Home > color management, DMI Workshop, Links, Pre-Press > Lost in the world of linearization and process color screen printing

Lost in the world of linearization and process color screen printing

Hi friends,

Sorry I could not post any news articles since last week because too many R&D is simultaneously taking place at Grafica and DMI.

1. The EPSON 9900 and POLIRIP

Linearized of Epson 9900 Inkjet Printer is completed with the help of transmission densitometer. Now 50% dot in file is 50% on film (output). Thereafter linearized film were exposed using 4 different screens (with same tension, mesh count) and printed with process color (CMYK) UV inks. While printing the test chart all press condition and parameters were noted to make sure the same conditions are kept in production to get consistent results. High quality PU sharpened squeegee were used to print 100 sheets.

Production screens were used to expose 6 test strips (with dot percentage ranging from 1% dot to 99%), 3 on the top and 3 on the bottom. Full length (30″ x 40″) sheets were used on a the press with 42″ of squeegee length to record press gain. Never take a smaller squeegee to measure the press gain using a smaller test strip and smaller screen to save money or else you will get a huge difference in dot gain.

Finally last 5 sheets were taken to measure the press dot gain to averaged the numbers. Press dot gain was compensated directly into the RIP. There after a high resolution image along with linearization test strips was printed again to check everything is linear.

While sampling all parameters were kept the same and fantastic result was achieved in the first trail itself. There was minor 5% to 6% gain in mid-tones which I re-corrected by editing the same press dot gain compensation setup file.

One major problem solved that now when ever we receive any AI, CDR, PDF, EPS files from customers we need not correct for press linearization using any image editing software the RIP now takes care of all linearization process (positive as well as press). Press dot gain compensation was a big problem in ready embedded files earlier when we use to outsource our positives with various service providers because we had to spent lot of time compensating dot gain in Photoshop earlier by exporting image in TIFF format keeping text in vector so that it overprints all CMY colors.

So in house RIP facility has one big advantage that now we are able compensate press dot gain for a particular ink and substrate thus not to bother about PDF, EPS, TIFF files etc. Directly open in the RIP load any TIFF, EPS, PS, JPEG, PDF files or print the artwork from illustrator, Corel, ID etc. using the print command selecting Epson printers setup file.


I have also solved the moire issue and you shall not have moire in screen printing even with 100 LPI. No visual angling of positives on screen to eliminate moire pattern.

For complete program details and content kindly contact Ashwini on 9920755561 or email us at marketing@graficaindia.com. She will fix your personalized training program dates.

2. UV Meter development is almost completed and my team is working on standardization of assembly of each parts and we have given it at a very sophisticated lab for calibration to ensure our reading is perfect as per standards.

3. NANO-PRINT my dream project and a dream machine for every screen printers is rocking 3 months 100 machines sold. We have taken another batch of 200 new machines in production. My team is working on accessories related to NANO-PRINT but its a big surprise and I will announce soon. So wait and watch for the BLAST in this HOT SUMMER…

Have a great weekend.


  1. murtaza kapadia
    April 12, 2010 at 11:27 am

    bravo,keep the good work
    thanx murtaza kapadia


    • April 13, 2010 at 7:45 pm

      Thanks and checkout the new CS5 it’s cool awesome




  2. rahul k
    April 17, 2010 at 8:25 pm

    great informative blog.
    we have epson 9880 with wasatch rip and an oven(all for a diff business).
    we are not offset printers but get it done on 24×36 machine.
    typically we have very short runs. was thinking about using polijet for offset.
    do you think it is possible on our setup?
    i read somewhere that polirip is just a re=branded diff rip. so if wasatch rip can be used (it has half toning capablities)
    or if it is not possible, where can we get polijet films processed?
    we are mumbai based. you can contact me artbhai@yahoo.com


    • April 20, 2010 at 9:48 pm

      Hi Rahul,

      Sorry for my late reply in fact Abhay from Technova who sells Polirip have already replied you but any way let give you my frank opinion.

      I have used couple of RIPs and done extensive research in terms of features and to get a user friendly feel which I got only using POLIRIP.

      Every printer must have their own problems and what we had was very easily solved with POLIRIP. The problem we had was outputing our moire gaurd films in other RIPs available for Epson which is a typical issue for any screen printer.

      The second was to get linearization both for device as well as press and this was quite easy feature of PR.

      And last but not the least was to convert profiles from input files which has embedded ICC profiles.

      There are certain great features of PR like to find out ink coverage to get our exact costing of inks based on our inks consumption analysis plus trapping features, cool tone to get replica proofs of our prints based on dots. Also to trap critical cut color jobs automatically.

      In fact i can say that if in screen printing we are comfortable and satisfied than I am sure as a offset printer you shall have no problems using PR.

      Regarding re-branding issue you can contact Technova Mr. Abhay Kasture he shall answer your query better.

      Till today I have found PR to be the most user friendly RIP. Even m students learnt to use it in just couple of hours believe me. Also note that I am not selling PR so I am not answering based on any interest of earning.

      It’s just my hobby to experiment and help printers in our industry

      Good night



  3. April 19, 2010 at 11:43 am

    This is Abhay from TechNova. Since you already have the set up we would like to test the Polijet/Posijet plates & films at our end. We would also carry our software at our end.
    You can then compare the print qulaity of Wascth & PoliRip software.

    It is not an re-branded Rip. We have designed the Rip keeping in mind Offset & Screen printers. We can give you a through demo of our PosiJet & PoliJet media’s.
    Please get in touch with me my cell no: 9820166604, I will be happy to assist.



  1. No trackbacks yet.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: