Hello

I am a amateur user of Photoshop CS3

I find that using brushes for blood spatter tend to look faint and washed out.

How can I make the effect using blood brushes look more realistic.

Color more deep, shiny, that king of thing

Thanks in advance

You didn't upload a representative image so I wouldn't know what you mean by faint and washed out but I'll take a stab...no pup intended...and say that perhaps putting your blood splatter on seperate layers and setting the layer's mode to multiply several times should do the trick.

do you mean something like a puddle of blood or trail of blood spatters??  - like Quest said, it's a little easier to give you a good answer if you can show us what you are attempting to do...

retrocity

Original Brush Stroke on Left / Adjusted Image on Right.

If this is the effect that you want then these are the steps I took:

1. Create a new layer and put your blood splatter brush strokes onto it.
2. Go to Filter>Stylize>Emboss - My settings were Angle 144/ Height 25/ Amount 50.  Adjusting the angle allows you to match the light direction of your blood splatter to that in your image.
3. Add the following adjustment layers: Colour Balance, Curves, Brightness/Contrast, Hue/Saturation and create a clipping mask for each adjustment layer (Layer>Create Clipping Mask) 
4. Adjusting the red channel in Colour Balance brings the embossed image back to blood red.  Curves and Brightness/Contrast adjust the balance between the light and dark areas of your blood splatter.  Adjusting the saturation and the lightness/darkness of the red channel fine tunes the blood colour.