Set contone colour for selected region of bitmap

[DD]

Phil.
Thanks that method is quicker AND I've learned something important about regions/masks.

Gary.
I also had a go at shapes with transparency as that would be quick too but I couldn't see a transparency mode that would change "underneath" black to a given colour ?

Again thanks to all.

Dave D

[DD]

Just played some more with transparency...

Cover areas with a red shape and then apply 0% "Colour dodge" or 0% "Screen bleach" to make "underneath" black go red.

So thanks Gary, that's the easiest method, and you can move and reshape the transparent red objects.

[DD]

Just thought I'd share:

Reading again what Phil said about the region tool and clone...

I have now learnt that clone will clone the regions if the region tool is selected.
But that clone will clone the content of the regions if the region tool is not selected.

I also note that with the region tool selected I can nudge the selected regions with the arrow keys.

[Acorn]

Why not just an a sigma from a font, and colour red and drop on top of the image?

Go further, use Latex, and embed code like this into a body Placeholder:

\[\frac{\partial \dot{v}}{\partial t}=l(x,z)[\frac{\partial }{\partial {x}}(\color{red} {\sigma}_{xy}) +\frac{\partial }{\partial {z}}(\color{red} {\sigma}_{zy})] 
\]
<script type="text/javascript" src="http://www.hostmath.com/Math/MathJax.js?config=OK"></script>

Acorn