Pizza is currently certified at Master level.

Name: Solomon Peachy
Member since: 2001-10-04 19:49:21
Last Login: 2014-02-20 04:23:15

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Homepage: http://www.shaftnet.org/users/pizza

Notes:

A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, pitch manure, solve equations, analyze a new problem, program a computer, cook a tasty meal, fight efficiently, die gallantly.
Specialization is for insects.

-- Robert A. Heinlein, "The Notebooks of Lazarus Long"

Currently residing in sunny Melbourne, Florida, I'm employed by AbsoluteValue Systems to write 802.11 network drivers for Linux and other miscellaneous embedded-type stuffs.

My main passion these days is photography; here is the portal to it all.

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Recent blog entries by Pizza

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The current state of the Mitsubishi CP-D70DW, CP-D707DW, CP-K60DW-S, and CP-D80DW printers under Linux

The problem:

Over the last month or so, I've received on average two questions a week about these printers, mostly along the same lines of "I can't print with them, help!"

The short answer

They don't work with Linux, and this isn't likely to change anytime soon.

The longer answer

With the Mitsubishi CP-D70 and D707, If you use the Gutenprint 5.2.11-cvs code later than August 14, and the backend code from at least October 4, you will be able to successfully generate prints. The CP-K60 still won't print at all due to incomplete knowledge about printer backend protocol, and I have not seen what changes the CP-D80 incorporates.

Unfortunately, while the CP-D70 and D707 are able to successfully print, the output is all screwed up. The Windows drivers perform non-linear color scaling that requires gamma correction; this is annoying but would be straightforward to figure out, except the drivers are also doing some sort dithering.

How bad is this dithering? A test job with six nominal colors results in a printjob that contains over 18,000 (16-bit) color values. Even a simple "print a page with a single, pure color" job results in dozens (if not hundreds) of colors as the driver adjusts the intensity according to some unknown algorithm.

The pithy answer

Mitsubishi actually wrote Linux drivers for all of these (and other!) printers, but only provides them as part of their Kiosk solutions, not for normal end-users. So, don't reward manufacturers that snub Linux users, and support those who do.

The alternative answer

There are many competitive alternatives (both price-wise and performance-wise) which have solid support under Linux. In particular, here's what I'd recommend if you want a kiosk-class, workhorse photo printer:

  • DNP DS40, RX1, or DS80
  • Citizen CX, CX-W, or CY
  • Shinko S2145 / Sinfonia S2
  • Kodak 6800, 6850, or 605
  • Sony UP-DR150 or UP-DR200

Several other models from these manufacturers should (in theory) work okay, but the above represents a known-good list. Note the utter lack of any Mitsubishi models; as of this writing, none of their printers play well with Linux.

The pleading answer

In case anyone over at Mitsubishi is reading this, how about tossing me some documentation and a printer or three to play with? Proper Linux support will only help you sell more printers!

Syndicated 2014-11-22 13:35:03 from Solomon Peachy

30 Oct 2014 (updated 22 Nov 2014 at 14:13 UTC) »

Further printer work

Okay, so I guess I was wrong about additional printer hacking. Despite the 12-hour days at the office over the past few weeks (we got our first silicon back, and software is the ring that binds everything together in the darkness), I'm still spending time writing code when I get home.

First, I added support for the Sony UP-CR10L and its rebadged bretheren, the DNP SL10. I've had these on my to-do list for a while; I'd already decoded everything and updated the existing UP-DR150/200 backend to handle the new bits, but never got around to adding proper support into Gutenprint. That's now done, and once I get the USB PIDs, it should JustWork(tm).

Beyond that, I've knocked out a few things on the bug list. One I just fixed affected pipelined printingon the DNP/Citizen printers, and it was most easily triggered by multi-page print jobs. With Gutenprint 5.2.10's backend, the printer would just abort the job after the first page, but if you were using a development snapshot after 2014-06-04, it would automatically retry the job, resulting in an endless printing of page 1 over and over again.

The bug was due to the backend mistakenly treating the "Printing, with one available buffer for a 300dpi or small 600dpi job" status as an error.

...Oops.

At least folks won't have to wait for the next Gutenprint release to pick up the latest backend code.

I have a rather large photo backlog from the past month to sort through. That will be my weekend project..

Syndicated 2014-10-30 02:38:37 (Updated 2014-11-22 14:13:15) from Solomon Peachy

Shinko/Sinfonia printers

I just committed initial support for the Shinko/Sinfonia CHC-S1245, CHS-S6145, and CHC-S6245 into Gutenprint. They use printjob structures similar to the S2145, and appear to share the same basic driver core, so the odds are high that the existing S2145 backend will work with only minor changes.

So, if there's anyone out there with one of those models (or better yet, some low-level documentation on their communication protocol) drop me a note, and from there we should be able to get things working pretty quickly.

There's still the CHC-S8145 and the DP-1045 to sort out, but those are for another time.

I think that's it for printer hacking for a while, barring bugfixes and the ongoing Mitsubishi CP-D70/D707/K60 saga. Testers needed...

Syndicated 2014-10-20 03:49:50 from Solomon Peachy

More dyesub printer work

The Citizen CW-01 is now confirmed working, and the necessary code has been committed into Gutenprint. With luck, the next release will take less than two years! This should also work with the Olmec OP-900, but I'll need a USB ID in order to add that to the backend.

Meanwhile, I just committed initial support for the Kodak 305 and Kodak 8810 printers to Gutenprint. It's unknown if they need an intelligent backend, but I suppose time will tell. As always, testers welcome.

Here's my current to-do list:

  • Kodak 8800, 7000/7010/7015, and D4000
  • Mitsubishi CP-D80DW and CP-9600DW
  • Shinko S1245, S6145/S6145-5A, S5245, S8145, and DP-1045
  • Sony UP-CR10L and UP-CR20L (aka DNP SL-10 and SL-20)

These models need USB IDs:

  • Citizen CW-02, OP900, OP900-II
  • Mitsubishi CP-3800DW

These models need testing:

  • Mitsubishi CP-3020D/DA/DE/DAE, CP-9550D/DW, and CP-9810D/DW
  • Kodak 8500, 9180, 8810, and 305

I've received inquires about various HiTi models, but without access to the printers (or at least complete USB sniffs of print generation with specific settings logged) I won't be able to make any progress. Their windows spool format is some sort of (compressed!) intermediate language rather than something that's natively dumped to the printer.

Finally, the Mitsubishi CP-D70/D707/K60 remain problematic; despite a lot of work on the backend we're no closer to figuring out the necessary color scaling/dithering the windows drivers employ so the color output from Gutenprint is pretty lousy.

This isn't how I'd intended to spend my Friday night. With luck the fever will finally break tonight so I can get out and about tomorrow..

Syndicated 2014-10-18 03:33:18 from Solomon Peachy

Further adventures with printers: The Citizen CW-01

A few days ago, someone with a Citizen CW-01 popped up on the Gutenprint mailing list. Due to its lineage, I'd assumed it (and its bretheren, the OP900) was related to the newer CW and CY families, and would work with the DS40 backend once the USB PID was known.

It turns out that the printer operates at 334dpi natively, so some additional work was needed. I'm not sure how I'd missed that. So, after some decoding of the WinXP print jobs, I discover the spool format is quite simple, and looks nothing like the newer CX/CY series.

So I ask the user to obtain some sniffs of the printer comms, and he delivered two dumps that look quite similar to the CX/CY, differing only in a couple of parameters.

So, it was pretty easy to whip up a new backend. It's out for testing now, and with luck, in a few days I'll be able to declare the CW-01 as officially supported by Gutenprint, so it'll work under Linux.

It'll be a bit more work to figure out how much of the CX/CY's status/info command set works with the CW-01, and I suspect the 600dpi support needs some more work, but for now, it's out of my hands.

In other news, another Mitsubishi CP-D70DW user popped up, sent me some detailed sniffs, and let me remote into his system for some interactive debugging; many, many bugfixes to the backend later, and it seems to be handle everything I know how to throw at it. With luck it'll also fix the CP-K60DW functionality as well.

Unfortunately, the CP-D70/D707/K60 employ a seriously screwy nonlinear tone curve/smoothing approach that I haven't been able to model, so Gutenprint's output is pretty lousy. Such is the fate of reverse-engineering efforts..

Syndicated 2014-10-07 03:13:17 from Solomon Peachy

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