How to force lp from CUPS to print in grayscale?

Question

I want to print an image from a command line:

lp -o scaling=//100// image.jpg

How can I force it to be printed in grayscale?

Solution 1

Maybe you are looking for lpoptions ?

Use lpoptions -l in order to know what's the name for your printer.

You can play it like thi (example with an HP Photosmart) :

lp -o scaling=//100// -oColorModel=KGray image.jpg

Solution 2

If you look in the PPD file for the current printer, you should get a hint of how to denote grayscale printing (or any option for that matter). It could be as above or ColorModel=Gray, ColorModel=Grayscale, etc.

Try the following command to search the options for printers on your system:

grep -i gr[ae]y /etc/cups/ppd/*.ppd

Comments

[Admin]

See also unix.stackexchange.com/a/18449/77539

[n0pe]

Could you add a solution? Maybe the command to run to convert an image to greyscale.

[casualunixer]

@n0pe, try: stackoverflow.com/q/13317753

[Admin]

The question is not about Raspberry.

[Admin]

But as raspberry is Linux based. So the options would be same, I hope.