I have a SVG drawing with black foreground and white background.
What is the easiest way to change foreground to white and the background to transparent (in InkScape or similar free program)?
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There is no easy single step procedure do do that! There is however a multi-step procedure available using InkScape.
To change the background to transparent go to File > Document Properties > Background and check the alpha channel (A). Set the value to 0 (zero).
However, if your drawing contains white objects overlaying another object, you should as an intermediate step set the background to a special color, say pink semi-transparent, to easy the following steps.
Changing the white objects color to transparent will not work, as the outer objects color will shine through (in my case black).
I used the following steps:
Step 1: Mark the outer outer (black) object, then shift mark the inner (white) object.
Step 2: Select Path > Difference (or Ctrl+-).
The inner object is deleted in the process, which is what we want here!
Repeat step 1 and 2 for other white objects.
Step 3: Fill all black objects with white.
Step 4: Change the background to fully transparent. Now your drawing disappears and appears all white. This is okay!
Finally save and export as PNG-image.