For historical reasons the maximum paper size of a PDF is 200x200 inches or 14400x14400 pts.
If DPI is wrong (as if often the case) img2pdf may generate a PDF longer than 200 inches.
For example if image is 28800 pixels wide and DPI is set to 72, img2pdf will calculate a width of 400 inches and create an illegal PDF with these dimensions. Some PDF viewers will display it but compliant ones (Acrobat) will not.
In PDF 1.6 you can set /UserUnit on the /Page object to adjust the size of 1 pt. In my example if /UserUnit is 400/200=2.0 then the page dimensions will display correctly.
Or the quick and dirty approach is to manipulate the DPI. If page width > 200, force DPI = pixel width / 200.
Hrm... I think the right way to fix this is to just disallow pages larger than 200 inches in either dimension. I don't see a situation in which allowing larger sizes would be useful.
Thanks for your bugreport!
By jbarlow83 on 2016-02-10T08:00:04.637Z
While I do have map rolls physically larger than 200", my uses are not typical, and most of the time I run into this problem it's a large file with the wrong DPI set. Chances are good that 200 inches is an error condition and aborting is reasonable.
By josch on 2016-02-10T08:44:21.914Z
thanks, fixed!
By josch on 2016-02-10T08:44:21.989Z
Status changed to closed
*By jbarlow83 on 2015-03-25T23:46:30.341Z*
For historical reasons the maximum paper size of a PDF is 200x200 inches or 14400x14400 pts.
If DPI is wrong (as if often the case) img2pdf may generate a PDF longer than 200 inches.
For example if image is 28800 pixels wide and DPI is set to 72, img2pdf will calculate a width of 400 inches and create an illegal PDF with these dimensions. Some PDF viewers will display it but compliant ones (Acrobat) will not.
In PDF 1.6 you can set /UserUnit on the /Page object to adjust the size of 1 pt. In my example if /UserUnit is 400/200=2.0 then the page dimensions will display correctly.
Or the quick and dirty approach is to manipulate the DPI. If page width > 200, force DPI = pixel width / 200.
See page 148 for /UserUnit.
https://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/pdf_reference_1-7.pdf
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*By josch on 2016-02-10T06:23:59.033Z*
---
Hrm... I think the right way to fix this is to just disallow pages larger than 200 inches in either dimension. I don't see a situation in which allowing larger sizes would be useful.
Thanks for your bugreport!
---
*By jbarlow83 on 2016-02-10T08:00:04.637Z*
---
While I do have map rolls physically larger than 200", my uses are not typical, and most of the time I run into this problem it's a large file with the wrong DPI set. Chances are good that 200 inches is an error condition and aborting is reasonable.
---
*By josch on 2016-02-10T08:44:21.914Z*
---
thanks, fixed!
---
*By josch on 2016-02-10T08:44:21.989Z*
---
Status changed to closed
By jbarlow83 on 2015-03-25T23:46:30.341Z
For historical reasons the maximum paper size of a PDF is 200x200 inches or 14400x14400 pts.
If DPI is wrong (as if often the case) img2pdf may generate a PDF longer than 200 inches.
For example if image is 28800 pixels wide and DPI is set to 72, img2pdf will calculate a width of 400 inches and create an illegal PDF with these dimensions. Some PDF viewers will display it but compliant ones (Acrobat) will not.
In PDF 1.6 you can set /UserUnit on the /Page object to adjust the size of 1 pt. In my example if /UserUnit is 400/200=2.0 then the page dimensions will display correctly.
Or the quick and dirty approach is to manipulate the DPI. If page width > 200, force DPI = pixel width / 200.
See page 148 for /UserUnit.
https://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/pdf_reference_1-7.pdf
By josch on 2016-02-10T06:23:59.033Z
Hrm... I think the right way to fix this is to just disallow pages larger than 200 inches in either dimension. I don't see a situation in which allowing larger sizes would be useful.
Thanks for your bugreport!
By jbarlow83 on 2016-02-10T08:00:04.637Z
While I do have map rolls physically larger than 200", my uses are not typical, and most of the time I run into this problem it's a large file with the wrong DPI set. Chances are good that 200 inches is an error condition and aborting is reasonable.
By josch on 2016-02-10T08:44:21.914Z
thanks, fixed!
By josch on 2016-02-10T08:44:21.989Z
Status changed to closed