshopReader as an IJpegSegmentMetadataReader.

[Mark fleming]

Thank you.