[Dev-luatex] LuaTeX 1.10.0 cannot embed properly PDFs with 4-bit images

L. E. Segovia amy at amyspark.me
Wed Dec 4 03:31:22 CET 2019


I would like to report that since TeX Live 2019, LuaTeX is unable to 
embed properly a certain type of image I have.
These sort of images are embedded in the PDFs generated by the tool 
"Comprobantes en línea" of Argentina's IRS (Administración Federal de 
Ingresos Públicos, https://www.afip.gob.ar).

This is an example: 
(or just search online for the string "Esta Administración Federal no se 
responsabiliza por los datos ingresados en el detalle de la operación").

Embed this file using the following snippet:



Where the white-and-grey AFIP logo appears in the original, LuaTeX 
instead embeds a grey-on-grey image, probably by messing with the alpha 

I have consistently reproduced this on every update since the 2019 
release. XeLaTeX and pdfTeX do not have this issue.

Please let me know if I can be of more assistance. I hope I've posted to 
the right mailing list.

Best regards,


Leonardo E. Segovia

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