Free metadata assistant software for linux

Directory Assistant is an application for managing an LDAP address book. The focus is to create a very easy to use program, with only the few but necessary features. The target of Directory Assistant is novice users that still need to keep their addresses in an LDAP server.

QA Assistant is a Gnome-Python application that assists a reviewer in performing quality assurance. It displays a checklist that the reviewer fills in.
When the checklist is filled, the application outputs a review to a file for the reviewer to submit. In addition to the GUI interface, the application features an XML checklist definition for extensibility, the ability to add custom checklist items to a review, and an informational tips interface to aid in filling out the review.
Enhancements:
- This development release includes several major changes from 0.4.90.3.
- Checks ensure that required properties have been entered.
- The menus have been switched to gtk.uimanager.
- Checklist function files can now inlcude code that utilizes uimanager to add new menu and toolbar items.

This is a small application allowing you to scan for wireless networks and connect to them.
Wireless Assistant uses wireless-tools as its backend, so they need to be installed.
All feedback as well as hints and good advice are appreciated!
Installation:
make -f Makefile.cvs
./configure
make
su -c "make install"
Enhancements:
- NOTE: This release includes some brand new or rewritten features. Please submit bugs to sf.net page and comments/votes here. Thanks!
- NEW: Finally WPA-PSK support (WPA/WPA2, please test and report in case of problems!)
- NEW/FIX: Rewritten, completely new connection state detection (please comment!)
- NEW: Optional grouping of APs with the same ESSID
- FIX: UI refinements
- FIX: hide encryption keys in console output and edit dialogs
- FIX: Connection using dhclient fails
- FIX: dont check for connection while wizard is running
- FIX: remove default gateway upon disconnection if not managed by DHCP client
- FIX: updated Polish translation (with help from riklaunim)
- FIX: Many internal changes, more stable

GNU Privacy Assistant aka GPA, is a graphical user interface for the GnuPG (GNU Privacy Guard).

GPA utilizes GTK (the GIMP Tool Kit) and compiles for various platforms. You can have a look at some screenshots . You can learn more about GPA icons , as well.

Hachoir metadata can extract metadata from archives (bzip2, gzip, zip, tar), audio (MPEG audio/MP3, WAV, Sun/NeXT audio, Ogg/Vorbis, MIDI, AIFF, AIFC, Real Audio), images (BMP, CUR, EMF, ICO, GIF, JPEG, PCX, PNG, TGA, TIFF, WMF, XCF), and video (ASF/WMV, AVI, Matroska, Quicktime, Ogg/Theora, Real Media).
It supports invalid or truncated files and Unicode text. It can remove duplicate values. Hachoir metadata project can also filter metadata according to priority.
Main features:
- Support invalid / truncated files
- Unicode compliant (charset ISO-8859-XX, UTF-8, UTF-16), convert string to your terminal charset
- Remove duplicate values (and if a string is a substring of another, just keep the longest one)
- Set priority to value, so its possible to filter metadata (option --level)
- Only depends on hachoir-parser (and not on libmatroska, libmpeg2, libvorbis, etc.)
Enhancements:
- This release reads the number of channels, bit rate, and sample rate, and computes the compression rate of Real Audio.
- It reads user comments of JPEG pictures.
- It computes the frame rate of Windows ANI.
- It normalizes language for ID3 and MKV.
- OLE2 and FLV extractors are now fault tolerant.

Image::MetaData::JPEG::TagLists contains a collection of tag tables for JPEG segments. Image::MetaData::JPEG::TagLists is an appendix to the main manual page of the Image::MetaData::JPEG module, which the reader should refer to for further details and the general scope.

Valid tags for Exif APP1 data

The Japan Electronics and Information Technology Industries Association (JEITA) set up a standard for an exchange format for digital still cameras pictures, known as Exif. This standard defines a structure for embedding meta-data in a JPEG picture, to be written in the APP1 segment. The generalities and the reference documents about this structure are introduced in the Structure appendix; this section and its subsections list the valid interoperability record tags as well as their format.

Canonical Exif 2.2 and TIFF 6.0 tags for IFD0 and IFD1

In general, IFD0 and IFD1 can host tags from the same set. These tags are divided in three categories: canonical, additional and registered to companies. The tags listed in the following table are to be considered canonical; they are described at length in the Exif standard document, and can be found both in the IFD0 and in the IFD1 (some of them, in fact, must be present in both directories).

The class column carries the tag class; possible values are: A (image data structure), B (offsets), C (image data characteristics), D (other tags) and P (pointers to other IFDs). The two following columns show tag hexadecimal codes and names. The type column specifies the (always unsigned) tag type: I (short or long), S (short), L (long), R (rational) and A (ASCII, always null terminated). The count column obviously carries the tag count (- for a variable count, either because it is a variable length string or because it depends on other tags).

The IFD0 and IFD1 columns specify the support level in the respective directory; each column comprises four letters, because both the primary image (IFD0) and the thumbnail (IFD1) can come in four varieties (uncompressed chunky, uncompressed planar, uncompressed YCC and JPEG compressed).

This module currently focuses only on JPEG pictures (not TIFF), so only the fourth letter of the IFD0 column is interesting, but note that the thumbnail of a JPEG image can be uncompressed. The support level codes stand for: M (mandatory), R (recommended), O (optional), N (not_recorded) and J (included in JPEG marker and so not recorded).

The thumbnail-only column shows a T for those records which cannot be set/changed by the user exception made during a thumbnail update action (and some of them are calculated automatically anyway). Note that, in some cases, it is possible to set a tag when its support level is N (e.g., the YCbCr stuff in IFD1): picture displaying programs should however simply ignore it. Some other tags, concerning offsets or thumbnail specific information, cannot be set by the module user (they are calculated automatically, more reliably): these are marked by calculated in the notes, or by a T in the thumbnail-only column.

Hexadecimal code count IFD0 IFD1 thumbnail-only
class | Tag name type | supp.supp.| notes
| | | | | | | | |
A 100 ImageWidth I 1 MMMJ MMMJ T (not JPEG) pixels/row
A 101 ImageLength I 1 MMMJ MMMJ T (not JPEG) num. rows
A 102 BitsPerSample S 3 MMMJ MMMJ T (not JPEG) 8,8,8
A 103 Compression S 1 MMMJ MMMM T 1(uncompr.) or 6(JPEG)
A 106 PhotometricInterpretation S 1 MMMN MMMJ 2(RGB) or 6(YCbCr)
D 10e ImageDescription A - RRRR OOOO (see note 1)
D 10f Make A - RRRR OOOO camera manufacturer
D 110 Model A - RRRR OOOO camera model
B 111 StripOffsets I - MMMN MMMN calculated
A 112 Orientation S 1 RRRR OOOO (see note 2)
A 115 SamplesPerPixel S 1 MMMJ MMMJ T (not JPEG) 3 compon.
B 116 RowsPerStrip I 1 MMMN MMMN T (not JPEG)
B 117 StripByteCounts I - MMMN MMMN T (not JPEG)
A 11a XResolution R 1 MMMM MMMM (see note 3)
A 11b YResolution R 1 MMMM MMMM (see note 3)
A 11c PlanarConfiguration S 1 OMOJ OMOJ (see note 4)
A 128 ResolutionUnit S 1 MMMM MMMM (see note 3)
C 12d TransferFunction S 768 RRRR OOOO (see note 5)
D 131 Software A - OOOO OOOO Exif software/firmware
D 132 DateTime A 20 RRRR OOOO (see note 6)
D 13b Artist A - OOOO OOOO owner/photogr./creator
C 13e WhitePoint R 2 OOOO OOOO (see note 5)
C 13f PrimaryChromaticities R 6 OOOO OOOO (see note 5)
B 201 JPEGInterchangeFormat L 1 NNNN NNNM calculated
B 202 JPEGInterchangeFormatLength L 1 NNNN NNNM T (only JPEG)
C 211 YCbCrCoefficients R 3 NNOO NNOO (see note 7)
A 212 YCbCrSubSampling S 2 NNMJ NNMJ (see note 7)
A 213 YCbCrPositioning S 1 NNMM NNOO (see note 7)
C 214 ReferenceBlackWhite R 6 OOOO OOOO (see note 8)
D 8298 Copyright A - OOOO OOOO of photogr./editor
P 8769 ExifOffset L 1 MMMM OOOO calculated
P 8825 GPSInfo L 1 OOOO OOOO calculated