8 Bit or 16 bit , sRGB or Pro Photo

Started Sep 11, 2019 | Discussions thread
technoid Senior Member • Posts: 2,277
Re: 8 Bit or 16 bit , sRGB or Pro Photo

Ken60 wrote:

Canon's Pro1000 XPS driver does not print using 16 bits in Windows 10 on my system. And Canon's Print Studio Pro doesn't print 16 bits either even though there is an option that supposedly does that.

After your declaration I posed this question to Canon CPS, asking about the XPS driver and the data sent from the software to the printer. I asked if the data was read as 16 bit into the software , and then sent as 8 bit to the ImagePrograf Pro 1000. I cut and paste the reply from Canon CPS today :-

Thank you for your request and for contacting Canon.

The 16-bit XPS driver will send 16 bit data to the printer when used with a 16 bit capable software such as Adobe Photoshop.

Strange isn't it? I've read similar claims from Canon re the Pro 1000 printing in 16 bits with the xps driver and was looking forward to it since my Epson can't.

I make a number of specialized charts, some of which could benefit from the higher resolution of a higher bit driver. So I was rather disappointed when I tested it and it produced the same banding as the 8 bit driver. Banding that is completely consistent with 8 bit printing.

However, since banding between single rgb steps is not visible,  as gray scale dEs are small and typically less than .5, identifying whether a printer claim to use 16 bits is true requires scanning (or photographing) a gradient print and increasing contrast sufficiently to boost the dEs between bands into visibility.

I posted images of this result in this thread.

On the positive side, given how hard it is to actually test, it's easy to see why printing with 8 bits or 16 bits makes no practical difference in print quality.

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