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Change black to dark <something> in image, when printer is out of black ?

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Change black to dark <something> in image, when printer is out of black ? Greg Edwards 02 Sep 08:02
  Change black to dark <something> in image, when printer is out of black ? Daniel Hornung 02 Sep 08:49
Greg Edwards
2009-09-02 08:02:40 UTC (over 15 years ago)

Change black to dark <something> in image, when printer is out of black ?

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

Daniel Hornung
2009-09-02 08:49:05 UTC (over 15 years ago)

Change black to dark <something> in image, when printer is out of black ?

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