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I have a Cannon Pixma ip4300 printer connected to a Mac OS X system and shared using CUPS. I can print to this printer from my Ubuntu 10.04 Lucid workstation just fine, however when printing (specifically from Thunderbird) I don't have the option to print in grayscale or in "low quality"/"draft" mode. How can I enable these options to help save on printing costs?

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Adding the following to the ppd file for the printer in /etc/cups/ppd/ is what is normally done to enable grayscale support on Pixmas. After cups is restarted (/etc/init.d/cups restart) it results in a Grayscale checkbox on the Advanced tab of e.g. evince and firefox:

OpenUI *CNGrayscale/Grayscale: Boolean
*DefaultCNGrayscale: False
*CNGrayscale True/Yes: True
*CNGrayscale False/No: False
*CloseUI: *CNGrayscale

There are other possibilities - see e.g.

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