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Adding a layer mask.

Jun 21, 2011, 01:05
Post: #1
Adding a layer mask.
I have a skull on layer skull and bones on layer bones which is set to display under layer skull. I want to add a layer mask and paintbrush out the bones that are inside the skull area. I can not figure out how to do this yet.


Attached File(s)
.xcf  skullbones.xcf (Size: 360.44 KB / Downloads: 39)
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Jun 21, 2011, 06:20
Post: #2
RE: Adding a layer mask.
umm...is there a specific reason why you need to use a layer mask for it...? all i did with this one was erase it by hand with a fuzzy brush, then i shrunk the rest of it just because there was some left over trimming from what ever they were cut out of ...and then i added drop shadow...just cuz i wanted to play a little, this is what i got.

[Image: skullbones.png]

[Image: MMSSig-2.png]
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Jun 21, 2011, 06:23
Post: #3
RE: Adding a layer mask.
oh and id play with the curve of the wrench colors too...just a little bit...and maybe blur the edges a tid bit.

good luck and hope you find what you need to do whatchya got to do.

[Image: MMSSig-2.png]
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Jun 21, 2011, 06:40
Post: #4
RE: Adding a layer mask.
This basically boils down to: "how do I get a selection that is the contour of the skull", right?

That should be and easy one for the magic wand... click and the background and.... curses, it selects all the transparent stuff, even inside the skull! This is because the contour of the skull isn't completely "water tight", there are small gaps in it through which the selection propagates inside. We have to find a way to plug these holes. Let's try:

- Duplicate the skull layer
- Add a white layer below it and merge the two (result: skull on B&W layer)
- Filters/Generic/Erode: the black thickens
- Magic wand on background: selection stays outside of the skull, we are getting close
- Since we have grown the skull 1px by the "Erode" process: Select/Grow (1px) and to make it nice Select/Feather (1px)
- Select/Invert (you can also play Invert/Shrink/Feather
- Fix manually (using quick mask) missing/extra pixels (between the two font teeth)
- Discard B&W layer
- Save selection to channel for later uses

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