[PDFBOX-4060] Slow rendering of PDF file with DeviceN jpeg file

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.5, 2.0.8
• Fix Version/s: 2.0.9, 3.0.0 PDFBox
• Component/s: Rendering
• Labels: DeviceN
• Assignee: Andreas Lehmkühler
• Reporter: Tilman Hausherr
• Created: 09/Jan/18 18:57
• Updated: 08/Mar/21 12:07
• Resolved: 08/Mar/21 12:07

Description

(File submitted by Soon Keong Tan on the user mailing list)

There is a large jpeg file (5349 x 3806) that uses a DeviceN colorspace which in turn is based on CMYK. There's some slowness due to the type0 convert function from DeviceN to CMYK, but this is less than 10%. Most time is from converting the CMYK to RGB, one pixel at a time. (Because of the DeviceN colorspace we can't use bulk conversion, which may or may not be faster)

jdk: 1.7.0_72

benchmarks:

(1) 1.8.13 - 1.5 mins
(2) 2.0.5 - 6.18 mins
(3) 2.0.8 - 6.35 mins

Issue Links

• is related to: PDFBOX-5121 Use StringBuilder for key in PDDeviceN.toRGBWithTintTransform()