[IMAGING-38] Incorrect PhysicalWidthDpi for JPEG image with resolution specified in dots per millimeter

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.97
• Fix Version/s: 1.0-alpha1
• Component/s: Format: JPEG
• Labels: patch

Environment

N/A

• Assignee: Unassigned
• Reporter: Tars Joris
• Created: 20/Mar/12 12:52
• Updated: 03/May/19 08:39
• Resolved: 04/Apr/12 04:47

Description

The value of physical with DPI is incorrect for JPEG images, which express their resolution in dots per millimeter.

Two images are attached:

• example_ppi.jpg: Normal image, with resolution specified in dots per inch (72 pixels/in)
• example_ppmm.jpg: Same image, but with resolution specified in dots per millimeter (2.8 pixels/mm)

When running the attached code, the output is

example_ppi.jpg
getPhysicalWidthDpi: 72
getPhysicalHeightDpi: 72
example_ppmm.jpg
getPhysicalWidthDpi: 11
getPhysicalHeightDpi: 71

While you'd expect the value 71 for getPhysicalWidthDpi for the second image.