==== compatible toners ====
/* Have not tried them yet. But keeping them handy for future. */
* [[https://www.costco.com/hp-206a-toner-cartridge%2c-yellow.product.100696622.html | HP 206A Toner Cartridge, Yellow]] (costco.com)
* [[https://www.costco.com/hp-206a-black-toner-cartridge.product.100696627.html | HP 206A Black Toner Cartridge]] (costco.com)
* [[https://www.costco.com/hp-206a-magenta-toner-cartridge.product.100696600.html | HP 206A Magenta Toner Cartridge]] (costco.com)
==== effect of resolution ====
* Item: Indian passport
* Output: 19 scanned pages, each scanned page consists of 2 pages in the passport.
% du -b passport_dpi_*pdf
6675192 passport_dpi_300.pdf
37585496 passport_dpi_600.pdf
% python
>>> 37585496 / 6675192
5.6306239580824045
>>> import math
>>> math.sqrt(37585496 / 6675192)
2.372893583387676
% pdfimages -list passport_dpi_300.pdf
page num type width height color comp bpc enc interp object ID x-ppi y-ppi size ratio
--------------------------------------------------------------------------------------------
1 0 image 2550 3300 rgb 3 8 jpeg no 6 0 300 300 401K 1.6%
2 1 image 2550 3300 rgb 3 8 jpeg no 11 0 300 300 438K 1.8%
3 2 image 2550 3300 rgb 3 8 jpeg no 16 0 300 300 316K 1.3%
4 3 image 2550 3300 rgb 3 8 jpeg no 21 0 300 300 325K 1.3%
5 4 image 2550 3300 rgb 3 8 jpeg no 26 0 300 300 320K 1.3%
6 5 image 2550 3300 rgb 3 8 jpeg no 31 0 300 300 323K 1.3%
7 6 image 2550 3300 rgb 3 8 jpeg no 36 0 300 300 317K 1.3%
8 7 image 2550 3300 rgb 3 8 jpeg no 41 0 300 300 331K 1.3%
9 8 image 2550 3300 rgb 3 8 jpeg no 46 0 300 300 308K 1.3%
10 9 image 2550 3300 rgb 3 8 jpeg no 51 0 300 300 330K 1.3%
11 10 image 2550 3300 rgb 3 8 jpeg no 56 0 300 300 306K 1.2%
12 11 image 2550 3300 rgb 3 8 jpeg no 61 0 300 300 341K 1.4%
13 12 image 2550 3300 rgb 3 8 jpeg no 66 0 300 300 305K 1.2%
14 13 image 2550 3300 rgb 3 8 jpeg no 71 0 300 300 334K 1.4%
15 14 image 2550 3300 rgb 3 8 jpeg no 76 0 300 300 314K 1.3%
16 15 image 2550 3300 rgb 3 8 jpeg no 81 0 300 300 325K 1.3%
17 16 image 2550 3300 rgb 3 8 jpeg no 86 0 300 300 307K 1.2%
18 17 image 2550 3300 rgb 3 8 jpeg no 91 0 300 300 414K 1.7%
19 18 image 2550 3300 rgb 3 8 jpeg no 96 0 300 300 450K 1.8%
% pdfimages -list passport_dpi_600.pdf
page num type width height color comp bpc enc interp object ID x-ppi y-ppi size ratio
--------------------------------------------------------------------------------------------
1 0 image 5100 6600 rgb 3 8 jpeg no 6 0 600 600 1880K 1.9%
2 1 image 5100 6600 rgb 3 8 jpeg no 11 0 600 600 2045K 2.1%
3 2 image 5100 6600 rgb 3 8 jpeg no 16 0 600 600 1897K 1.9%
4 3 image 5100 6600 rgb 3 8 jpeg no 21 0 600 600 2016K 2.0%
5 4 image 5100 6600 rgb 3 8 jpeg no 26 0 600 600 1903K 1.9%
6 5 image 5100 6600 rgb 3 8 jpeg no 31 0 600 600 1991K 2.0%
7 6 image 5100 6600 rgb 3 8 jpeg no 36 0 600 600 1793K 1.8%
8 7 image 5100 6600 rgb 3 8 jpeg no 41 0 600 600 2030K 2.1%
9 8 image 5100 6600 rgb 3 8 jpeg no 46 0 600 600 1805K 1.8%
10 9 image 5100 6600 rgb 3 8 jpeg no 51 0 600 600 2032K 2.1%
11 10 image 5100 6600 rgb 3 8 jpeg no 56 0 600 600 1783K 1.8%
12 11 image 5100 6600 rgb 3 8 jpeg no 61 0 600 600 2053K 2.1%
13 12 image 5100 6600 rgb 3 8 jpeg no 66 0 600 600 1781K 1.8%
14 13 image 5100 6600 rgb 3 8 jpeg no 71 0 600 600 2035K 2.1%
15 14 image 5100 6600 rgb 3 8 jpeg no 76 0 600 600 1876K 1.9%
16 15 image 5100 6600 rgb 3 8 jpeg no 81 0 600 600 2011K 2.0%
17 16 image 5100 6600 rgb 3 8 jpeg no 86 0 600 600 1842K 1.9%
18 17 image 5100 6600 rgb 3 8 jpeg no 91 0 600 600 1973K 2.0%
19 18 image 5100 6600 rgb 3 8 jpeg no 96 0 600 600 1948K 2.0%
==== hplip ====
* https://developers.hp.com/hp-linux-imaging-and-printing/news/hplip -> "HPLIP 3.19.12 Release Notes" section - shows that support for "HP Color LaserJet Pro MFP M283cdw" was added in hplip 3.9.12.