[BUG] Unable to convert pdf images to grayscale "invalidBitsPerComponent"

[rcorry]

Description

Following this example from the documentation, an xobject is failing to convert to an image due to an invalid number of bits per component, in this case the error says there are 4. When printing out the value of the ximg.BitsPerComponent I can see the value is actually 8. This results in an error and the pdf is not converted to grayscale.

Expected Behavior

The xobject should be converted to an image and subsequently converted to grayscale before being added back to the pdf.

Actual Behavior

Steps to reproduce the behavior:

1. Run this example code
2. Convert the attached file, passing it in as the first argument
3. See error

Attachments

test.pdf

[github-actions]

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[3ace]

@rcorry Thank you for contacting us about this issue. We'll take a look at it and update you later if we have more info about this.

[ipod4g]

@rcorry The new UniPDF release is out https://github.com/unidoc/unipdf/releases/tag/v3.64.0 could you please test convert pdf images to grayscale?

[ipod4g]

@rcorry I am closing this issue. You can review our solution, and if you continue to experience any problems, feel free to open a new issue here.