BUG: When exporting a PDF file as a PNG containing an Opacity Mask made with a 1-Bit tif file AND Anti-Alias turned off in the PNG Export options does not render correctly. The opacity mask is not WYSIWYG in the exported PNG file. The PNG file contains part of the mask information (from left to right).

The same issue occurs when opening the same PDF file in Adobe Photoshop. If the Anti-aliasing is turned off the resulting PNG is incorrect (although the thumbnail in the PDF import screen IS correct.

If Anti-aliasing is turned ON in either scenario the resulting PNG is WYSIWYG.

We need PNG files without Anti-aliased edges that match their PDF counterparts.

Fig A PDF screenshot

Fig B PNG export from AI PDF file & when imported into PSD (anti-aliasing OFF)

Fig C PNG export from AI PDF file & PNG created when imported into PSD (anti-aliasing ON)

DETAILS:
Mac OS 10.12.6
AI 22.1