>> I maintain my own web site, Resonator Software. While writing a HTML >> page, I wanted to use my black background logo as a background for this >> page, but I wanted a white version. The logo is here: >> >> http://www.ResonatorSoft.com/colorwave.jpg Brendan, I think I've achieved what you want with a simpler, and hopefully cleaner result. You be the judge. Here are the steps I took: 1) Open colorwave.jpg. 2) Open the Layers and Channels dialog by typing C-l in the image window. 3) Create a new layer above the colorwave logo. Make the new layer white. 4) Set the blending mode of the new layer to "Difference". 5) Flatten the image by right clicking in the Layers and Channels dialog box. 6) Open <Image>/Image/Colors/Hue-Saturation and position the Hue slider to 180 (with the Master radio button selected). Hope this helps, Carey ------------------------------------ Dr. Carey Bunks Senior Scientist BBN Technologies 70 Fawcett St, 15/2A Cambridge, MA 02138 tel: 617-873-3028 fax: 617-873-2918 email: cbunks@xxxxxxx ------------------------------------