Printer resolution

Discussion in 'General Technical Discussion' started by Iliah, Sep 16, 2005.

  1. Iliah

    Iliah

    Jan 29, 2005
    nowhere
    Here are some small test grids (100 x 100 pixels) to test it. This test is to determine what is the optimal resolution of the file you are sending to print. I can generate other exotic resolutions, like 304.5, upon request :)

    You can print each of them without any resampling, as-is, setting your printer resolution to 1440 dpi in the driver. Lines are spaced exactly 1 pixel apart, and have exactly 1 pixel width. The names of the files indicate ppi (pixels per inch) of the contents.

    http://www.pochtar.com/grids/1grid144.tif
    http://www.pochtar.com/grids/1grid180.tif
    http://www.pochtar.com/grids/1grid240.tif
    http://www.pochtar.com/grids/1grid288.tif
    http://www.pochtar.com/grids/1grid300.tif
    http://www.pochtar.com/grids/1grid360.tif
    http://www.pochtar.com/grids/1grid720.tif
     
  2. MontyDog

    MontyDog

    Jan 30, 2005
    #1064 - You have an error in your SQL syntax;
     
  3. Iliah

    Iliah

    Jan 29, 2005
    nowhere
    Dear Paul,

    May I have a look at the file and testing methodics?
     
  4. MontyDog

    MontyDog

    Jan 30, 2005
    #1064 - You have an error in your SQL syntax;
     
  5. Iliah

    Iliah

    Jan 29, 2005
    nowhere
    Dear Paul,

    Have you looked at resolution in those files in Photoshop? It seems to me that they were generated from some vector application like Corel, which is not managing resolution correctly. Or resampling was done inaccuratly.
     
    Last edited by a moderator: Sep 16, 2005
  6. MontyDog

    MontyDog

    Jan 30, 2005
    #1064 - You have an error in your SQL syntax;
     
  7. Iliah

    Iliah

    Jan 29, 2005
    nowhere
    I just use Adobe Illustrator. If you want bigger grid, tell me the dimensions, and I will change the file. After that you can open it with Photoshop, setting the resolution you want.
     
  8. MontyDog

    MontyDog

    Jan 30, 2005
    #1064 - You have an error in your SQL syntax;
     
  9. Iliah

    Iliah

    Jan 29, 2005
    nowhere
  10. MontyDog

    MontyDog

    Jan 30, 2005
    #1064 - You have an error in your SQL syntax;
     
  11. This will come in handy, thanks.
     
  12. cwilt

    cwilt

    Apr 24, 2005
    Denver, CO
    Stupid question....

    Then what? Crop to 4"x6" and make prints at different resolutions?

    What should I be looking for?

    I have my dunce cap on.
     
  13. Iliah

    Iliah

    Jan 29, 2005
    nowhere
    Dear Charles,
    Yes, you can open this file at different resolutions, crop and print. The highest resolution where the grid will have no moire, banding, etc.; and the intersections and voids have good square shape is the "true" colour resolution of the printer.
     
  14. cwilt

    cwilt

    Apr 24, 2005
    Denver, CO
    Thanks Iliah. :smile:
     
  15. MontyDog

    MontyDog

    Jan 30, 2005
    #1064 - You have an error in your SQL syntax;
     
    Last edited by a moderator: Sep 17, 2005
  16. Iliah

    Iliah

    Jan 29, 2005
    nowhere
    Dear Paul, try 288 and 144, please. Add some gradients to see if the tone is continuous and full. Look through loupe. 300dpi is myth for most of inkjets. It is not an even multiplier of nozzle pitch. The whole point of this test is to give a tool to check some misconceptions spread way too widely. The file at 300 prints OK, if there are no moire-generating patterns. And printing at 300 dpi you actually sacrifice the sharpness of the print. The problem occurs because printer driver makes an uncontrolled resampling.
     
    Last edited by a moderator: Sep 17, 2005
  17. cwilt

    cwilt

    Apr 24, 2005
    Denver, CO
    So far I have tested 180 and 240 with poor results on my R1800. This is what I normally print with. Time to change my printing work flow. Again.

    Maybe I will print it with Qimage and see if it shows a difference since it is supposed to produce optimal results.
     
  18. Iliah

    Iliah

    Jan 29, 2005
    nowhere
    Dear Charles,

    Qimage is a good thing, but IMHO it can't substitute proper resolution settings in a source file
     
  19. cwilt

    cwilt

    Apr 24, 2005
    Denver, CO
    288 worked fine on the R1800.

    The only problem I have is when printing borderless it (epson drivers) always stretch the image on one side. Does anyone want to clue me in on a way around that?
     
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