Issue 1606 in pdfium: Image renders incorrectly in pdf from adobe illustrator file

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aaco… via monorail

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Oct 27, 2020, 6:46:27 PM10/27/20
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Status: Unconfirmed
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Labels: Type-Defect Priority-Medium

New issue 1606 by aaco...@imgix.com: Image renders incorrectly in pdf from adobe illustrator file
https://bugs.chromium.org/p/pdfium/issues/detail?id=1606

What steps will reproduce the problem?
1.View the attached file in Mac preview
2.View the attached file in Chrome

What is the expected output? What do you see instead?
I expect to see no overlap between the yellow and black portions of the image.
I see an extra pixelof the yellow portions overlapping with the black portions.
See attached images for original file and the expected vs chrome views.


What version of the product are you using? On what operating system?
Chrome: Version 86.0.4240.111 (Official Build) (x86_64)
MacOS Catalina: 10.15.6 (19G2021)


Please provide any additional information below.
The file was originally created with adobe illustrator (original file included). It was exported as a pdf from Adobe Illustrator.

Attachments:
exported_ai_file.pdf 197 KB
Expected view.png 58.9 KB
View in Chrome.png 7.0 KB
View in Chrome with defects circled.png 10.6 KB
original ai file.ai 350 KB

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n… via monorail

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Oct 30, 2020, 2:17:31 PM10/30/20
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Updates:
Status: WontFix

Comment #1 on issue 1606 by ni...@chromium.org: Image renders incorrectly in pdf from adobe illustrator file
https://bugs.chromium.org/p/pdfium/issues/detail?id=1606#c1

I opened this PDF in Acrobat and it shows the yellow portions overlapping with black as well. And Acrobat makes the overlapping parts more obvious at a smaller scale (such as 600%). Acrobat can zoom up to 6400% at which you can still see overlapping borders of these two colors, but the overlapping parts are getting thinner.

Using PDFium render this PDF at scale 600% and 6000% shows the same trend and similar rendering results as Acrobat.

On the other hand, Okular and mac Preview show similar rendering results, which you can barely tell there is overlapping.

In my opinion this is a Won't fix. Different PDF viewer might have different choices over how to display thin line and edges especially when optimization for LCD display is often involved.

aaco… via monorail

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Nov 2, 2020, 5:37:10 PM11/2/20
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Comment #2 on issue 1606 by aaco...@imgix.com: Image renders incorrectly in pdf from adobe illustrator file
https://bugs.chromium.org/p/pdfium/issues/detail?id=1606#c2

Thanks for looking into the issue. It is a small issue that we can live with, but we will keep an eye on it in case it ever gets corrected.

It looks correct in Safari and in the preview app on my iMac. When it looked different in Chrome, I thought you should know about it.
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