Only just noticed this post, and the reference to my name.
I suspect that what Jim Asman has said (regarding resolution and toner particle size) is accurate.
I'm not entirely clear just what a_card is attempting to do:
- The pseudo-raster image shown is (as far as I can make out) 9rows high, with each row having a width of 38 pixels.
- At a resolution of 600 dots-per-inch, this has a height of 0.015 inch, and width of 0.0633 inch.
- At this size, I don't think you'd see the detail, even under a magnifying glass, for the reasons Jim has stated.
To demonstrate this, I've created a PCL raster image with the above dimensions (each row is packed out to 5 bytes, with the last two bits in each row set to zero), contained in the attached PCL print job file.
The other PCL sequences in the job print this image three times, at different raster resolutions:
- 75 dpi: the printer scales up each raster dot 8 times to produce an image approximately 0.12 inch high by 0.507 inch wide.
- 300 dpi: the printer scales up each raster dot 2 times to produce an image approximately 0.03 inch high by 0.127 inch wide.
- 600 dpi: the printer performs no scaling; the image is approximately 0.015 inch high by 0.0633 inch wide.
Attached are:
- The PCL print job file sample_01.prn (renamed with an extra .txt extension to allow it to be attached in this forum).
- An analysis (sample_01.prn_analysis.txt) of the PCL print job.
- A scan (sample_01_scan.pdf) of the print out produced on my local LaserJet 1320n (and scanned on a LaserJet M475dn).