[BUG] Grayscale transformation corrupts some PDFs

[dillonkh]

Description

This may not actually be a bug, but im hoping to at least get some help on this issue im facing.
Im using the grayscale example to transform a pdf to grayscale. When i open the resulting pdf i get the message An error exists on this page. Acrobat may not display the page correctly. Please contact the person who created the PDF document to correct the problem. and the pdf indeed does not display correctly.

Expected Behavior

Popular PDF viewers such as Acrobat should be able to render PDFs that have been transformed to grayscale

Actual Behavior

Steps to reproduce the behavior:

1. $ cd unipdf-examples/advanced
2. copy trouble pdf to directory
3. $ go run pdf_grayscale_transform.go sample-pdf-file.pdf gray.pdf
4. open gray.pdf in adobe acrobat

Attachments

Trouble PDF (color): sample-pdf-file.pdf
Trouble PDF (grayscale): gray.pdf

Acrobat Error Message:

Acrobat PDF Render:

[3ace]

Hi @dillonkh

Thank you for reaching out regarding this matter. We will promptly review the issue and provide an update upon any developments.