[Gimp-user] Change black to dark something in image, when printer is out of black ?

2009-09-02 Thread Greg Edwards
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
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Re: [Gimp-user] saving layers

2009-09-02 Thread Norman Silverstone

  Suppose there are three different layers in a stack that need to be
  saved individually and then used as the input for a RPI plugin. What
  would be the best procedure to use, please?
 
 Make the layer you wish to save active by clicking on its thumbnail  
 preview in the Layers Dialog, then from the File Menu select the Save  
 As item. Give your filename a .png extension.
 
 Since the PNG format does not support multi-layer images, you will be  
 presented with an Export Dialog which asks whether you want to Flatten  
 your image or Merge its layers; you want to do neither so click on the  
 Ignore button and just the active layer will be saved.
 
 Repeat the process for the other layers.

Thank you for that way of dealing with the problem. I have found another
way which is to drag the thumbnail up to the tool box when a new window
opens and the image can be saved from there as '.xcf' or even worked on
before saving.

Norman

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Re: [Gimp-user] Change black to dark something in image, when printer is out of black ?

2009-09-02 Thread Daniel Hornung
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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Re: [Gimp-user] GIMP Macro

2009-09-02 Thread Tobias Jakobs
Moin,

On Wed, Sep 2, 2009 at 14:47, Paul Naudep.na...@esteq.com wrote:
 Is it possible to record a macro (or script-fu) by recording a number of
 steps of a process you know you’ll repeat for a number of images?

no, there isn't.

Regards,
Tobias

P.S. Please don't send HTML Mails to mailinglists.
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Re: [Gimp-user] saving layers

2009-09-02 Thread Chris Mohler
On Tue, Sep 1, 2009 at 8:02 AM, Norman Silverstonenor...@littletank.org wrote:
 Suppose there are three different layers in a stack that need to be
 saved individually and then used as the input for a RPI plugin. What
 would be the best procedure to use, please?

Here is a plug-in to export all layers as PNG files:
http://registry.gimp.org/node/18440

I wrote it as an exercise in learning more about python and GIMP, so
it's not battle-tested.  May kick your dog, eat your kittens, etc.
Only tested on linux, but it *should* work on win/mac.

Although if you are only dealing with three layers, it probably won't
help much - I was thinking of having 10 or 20 layers and having to
save each one...

Chris
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