On Fri, Mar 10, 2006 at 09:49:00AM -0800, Simon Roberts wrote:
> Hi All,
> I'm really sorry this is probably a dumb/rtfm type question but I guess
> I don't know enough to know what to look for.
> I simply want to make a selection transparent. I can make the selection
> OK, but when I click the little red eraser thingy (for which the
> tooltip says "Erase to background or transparency" I can't make it make
> the selection transparent no matter what I try.
you answered your own question (see your signature)
Erase to "background or transparency".  if you are not erasing to
transparency then you are erasing to what?

> Can anyone tell me what I should be doing please?
photographs, jpegs, many (but not all) png and other file formats do not
have the notion of transparency built into them.  this notion is called
the alpha channel and it is mathematically an additional stack of color
that can also include levels of transparency.  right click on the layer
dialog and tell gimp to add this extra stack of color capacity to the
image you are trying to erase to transparency.  "Add transparency" or
something like that.

gimp does not fill with transparency.  it erases, clears, cuts or uses
masks to make transparency.

gimp handles selections its own way.  forget everything you know about


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