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color change
#7
These are the options so far:

1. Probably the one you want as Ofnuts post. Enable the alpha-lock, top of the layers dialogue and fill the layer with black. Everything will be black but the image is still RGB for annotating. Remember to un-toggle the alpha lock for further editing

2. The Color Exchange does what you asked for, changes red to black but leaves other colours.

3. A third alternative is desaturate to shades of grey Colour menu -> desaturate.

   

These used to be the bane of my life, Full sized drawings shrunk to A3 size for use in the field. Needed a magnifying glass to read the notes.

edit: Just a note but there is a degree of transparency remaining in the red. Can be adjusted if required.  http://i.imgur.com/kjb9Ysf.jpg

edit: another day: things are a bit quiet so a 2 minute video demo of using the alpha lock



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Messages In This Thread
color change - by integrator - 03-16-2017, 05:59 PM
RE: color change - by rich2005 - 03-16-2017, 06:43 PM
RE: color change - by integrator - 03-16-2017, 08:24 PM
RE: color change - by Ofnuts - 03-16-2017, 08:51 PM
RE: color change - by integrator - 03-17-2017, 06:41 PM
RE: color change - by rich2005 - 03-16-2017, 08:52 PM
RE: color change - by rich2005 - 03-17-2017, 07:06 PM
RE: color change - by integrator - 03-20-2017, 02:31 PM
RE: color change - by Blighty - 03-18-2017, 08:09 AM
RE: color change - by integrator - 03-20-2017, 12:42 PM
RE: color change - by rich2005 - 03-20-2017, 01:02 PM

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