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[DIY DTG] New Gimp White Underbase with 3 Color Composite Printing

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Old October 2nd, 2011 Oct 2, 2011 7:32:47 PM -   #1 (permalink)
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Default New Gimp White Underbase with 3 Color Composite Printing

Hey Team! I just finished programming the Gutenprint definition files for the 1100 and 1400 to allow printing a white under-base with 3 color composite. It has been altered to print four passes of each color. This should lay down a sufficient amount of ink to make a good print. This is experimental and no warranties are explicit or implied. I don't believe it can cause any harm to your printer. Give it a try and see if it fits your needs.

On the 1100 replace both black with white.

On the 1400 replace the black, light cyan and light magenta with white.

http://diydtg.wikispaces.com/Gimp+Co...White+Printing

Post your experience here...

Thanks,

Bob ?;O)
 
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Old October 2nd, 2011 Oct 2, 2011 8:03:33 PM -   #2 (permalink)
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Default Re: New Gimp White Underbase with 3 Color Composite Printing

I would like to know how it works. Do I need to make a file for white image and another for the cmy, print the white first and then the cmy after it?

Or just click print one time and it will send two printing jobs to the printer?

Thanks
 
Old October 2nd, 2011 Oct 2, 2011 8:27:29 PM -   #3 (permalink)
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Default Re: New Gimp White Underbase with 3 Color Composite Printing

Quote:
Originally Posted by johndako
I would like to know how it works. Do I need to make a file for white image and another for the cmy, print the white first and then the cmy after it?

Or just click print one time and it will send two printing jobs to the printer?

Thanks
I'm working on a howto... To answer your question, yes. You need to create two files. One for the white on black and another for the color to print over that white background...

Bob ?;O)
 
 
Old October 2nd, 2011 Oct 2, 2011 9:57:09 PM -   #4 (permalink)
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Default Re: New Gimp White Underbase with 3 Color Composite Printing

The howto is complete...

http://diydtg.wikispaces.com/Gimp+Co...White+Printing

Please let me know what you think...

PS... I currently have Gutenprint printing four passes of each color. It was set at two by default so I'm guessing four will lay down twice as much ink...

Thanks,

Bob ?;O)

Last edited by colorfinger; October 2nd, 2011 at 10:09 PM..
 
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Old October 2nd, 2011 Oct 2, 2011 10:14:56 PM -   #5 (permalink)
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Default Re: New Gimp White Underbase with 3 Color Composite Printing

Awesome Bob!! I'll give it a try tomorrow and let you know.
Did you have to create a new printer driver file, or just add a new printer in the xmls?
Thanks
 
Old October 2nd, 2011 Oct 2, 2011 10:21:03 PM -   #6 (permalink)
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Default Re: New Gimp White Underbase with 3 Color Composite Printing

Quote:
Originally Posted by estrada
Awesome Bob!! I'll give it a try tomorrow and let you know.
Did you have to create a new printer driver file, or just add a new printer in the xmls?
Thanks
Luis, there are a couple of the XML files that I had to mess with. One, the inks and two the models. There are other things we could do but we need to make sure we are on the right track... So far I'm impressed with the flexibility of the software. I have it set so that it will always lay down the largest drops possible. This should help preclude any clogging. I suspect we might have some tweaking to do but believe we are on the right track here. Next step is to create a plugin that will make the under-print and separate it from the image and send them one at a time to Gutenprint.

Bob ?;O)
 
Old October 2nd, 2011 Oct 2, 2011 10:40:19 PM -   #7 (permalink)
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Default Re: New Gimp White Underbase with 3 Color Composite Printing

Have you actually printed on a black shirt? Once I tried printing on a white shirt that had a black strip in the middle, the PW sensor interpreted it as the end of the front paper guide, so it would not print beyond that point. From what I read in the developers manual, we could disable the PW sensor from the printer driver file, but it would requiere diggin a bit into it and of course recompiling the whole thing, but I guess you are already recompiling everything, right?
 
Old October 2nd, 2011 Oct 2, 2011 10:46:15 PM -   #8 (permalink)
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Default Re: New Gimp White Underbase with 3 Color Composite Printing

If you turn edge to edge printing off you should not need to worry about the PW sensor. It will print fine from my experience. If I remember, I put a piece of metal tape over the PW sensor and didn't think twice about it. Let me know how it goes. I have never printed on a black shirt... yet.

Bob ?;O)
 
Old October 2nd, 2011 Oct 2, 2011 10:57:05 PM -   #9 (permalink)
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Default Re: New Gimp White Underbase with 3 Color Composite Printing

Quote:
Originally Posted by colorfinger
If you turn edge to edge printing off you should not need to worry about the PW sensor.

Bob ?;O)
Do you mean activate the Borderless option? Because I do not see any "edge printing" option. Thanks.
 
Old October 3rd, 2011 Oct 3, 2011 7:38:35 AM -   #10 (permalink)
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Default Re: New Gimp White Underbase with 3 Color Composite Printing

Quote:
Originally Posted by estrada
Do you mean activate the Borderless option? Because I do not see any "edge printing" option. Thanks.
I think we mean to deactivate the borderless option..

Bob ?;O)
 
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Old October 3rd, 2011 Oct 3, 2011 11:38:40 PM -   #11 (permalink)
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Default Re: New Gimp White Underbase with 3 Color Composite Printing

Bob, have you printed with the 3 color composite already? I have printed some designs, but I do not like the colors. Black looks more like a very dark green. Compared to CMYK printing, there is a huge difference in color quality. Have you experienced this?
 
Old October 4th, 2011 Oct 4, 2011 12:56:50 AM -   #12 (permalink)
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Default Re: New Gimp White Underbase with 3 Color Composite Printing

Bob this is a break through DIY DTG + Free GutenPrint RIP equalize High Price Commercial DTG + High Price RIP
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Old October 4th, 2011 Oct 4, 2011 7:11:27 AM -   #13 (permalink)
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Default Re: New Gimp White Underbase with 3 Color Composite Printing

Quote:
Originally Posted by estrada
Bob, have you printed with the 3 color composite already? I have printed some designs, but I do not like the colors. Black looks more like a very dark green. Compared to CMYK printing, there is a huge difference in color quality. Have you experienced this?
We may have to do some tweaking to the profile to get it right... Did you print a white under-base? My new 1100 is still in the box. I haven't ripped into it yet so I don't currently have a working build... I'm working on a totally new design which will dramatically depart from the direction DTG has been going. I'm doing allot of prep-work right now.

This idea for Gutenprint was burning in my head so I decided to knock it out to make it available. I will spend more time working on it in the near future. So, the composite will need some work. Got it. Thanks for the feedback. Now, is anyone else getting the same experience? I'll pull it out of the box this weekend and take a look-see.

How was the density? Did it take much longer to print with 4 passes instead of 2? Could you post some pics?

Bob ?;O)

Last edited by colorfinger; October 4th, 2011 at 08:54 AM..
 
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Old October 4th, 2011 Oct 4, 2011 8:20:55 AM -   #14 (permalink)
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Default Re: New Gimp White Underbase with 3 Color Composite Printing

Luis,

This might be an easy fix... In Gutenprint:

1) Select the Output tab.
2) Click on the grey box that says "Adjust Output"
3) Activate the "Magenta" and bump it up a bit... Keep trying till you get a good black. Please let us know what value you settle on.

I hope this helps.

Bob ?;O)
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File Type: jpg output.jpg (50.2 KB, 196 views)
File Type: jpg Adjust.jpg (120.0 KB, 208 views)

Last edited by colorfinger; October 4th, 2011 at 08:52 AM..
 
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Old October 4th, 2011 Oct 4, 2011 10:20:39 AM -   #15 (permalink)
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Default Re: New Gimp White Underbase with 3 Color Composite Printing

Ok, I'll give it a try. The problem might be when printing photograph with people faces, the magenta will over saturate those areas don't you think? Before you start disasembly of your printer, I recomend you try printing an image in both composite and 4 color standard. In paper you would be able to see the difference more clearly. I haven't tested the underbase yet, but I will dig into it now. I'll let you know.
 
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