Free Curves Adjustment for Photoshop Elements, works with versions 1 through to 6 Download here
SmartCurve (http://free.pages.at/easyfilter/curves.html)
- Curves adjustment of RGB and gray images.
- Full support of 8 and 16 bits color depth.
- Use of the more common gamma correction.
- Smart-display of the live histogram.
- Auto level correction by setting of shadows and highlights.
- Remove of color casts by setting of multiple midtones.
- Highlighting of clipped colors.
- Different color spaces like RGB, CMK, Lab and others.
- Channel masks to limit curve effects.
- Works as smart filter in PhotoShop CS3.
- Pixel and percentage curve editing and view.
- Batch Mode for applying a curve on multiple images.