Re: [Gimp-print-devel] Gutenprint 5.2.11 [en] for HP Laserjet 4

[Mark B. <mj...@ea...>]

Indeed, I was not clear.  I left all printer settings, and the CUP + 
Gutenprint settings to what should produce light prints. IE, density 
settings left at their lowest setting and a RET setting on the printer 
which I believe should also influence a light print.  The settings made 
in Libreoffice either reflected or I made them to match the system 
settings.  But after your suggestion of color, I applied via Libreoffice 
a grayscale setting to the font and this was the first, very observable 
change in printed density, from dark to very light.  For this to be 
practical, I need to set up a default opening page in Libreoffice which 
incorporates the grayscale of choice, and apparently ignore density 
settings.

I believe that I am correct in stating that setting the grayscale in 
Libreoffice is really a work around for some other problem, and not 
Gutenprint's.  I say that because as I noted previously, I could not get 
light pages to print either from the printer's own test program or from 
the system test program with a low density setting (1 on a scale of 1 to 
5).  I would think that one of those methods would have produced a light 
print.  And for what ever reason, ACAD conveniently can be set to 
produce 4 different  print density outputs?

mark


On 12/28/19 6:42 AM, Robert Krawitz wrote:
> On Fri, 27 Dec 2019 19:20:30 -0800, Mark Bower wrote:
>> Summary/Overview of Findings - Drop to Bottom to see Solution
>>
>> A. Printing a test page from the printer test menu produces only dark prints. (printer settings given below)
>>
>> B. Printing a test page as a system test by accessing the CUPS pop-up, the only change effected was going from 300dpi to 150dpi, in which case the graphic images lightened slightly.
>>
>> C. In ACAD 2000, the plot(print) selection allows settings for something listed as “Screening 25%,50%,75%,100%. Going from 25% to 100% correlates to a light print to dark print. This is the behavior desired.
>>
>> D. Setting the printer settings within Libreoffice to match the system settings used in “B” does produces only a dark print.
>>
>>
>> *Laserjet Settings* (permanent, but can be overridden by cmds sent to the printer as I understand it)
>>
>> Print Menu: RET Light Job Menu: resolution 300x300dpi Config Menu: Density = 1 (1 to 5 range)
>>
>>
>> *Computer System Settings* (CUPS + Gutenprint v5.2.11)
>>
>> Color Model: Grayscale (Grayscale or Inverted Grayscale)
>>
>> Color Precision: Normal
>>
>> Print Quality: Draft (Manual Control, Draft, Standard, High)
>>
>> Resolution: 300 x 300dpi (150,300,600)
>>
>> Color Correction: Density (Default,High Accuracy, Bright Colors, Correct Hue Only, Uncorrected)
>>
>> Density: 1.000 (.100 to 8.00, none)
>>
>>
>> *Libreoffice Settings *
>>
>> same as Computer System Settings
>>
>> So in general, it would seem that Libreoffice (as well as the printer test prints themselves not responding to the low density setting of 1) does not cooperate (while ACAD responds as expected).  But when you requested what is the setting for Color Correction, for whatever reason I went to Libreoffice help, and in that section grayscale was listed, so went to the grayscale discussion and found that I could set levels of grayscale, voila! The path is Tools>Options>Libreoffice>Colors>[edit color]. It shows color and grayscale choices for fonts; my grayscale choice of 5 works, produces a lighter print.  While I have never done it, I believe it is a simple matter to set up a page in Libreoffice with the grayscale parameter and save the page as a default opening page.
>>
>> Thank you for hanging in with me and taking an interest.
> So I don't quite understand exactly what that final test (that worked)
> involved.  Was it only changes to LibreOffice settings, or was it also
> a change to Gutenprint settings?  If you changed both, can you try
> just one at a time to see if you needed to change both or only one
> (and if so, which one)?