drewnoakes/metadata-extractor

Identify thumbnail offset and length tags by name

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#263 opened on Mar 31, 2017

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bugformat-exifhelp wanted

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Description

After recent changes, these two tags are displayed as unknown.

(From #262):

[Exif SubIFD] - New Subfile Type = Reduced-resolution image
[Exif SubIFD] - Compression = JPEG (old-style)
[Exif SubIFD] - X Resolution = 300 dots per inch
[Exif SubIFD] - Y Resolution = 300 dots per inch
[Exif SubIFD] - Resolution Unit = Inch
[Exif SubIFD] - Unknown tag (0x0201) = 1080832
[Exif SubIFD] - Unknown tag (0x0202) = 1737279
[Exif SubIFD] - YCbCr Positioning = Datum point

0x0201 is thumbnail offset, and 0x0202 is thumbnail length.

Contributor guide

Research direction
Locate where Exif SubIFD tags are defined and add entries for tags 0x0201 (ThumbnailOffset) and 0x0202 (ThumbnailLength) with their proper names.
Tech stack
java
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Java
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75