QUOTE(raptor_cZn @ Jun 18 2008, 11:05 PM)
Putting the tracing paper directly on the light doesn't work? Mine is quite thick. What if you place 2 layers or move the light source further away?
Btw valho, what colour temp for bulbs are best for taking pictures of figures against a white bg? I have a 6500K bulb which looks very white / abit bluish and another 4000K lamp which is a bit warmer and yellowish.
Added on June 18, 2008, 11:10 pmAnother thing I wanted to add is that won't the pictures be grainy if you over expose them?

Like this picture here. If I want an even bg, I need to overexpose it right?
This one has a higher exposure but the hair looks a bit to bright. The colour also seems abit off since it is white-ish.

It works this way, the thicker layer the diffuse the more less light will hit the figure and the further the light also less light will hit the figure, I found it best to use 1 layer and and use a box so that the light doesn't leak out.
both the one i am using is 6500k, daylight lamp is the best but I can't find the exact color temp at shops here, i think it's below 6000k. to get perfect white bg you need to over by at least +1 EV, but this doesn't mean you'll get a perfectly balance white though, this is due to our camera always meter at 18% grey, so if it's white and you shoot without adjusting EV u get grey instead. Samething with black. What you can do is to pull the top light further from the bg, this will increase the light spread making the area that's in you frame more balance white, or get another a third lamp to light the bg.
grain appear when under expose and you try to adjust it back to the correct exposure, but usually not very visible unless you are using high ISO or the photo underexpose a lot.
both pic is slightly underexpose actually, the second have a whiter bg probably due to the light hitting that part of the bg more. The hair looks bright probably because the light is not soft enough.
for the first shot, more light is needed to light up her face, so you can tilt a white cardboard infront of her face to bounce the top light back to her.
for the second shot you should place the light to the front left of the figure.
the color is off is due to white balance, it happens even to me haha, you usually can adjust it back in photoshop

btw light placement and the amount of light u use is not fix, so play around with it, experiment until you are satisfied witht he result