drewnoakes/metadata-extractor

HEIF image width & image height not correct?

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#569 opened on Feb 22, 2022

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format-heifhelp wantedimage-queue

Description

Hi Drew, I noticed that the HEIF Directory always returns the following:

HEIF - Width - 512 pixels HEIF - Height - 512 pixels

While the actual the EXIF directory returns the proper sizes: Exif SubIFD - Exif Image Width - 4032 pixels Exif SubIFD - Exif Image Height - 3024 pixels

perhaps it is grabbing these, or is something else happening?: Exif IFD0 - Tile Width - 512 Exif IFD0 - Tile Length - 512

Attached a sample HEIC

citron.HEIC.zip

Contributor guide

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.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Javaunderstanding of metadata extraction
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
The HEIF directory returns width and height as 512 pixels, likely due to incorrectly reading Tile Width and Tile Length from Exif IFD0. The actual dimensions are in Exif SubIFD. Investigate the HEIF metadata reading code in the repository, possibly in classes handling HEIF boxes or Exif data. Compare with the correct EXIF reading logic to find where the wrong tags are being used.