I think it depends on the brand you have, sometimes a differance can be seen but it is really noticeable. Thats what I have found with Ink saver software on my pc anyway, I don't know about everybody else.
Check that your printer is compatible with Inksaver. Most HP,Epson and Canon will work with it, other makes like some Lexmark, Dell, are not recommended. Serif were selling this at one time for £9.95,as a promotional offer. PCW use to stock it as well.
Another way to save ink is to always use the 'Inkjet transparency' setting when selecting paper type This reduces ink flow considerably, yet still give usable print - I print high quality images on photo gloss with this setting, if anythintg the result is brighter.
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