Yes, I'm running the latest QTR version. I can also confirm the problem exists on Windows 7 64-bit. On a clean Windows 7 64-bit system I have here, I did a fresh install of the Epson 7900 driver, then a fresh install of QTR. Same results: when printing a 10-ink separation image (which includes the additional Green and Orange channels) in Calibration Mode with QTRGui, there is a pattern of Green ink being printed in what should be white space next to the patches of Orange ink.
I've done some more testing and have now concluded that this is definitely not a hardware issue or corrupted printing pipeline. It's as if the rasterized calibration image being sent to the printer is somehow including Green channel data AFTER any Orange channel patch has been processed during rasterization up until a different object is encountered which uses a different channel.
Also, the corruption in the rasterized image is happening ONLY in the long dimension of the image regardless of orientation of the page. (This tells me that QTR rasterization processing is starting on the short edge of the image [which is printed first] and then continues the length of the image.) See "CalModeIssue2.jpg" which I've just posted in the files section to see what I mean. In this image, I put a row of increasing density Orange patches across the top (short edge) of the page. You can see that the pink Piezoflush (from the Green channel) is printing DOWN in this case compared to CalModeIssue.jpg where it occurred horizontally. But in both cases, the corruption is in the direction of the long dimension of the image.
Furthermore, you can see from CalModeIssue2.jpg that the density of the Green ink corruption is proportional to the density of the Orange patch being printed (rasterized) first. This is even more evidence to me that there is something REALLY strange happening in the rasterization process.
Now, you say this is most likely not affecting printing in normal mode, and my printing so far would support that observation, but this is clearly a bit unnerving. What I conclude so far is:
- Printing a 10-ink separation image to a 10-channel printer in Calibration Mode results in corruption of the image relating to Green and Orange ink channels
- I have not seen any issues when printing 8-channel separation images. It only occurs if the image includes the additional Orange channel.. Even if there is no Green channel ink in the image, the Green channel corruption still occurs.
- The problem has been observed on both Windows 10 64-bit and Windows 7 64-bit installations of QTR using QTRGui. Not known (by me) if this also occurs on MacOS.
- I'm just guessing here (no definitive data yet), but I suspect the problem lies in the rasterization code, possibly not in QTRGui itself.
I'd be happy to assist with any further testing on this if it would help identify and fix the problem. I'd also like to know if this has been observed on MacOS with 10-channel printers in Calibration Mode. A test on MacOS would be the next thing that needs to be done so that we can identify if this is related to OS platform implementation or not.
Thanks, Dave
---In QuadtoneRIP@yahoogroups.com, <roy@...> wrote :
Hi Dave
Are you running the latest QTR driver ? I seem to remember something strange about orange and green
But that was a while back. Unfortunately I don't have a 10 ink printer to test this out. I'm pretty sure
this would not affect ordinary printing.
Roy