use `lpr` to print hardcopies

TL;DR: lpr -p -o EPIJ_Silt=1 -o Resolution=720x720dpi -o EPIJ_Qual=307 ./lpoptoins.pdf

Use lpoptions -l to show custom options for printer, such as EPIJ_Qual/Print Quality: 308 311 *303 309 304 305 306 307.

Note that only EPIJ_Qual is used in printing option e.g. lpr -o EPIJ_Qual=308, the text after / is an short description of the option.

Example output of lpoptions -l

$ lpoptions -l
...
EPIJ_Ink_/Grayscale: *1 0
EPIJ_Qual/Print Quality: 308 311 *303 309 304 305 306 307
ColorModel/ColorModel: *RGB Mono
Resolution/Resolution: 180x180dpi *360x360dpi 720x720dpi
PageSize/Media Size: *A4 EPKG EPKG.NMgn EPPhotoPaper2L A6 A5 B5 B6 EPPhotoPaperLRoll EPPhotoPaperLRoll.NMgn EPIndexCard5x8 EP8x10in EPHiVision102x180 EPHiVision102x180.NMgn EPPostcard100x148 EPPostcard100x148.NMgn Env10 EnvDL EnvC6 Letter EP216x330mm EPIndianLegal Legal EP16K195x270mm Custom.WIDTHxHEIGHT
EPIJ_Silt/Quiet Mode: *0 1
...

upzip /Library/Printers/PPDs/Contents/Resources/EPSON\ ET-2810\ Series.gz to ~/Documents/downloads/ read the mearning of options.

Run the following command in the unzipped downloads folder

$ cat EPSON\ ET-2820\ Series | grep Qua
...
*EPIJ_Qual 308/Draft: ""
*EPIJ_Qual 311/Draft-Vivid : ""
*EPIJ_Qual 303/Normal: ""
*EPIJ_Qual 309/Normal-Vivid: ""
*EPIJ_Qual 304/Fine: ""
*EPIJ_Qual 305/Quality: ""
*EPIJ_Qual 306/High Quality: ""
*EPIJ_Qual 307/Best Quality: ""
...