PDF Export Size / Resolution Inconsistency #33465

Saijin-Naib · 2019-12-18T15:40:59Z

Describe the bug
GeoPDF export products (both ISO3200 and OGC styles) export at a page size that is scaled by a factor above the determined Page Size set in the Layout Manager.

For instance:
Project settings: GeoPDF ISO3200 - ANSI D (34 x 22 inches)

Export @ 150dpi: 70.83 x 45.83 inches

- 2.08 scale factor

Export @ 300dpi: 141.67 x 91.67 inches

- 4.16 scale factor

Project Settings: Legacy PDF - ANSI D (34 x 22 inches)
Export @ 300dpi: 34 x 22 inches

- 1.00 scale factor

How to Reproduce

Set a known page size and export resolution (ANSI D @ 150/300dpi for this example)
Export PDF using GeoPDF variant (ISO3200 or OGC)
Inpsect document properties in PDF viewer
Note that actual page dimensions are scaled above what export was set to
Re-export same document using "Legacy" PDF
Inspect document properties in PDF viewer
Note that actual page dimensions match export settings

QGIS and OS versions

QGIS version	3.10.1-A Coruña	QGIS code revision	`ef24c52`
Compiled against Qt	5.11.2	Running against Qt	5.11.2
Compiled against GDAL/OGR	3.0.2	Running against GDAL/OGR	3.0.2
Compiled against GEOS	3.8.0-CAPI-1.13.1	Running against GEOS	3.8.0-CAPI-1.13.1
Compiled against SQLite	3.29.0	Running against SQLite	3.29.0
PostgreSQL Client Version	11.5	SpatiaLite Version	4.3.0
QWT Version	6.1.3	QScintilla2 Version	2.10.8
Compiled against PROJ	6.2.1	Running against PROJ	Rel. 6.2.1, November 1st, 2019
OS Version	Windows 10 (10.0)
Active python plugins	CalculateGeometry; DataPlotly; joinmultiplelines; latlontools; MemoryLayerSaver; networks; openlayers_plugin; PluginLoadTimes; processing_gnm; qconsolidate; QGISSortAndNumber-master; realcentroid; refFunctions; SelectWithin; SplitPolygonShowingAreas; SpreadsheetLayers; statist; db_manager; processing

Additional context
Seems to be the same issue as Issue #32931

Attachment
This attachment contains a sample QGIS project, as well as sample export PDFs, and screenshots for the settings used to generate each set of export PDFs.
PDF_TEST.7z.zip

The text was updated successfully, but these errors were encountered:

nyalldawson · 2020-06-05T04:57:13Z

I can't reproduce this -- using the attached project the generated PDFs are all correctly sized...

Saijin-Naib · 2020-06-05T05:04:23Z

Still happening with the test project:

Is this a limitation of the outdated GDAL/QT shipped against the Windows build compared to what some can run on Linux?

QGIS version	3.12.3-București	QGIS code revision	`8234261`
Compiled against Qt	5.11.2	Running against Qt	5.11.2
Compiled against GDAL/OGR	3.0.4	Running against GDAL/OGR	3.0.4
Compiled against GEOS	3.8.1-CAPI-1.13.3	Running against GEOS	3.8.1-CAPI-1.13.3
Compiled against SQLite	3.29.0	Running against SQLite	3.29.0
PostgreSQL Client Version	11.5	SpatiaLite Version	4.3.0
QWT Version	6.1.3	QScintilla2 Version	2.10.8
Compiled against PROJ	6.3.2	Running against PROJ	Rel. 6.3.2, May 1st, 2020
OS Version	Windows 10 (10.0)
Active python plugins	CalculateGeometry; ImageServerConnector; MemoryLayerSaver; openlayers_plugin; slyr; SpreadsheetLayers; vector_tiles_reader; zoom_level; db_manager; processing

nyalldawson · 2020-06-15T03:09:15Z

I suspect the difference here is in how Adobe Reader interprets the page size vs the PDF reader I'm using...

Saijin-Naib · 2020-06-15T03:45:15Z

I suspect the difference here is in how Adobe Reader interprets the page size vs the PDF reader I'm using...

Hm, locally these files show the same (wrong) size in GSView, Foxit, and Adobe. And by locally I mean on my work and personal computers, both.

agiudiceandrea · 2020-06-16T06:46:25Z

If it can help, inspecting the provided pdf files you will find:
Legacy_150DPI.pdf
<< /Annots 14 0 R /Contents 11 0 R /MediaBox [ 0 0 2448 1584 ] /Parent 3 0 R /Resources 13 0 R /Type /Page /VP [ 27 0 R ] >>

Legacy_300DPI.pdf
<< /Annots 14 0 R /Contents 11 0 R /MediaBox [ 0 0 2448 1584 ] /Parent 3 0 R /Resources 13 0 R /Type /Page /VP [ 27 0 R ] >>

ISO3200_150DPI.pdf
<< /Contents 3213 0 R /Group << /CS /DeviceRGB /S /Transparency /Type /Group >> /MediaBox [ 0 0 2448 1584 ] /Parent 1 0 R /Resources 3214 0 R /StructParents 0 /Type /Page /UserUnit 2.083333333333333 /VP [ 12 0 R 15 0 R ] >>

ISO3200_300DPI.pdf
<< /Contents 3213 0 R /Group << /CS /DeviceRGB /S /Transparency /Type /Group >> /MediaBox [ 0 0 2448 1584 ] /Parent 1 0 R /Resources 3214 0 R /StructParents 0 /Type /Page /UserUnit 4.1666666666666661 /VP [ 12 0 R 15 0 R ] >>

As you can see, the MediaBox values (in default user space units) are the same (2448 1584), but for ISO3200_150DPI.pdf and ISO3200_300DPI.pdf a UserUnit value is also present.
This value (A positive number that shall give the size of default user space units, in multiples of 1⁄72 inch Default value: 1.0, user space unit is 1⁄72 inch ) represents a scale factor for the real page size: 2.0833 for ISO3200_150DPI.pdf and 4.1667 for ISO3200_300DPI.pdf.

So, the page size for
Legacy_150DPI.pdf and Legacy_300DPI.pdf is 34 x 22 inches (2448*1/72=34 x 1584*1/72=22),
while for
ISO3200_150DPI.pdf is 70.83 x 45.83 inches (2448*2.0833/72=70.83 x 1584*2.0833/72=45.83)
and for
ISO3200_300DPI.pdf is 141.67 x 91.67 inches (2448*4.1667/72=141.67 x 1584*4.1667/72=91.67)

agiudiceandrea · 2020-06-16T08:55:02Z

Moreover, I cannot see any geospatial information for the provided pdf (OGC or ISO3200 ones) using the Geospatial Location Tool in Adobe Reader XI.

agiudiceandrea · 2020-06-17T09:15:25Z

See also "[Qgis-user] Exporting a GeoPDF through Map Layout outputs a larger page size format"

Saijin-Naib · 2020-06-17T09:43:26Z

Is the over-scale output expected and part of the GeoPDF spec?

agiudiceandrea · 2020-06-17T09:49:52Z

I don't think so. For example, ArcMap 9.3.1 exports a correct size GeoPDF for whatever resolution the user wants.

nyalldawson · 2020-09-22T02:53:04Z

I've attempted to fix this, but am blocked by https://lists.osgeo.org/pipermail/gdal-dev/2020-September/052681.html -- it's possible there's an underlying GDAL bug at play here. Will report back any updates...

Saijin-Naib · 2020-09-22T04:12:47Z

Thanks for looking into this!

…file Doing so causes incorrect page sizes for the generated PDF file. Refs qgis/QGIS#33465

original layout DPI This fixes the incorrect page size reported by Acrobat reader for generated GeoPDF files. Unfortunately it comes with a side-effect of limiting the resolution at which GDAL will read the GeoPDF files as a raster layer, but of the two issues the page size issue is more critical. Fixes qgis#33465

original layout DPI This fixes the incorrect page size reported by Acrobat reader for generated GeoPDF files. Unfortunately it comes with a side-effect of limiting the resolution at which GDAL will read the GeoPDF files as a raster layer, but of the two issues the page size issue is more critical. Fixes #33465

Saijin-Naib added the Bug Either a bug report, or a bug fix. Let's hope for the latter! label Dec 18, 2019

gioman added the Print Layouts Related to QGIS Print Layouts, Atlas or Reporting frameworks label Dec 18, 2019

nyalldawson added the Feedback Waiting on the submitter for answers label Jun 5, 2020

nyalldawson mentioned this issue Jun 8, 2020

When exporting to GeoPDf, the page size is set incorrectly. #32931

Closed

gioman removed the Feedback Waiting on the submitter for answers label Jun 12, 2020

nyalldawson mentioned this issue Jun 15, 2020

False page format at creation as Geo-PDF #37188

Closed

domlysz mentioned this issue Jul 3, 2020

Export to standard pdf always rasterize vectors elements #37563

Closed

nyalldawson added a commit to nyalldawson/gdal that referenced this issue Sep 23, 2020

[pdf] Don't write user units when generating GeoPDF from composition …

d48f6f6

…file Doing so causes incorrect page sizes for the generated PDF file. Refs qgis/QGIS#33465

nyalldawson mentioned this issue Sep 23, 2020

[pdf] Don't write user units when generating GeoPDF from composition file OSGeo/gdal#2961

Closed

nyalldawson mentioned this issue Oct 22, 2020

[geopdf] Hardcode a DPI of 72 into GDAL GeoPDF composition file instead of original layout DPI #39547

Merged

nyalldawson closed this as completed in #39547 Oct 22, 2020

nirvn mentioned this issue Jan 31, 2021

[gdal] Add open options support to gain dataset flexibility / fixes #41277

Merged

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PDF Export Size / Resolution Inconsistency #33465

PDF Export Size / Resolution Inconsistency #33465

Saijin-Naib commented Dec 18, 2019 •

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nyalldawson commented Jun 5, 2020

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Saijin-Naib commented Sep 22, 2020

PDF Export Size / Resolution Inconsistency #33465

PDF Export Size / Resolution Inconsistency #33465

Comments

Saijin-Naib commented Dec 18, 2019 • edited

nyalldawson commented Jun 5, 2020

Saijin-Naib commented Jun 5, 2020 • edited

nyalldawson commented Jun 15, 2020

Saijin-Naib commented Jun 15, 2020 • edited

agiudiceandrea commented Jun 16, 2020 • edited

agiudiceandrea commented Jun 16, 2020

agiudiceandrea commented Jun 17, 2020

Saijin-Naib commented Jun 17, 2020

agiudiceandrea commented Jun 17, 2020

nyalldawson commented Sep 22, 2020

Saijin-Naib commented Sep 22, 2020

Saijin-Naib commented Dec 18, 2019 •

edited

Saijin-Naib commented Jun 5, 2020 •

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Saijin-Naib commented Jun 15, 2020 •

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agiudiceandrea commented Jun 16, 2020 •

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