[GRASS-user] Transparent-background elevation shadings

GRASS GRASS user
1

Hi,

Aside my previous - more complete - mail, here is one quick question:

Is it possible to create an alpha-to-black color table in GRASS, which
could than be assigned to an elevation shadings (created via
r.relief.shaded) layer in order to get a transparent background on
elevation layers ?

Thank you for your time,

Felix

2

Felix Schalck wrote:

Is it possible to create an alpha-to-black color table in GRASS, which
could than be assigned to an elevation shadings (created via
r.relief.shaded) layer in order to get a transparent background on
elevation layers ?

No; colour tables don't have an alpha component.

--
Glynn Clements <glynn@gclements.plus.com>

3

Felix Schalck wrote:

Hi,

Aside my previous - more complete - mail, here is one quick question:

Is it possible to create an alpha-to-black color table in GRASS, which
could than be assigned to an elevation shadings (created via
r.relief.shaded) layer in order to get a transparent background on
elevation layers ?
  

Can't you get what you want by creating a MASK where you want the shaded relief to be transparent, then with r.mapcalc make a new shaded relief map which will have null values where the original is MASKed out.

Thank you for your time,

Felix
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