convert to background

[andib]

hello, I'd like to convert a grayscale image to a background image suitable for a website.
The first idea I had was to increase the brightness, but in this way there were most parts completely white.
The second idea is to decrease the black level of most dark parts without going under a sort of "level of visibility". In this way I hope that dark parts become sufficiently clear to display the black text I write over them, and the image can mantain its shape.
I don't know what are the commands to use, can you help me?
Thank you.

[Bonzo]

How about doing something like this: http://www.rubblewebs.co.uk/imagemagick ... o=blue.jpg

This is overlaying a plain blue image over a photo and "blending" it. You could overlay a white image over your grayscale one ?

[andib]

perfect, it's exactly what I need, thank you very much

[anthony]

Look at the techniques in IM Examples, Color Modifications
http://www.imagemagick.org/Usage/color/