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+--- Thread: Image structure (/Thread-Image-structure)
Image structure - aka - 09-06-2021
Hi,
I am begining with gimp and please need an advice ; take a look to the jointed picture.
My question is : which is the best way to have :
1. the green only in the red shap (NO green out the red shape).
2. the blue only out of the red shape (NO blue in the red shape).
I tried several things, but I think that people with experience can help me a lot !
Thanks,
aka
RE: Image structure - rich2005 - 09-06-2021
A little unclear to me
but I think this is your request.Work with layers Layers -> Mask -> Add layer mask then you can choose various types white / black..and others
A layer mask will isolate a part of the layer that is visible.
One layer and layer mask for inside a shape. (for blue)
Another layer and layer mask for outside the shape. (for green)
For your question, essentially the same layer mask, inverted colours defining areas.
The attached .xcf as an example.
RE: Image structure - aka - 09-08-2021
Thanks, it's exactly what I searched.
It remains a last thing, please : is it possible to edit an existing mask ? I don't find this function...
Best regards !
RE: Image structure - rich2005 - 09-08-2021
(09-08-2021, 05:11 AM)aka Wrote: ....It remains a last thing, please : is it possible to edit an existing mask ? I don't find this function...
A mask is a greyscale image where White = 100% transparent Black = 100% opaque and 'any grey values', vary transparency.
You can make a mask on its own by creating a greyscale image.
More customary is to paint it straight into Gimp.
Click in a layer mask to make it active (active shows a white border on the layers icons)
Then paint in your canvas using White or Black. The X key swaps between foreground and background colours which makes editing quicker.
If you need to see and edit the mask, use Layer -> Mask -> Show layer Mask make you edit the turn it off.
When finished with the layer mask click in the layer icon (gives white border) for painting.
See if you can make sense of this: https://i.imgur.com/hSsYT6G.mp4