50138140: Mac OS X 10.14.4: PrinterProxy crashes when saving a scanned document

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Description

Summary:

The scan assistant crashes when scanning a document.

Steps to Reproduce:

1. Open the « Printers and scanners » preference pane
2. Clic on the « Scan » tab and open the Scan assistant
3. Wait for the preview to be scanned
4. Select the whole document area, select « PDF » as the output format, and click on « Scan »

Expected Results:

The scanned document is saved as a PDF file.

Actual Results:

The progress bar appears, and the document is scanned–but when the progress bar reaches the end, the app closes suddenly, and no document is saved.

Regression:

This used to work with the same scanner on macOS 10.14.3

Notes:

• Tested on a Samsung M2070 Series scanner
• Same crash occurs when using PNG as the target format
• Same crash occurs when opening PrinterProxy from the Preview app
• Same crash occurs when using either Wifi or USB to connect to the scanner
• Error logs produces these messages:

error 20:15:17.891636 +0200 PrinterProxy CGImageCreate: invalid image bits/component: 8 bits/pixel 24 alpha info = kCGImageAlphaNoneSkipLast default 20:15:17.903351 +0200 PrinterProxy -[IKScan savePDFJPEGPage:toPDFURL:]: unrecognized selector sent to instance 0x7fd858434920

Log attached.

- Product Version: macOS 10.14.4 Created: 2019-04-23T18:40:21.445331 Originated: 2019-04-23T00:00:00 Open Radar Link: http://www.openradar.me/50138140