On Wednesday 02 September 2009, Greg Edwards wrote: > Hi, > The scenario - have an inkjet printer which regularly runs out of black > ink, but still has plenty of colour ink. I would like to change black to > dark blue or whatever, so I can print eg. a concert ticket with a black > barcode, which will still scan fine at the venue entrance. > > On SGI in Days of Olde, this would be " repcol ticket.rgb 0 0 0 0 0 20 > 10 " or similar, ie. replace all pixels within 10 units (out of 255) of > black with dark blue. Good old Paul Haeberli and his gfx tools. > > Appreciate assistance in doing this in Gimp - 2.6.7 on Mac with Snow > Leopard (10.6). Or indeed a command line tool of any kind, I need this > little trick quite a bit. > > ATdhvaannkcse ! > > Greg E
Wouldn't it be the easiest way to set the printer to use CMY only instead of CMYK? Many printer drivers can do this. A dark blue would still consist of a lot of black since GIMP only knows about RGB and only when printing this is converted to a more printer-native representation. Daniel
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