Daniel Carrera wrote:
Nicu Buculei wrote:
BTW, if you need the logo slightly bigger or smaller, either ask for a
new size (but say exactly what size do you want) or ask and I will
teach how to do it yourself.
I'd like to learn how to do it myself. :-)
The basic idea is to import the PNG in GIMP and apply two effects: bump
map and drop shadow.
The catch is that if you import the picture as a whole the effect will
not look that good and we have to improve the z-order.
So what I did:
The SVG image is composed from 3 objects: Enthought logo, the feather
and the text. I exported from Inkscape each object as a separate PNG and
imported them as layers in GIMP (one image with 3 layers). I posted in a
previous message the XCF as reference
(http://ooo.nicubunu.ro/oooauthors/gimp_shadow.xcf)
The layer with the Enthought logo remain unmodified, and to the each two
others two effects are applied: bump map and drop shadow.
Added another layer with white background to have a good preview.
This is all.
Now to the effects:
Drop shadow is very simple: Script-Fu->Shadow->Drop Shadow. Adjust
parameters as needed, they will depend on the size of the image, AFAIK I
used Offset Y: 2, Offset Y: 2, Blur Radius: something between 4 and 8,
Opacity 60 and do not allow resizing.
Bump map: there are two ways. The simple one is to use
Script-Fu->Decor->Add Bevel, but I do not like it because it does not
offer enough control.
The other way has a few steps:
- duplicate the layer and make the entire graphic white (easy way: check
"Keep transparency" and draw over it with a white brush).
- add a new black layer under this and merge the two, to obtain a
white-on-black copy. Blur it (Filters->Blur->Gaussian Blur, I used here
the value 5, for a larger image a larger value may be needed). Make this
layer invisible, it will be used as mask.
- select the layer with the drawing and use Filters->Map Bump Map. Use
as mask the layer from the previous step and adjust parameters as needed
(I changed here only Depth to 2)
Something similar is described at
http://gug.sunsite.dk/tutorials/tomcat1/ or
http://gug.sunsite.dk/tutorials/tomcat16/
Notes:
1. The GIMP people are doing a clean-up of the menus for usability
reasons, the Script-Fu menu will disappear and it contents will be moved
in other places
2. the SVG standard allow some similar effects for drop shadows and bump
map, but Inkscape does not implement them yet (expected only after they
will change the current renderer with Cairo)
--
nicu
my OpenOffice.org pages: http://ooo.nicubunu.ro
