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Author Topic: QU Print to file TIFF 16bit or 8bit?  (Read 286 times)
DdeGannes
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« on: November 27, 2018, 02:33:17 PM »

I am using QU on my iMac through Parallels and wish to print to file as a tiff 16bit. Is this possible?
Windows 10 via Parallels on macOS 10.14.1 Mojave.
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DdeGannes
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« Reply #1 on: December 05, 2018, 09:41:33 AM »

I am using QU on my iMac through Parallels and wish to print to file as a tiff 16bit. Is this possible?
Windows 10 via Parallels on macOS 10.14.1 Mojave.

Any one know if itís possible to print to file 16 bit tiff from QU??
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COMP EQP: iMac 27" mid 2015 5K Retina macOS 10.14.1, 24GB Ram; Canon InkJet Pro9000; Scan Elite 5400 film scr./ MacBk Pro OS-X 10.11.4, 8gbRam
CAMERA EQP: Oly OMD EM-1, Digital Zuiko & OM lenses.
Imaging Apps  PS CC 20; LR Classic CC 8.0 ; Qimage U & One; VueScan.
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« Reply #2 on: December 06, 2018, 08:49:01 AM »

Quote
Any one know if itís possible to print to file 16 bit tiff from QU??
As far as I recall, Windows ptints 8 bit
Fred
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« Reply #3 on: December 06, 2018, 11:13:08 AM »

QU prints 16 bit TIFFs at 8 bits/pixel, 16 bits/region.

What does this mean?  QU is optimized for Windows drivers so it prints 8 bits/pixel whether you are printing to printer or file.  BUT, you can't see individual pixels in a print anyway especially at 600 or 720 PPI, so in regions larger than one pixel, color depth beyond 8 bits/channel are reproduced in the print.  In a 2x2 region (300 or 360 PPI), you already have a 10 bits/channel bit depth (1024 shades instead of 256) and by the time you reach a 16x16 pixel region, you are at 16 bits.  So QU will actually reproduce 16 bit color in every 16x16 pixel region in the print.  For reference, a 16x16 pixel region in a 600 PPI print output is a square region of about two thirds of a millimenter (less than three hundredths of an inch).

Bottom line: when you start with a 16 bit TIFF, PSD, or raw photo, you'll get output indistinguishable from 16 bits/pixel from QU even when printing to standard 8 bit drivers and you won't see any posterization or color banding.  It's basically a way to get 16 bit output while still using standard (8 bit) Windows drivers.

Mike
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DdeGannes
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« Reply #4 on: December 06, 2018, 03:06:38 PM »

My request is about the option ďprint to fileĒ as opposed to print to printer.
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CAMERA EQP: Oly OMD EM-1, Digital Zuiko & OM lenses.
Imaging Apps  PS CC 20; LR Classic CC 8.0 ; Qimage U & One; VueScan.
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« Reply #5 on: December 06, 2018, 05:15:52 PM »

The above applies to both print to file and print to printer.

Mike
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DdeGannes
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« Reply #6 on: December 06, 2018, 09:09:41 PM »

Thanks Mike.
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COMP EQP: iMac 27" mid 2015 5K Retina macOS 10.14.1, 24GB Ram; Canon InkJet Pro9000; Scan Elite 5400 film scr./ MacBk Pro OS-X 10.11.4, 8gbRam
CAMERA EQP: Oly OMD EM-1, Digital Zuiko & OM lenses.
Imaging Apps  PS CC 20; LR Classic CC 8.0 ; Qimage U & One; VueScan.
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