I'd like to do two different ligthing effect:
- one is when I swith on a TV
- one is when I switch on a lamp
So in addition to the shadow of the character and all the thing in the background...what I have to do?
Many thanks in advance for your support
Giuseppe
Ligthing Effect
Moderators: Víctor Paredes, Belgarath, slowtiger
-
hayasidist
- Posts: 3851
- Joined: Wed Feb 16, 2011 8:12 pm
- Location: Kent, England
take a look at this image.
(I claim no credit for this - it is from a Prof at MIT).
shadows are areas where light isn't hitting, contrasted by adjacent areas where light is hitting.
Squares A and B are actually the same colour. The eye is fooled into thinking A is dark and B is light because of the colour gradient in the sqaures that surround them.
So when you turn on the room light think in terms of adding light where there wasn't any rather than, as such, creating shadows.
So now imagine that checkerboard with the light off: all the light squares will look "B" coloured (i.e. unlit - grey about RGB=100) and the dark squares are dark grey (around RGB=40). The light needs to change the "lit" squares so that the dark ones go up to RGB=100 (from 40) and the light ones go to about RGB=200 (from 100). Grab the image and use a colour picker to see the actual values.
That assumes a nice "white" light... a different coloured light (say the yellowish glow of an incandescent bulb) will have a different effect; and the brightness of the light will also change the result ... which brings me to the TV ... which has time varying brightness and colour.
Hope that helps get you started.
(I claim no credit for this - it is from a Prof at MIT).
shadows are areas where light isn't hitting, contrasted by adjacent areas where light is hitting.
Squares A and B are actually the same colour. The eye is fooled into thinking A is dark and B is light because of the colour gradient in the sqaures that surround them.
So when you turn on the room light think in terms of adding light where there wasn't any rather than, as such, creating shadows.
So now imagine that checkerboard with the light off: all the light squares will look "B" coloured (i.e. unlit - grey about RGB=100) and the dark squares are dark grey (around RGB=40). The light needs to change the "lit" squares so that the dark ones go up to RGB=100 (from 40) and the light ones go to about RGB=200 (from 100). Grab the image and use a colour picker to see the actual values.
That assumes a nice "white" light... a different coloured light (say the yellowish glow of an incandescent bulb) will have a different effect; and the brightness of the light will also change the result ... which brings me to the TV ... which has time varying brightness and colour.
Hope that helps get you started.