Spreadsheet to print greyscales and such

[conrad_hoffman]

I still find step tablets and grey cards handy, plus the occasional color chart. Here's a spreadsheet that makes their creation and customization quite easy. If your printer is even halfway decent it will do a fine job. It's the 9th item down on the page-

http://www.conradhoffman.com/chsw.htm

It uses macros so you'll have to enable it with file properties, or you can just use it with the numbers already loaded. Yeah, it's what the mobility-challenged do when they don't feel like going out to take pictures.

[Ed_Ingold]

Grey is not grey unless its reflectance is uniform across the visual spectrum. Likewise colors should reflect in a specific band of the spectrum, not a visual composite of primary colors in distinct bands. The science and technology behind standard color charts is the reason a letter-sized chart costs upwards of $100.

[conrad_hoffman]

One can carry things to extremes but for typical uses you can do very well with a decent inkjet printer. Vastly better, in fact, than the grey cards Kodak sold for so many years, which were all over the place in terms of color casts and reflectivity!

[digitaldog]

Depends on the goal for the old Kodak Gray card. Exposure or gray balancing (which you'd never do with raw data). 

Finding an affordable gray(s) for exposure, white balancing, gray balancing, or making DCP profiles isn't complicated or expensive. And color space agnostic (unlike sets of RGB values). 

[paddler4]

$20 for a pocket-sized spectrally neutral card that can be used to set white balance, white point, or black point: https://www.bhphotovideo.com/c/product/768395-REG/WhiBal_WB7_PC_G7_White_Balance_Pocket.html. I've used one for years.

The gray scale, however, is another matter.