Joined
·
16,014 Posts
What do you think we might want to do differently from below when using DVI?
Bob
----------------------------------------------------------------------------------------
"2. Not really a separate step, but easier to discuss separately. I further increase contrast ratio by letting the green and blue DLP elements run further open (green and blue contrast turned up). Normally, you have to restrict the green and blue output to compensate for the blue-green light which the lamp produces. That correction to D65 robs the projector of about 30 to 40% of its actual potential contrast range. By letting the green and blue contrast run higher than will produce D65 I allow the DLP modulation to have a larger difference between its on state for 100 IRE and its off state. More contrast is achieved and but grayscale becomes blue green. Here's is where the magic of step 3 comes into play.
3. Add a Hoya FL Day filter in front of the projector. This cuts green and blue back down to allow D65 to be achieved with the green and blue DLP gains to be wider open. The overall light output is also dropped by the filter, but there is plenty of light anyway. The combination of FLD filter + recalibration to d65 with the filter in place drastically darkens blacks and bootst contrast ratio. There may be other filters which more efficiently white balance the lamp, but this is the one I am using. I taped it to the front of the lens, but tilt the top of the filter out to allow air circulation.
After that, a lot of work needs to be done to calibrate the projector. I'm still working on my own. The correct settings will vary from unit to unit. Fed via S-video I am using the following.
User Setting based on Movie
Picture
brightness -18
contrast 30
color 38
hue 30
sharpness 9
Gamma correction : Dynamic
Color correction:
red 0, green 0, blue -1, yellow 6, magenta 0, cyan 0, color gain -4
White balance
Brightness red -14, green -1, blue 0
Contrast red 158, green 128, blue 149
Picture Enhancements
SweetVision Low
Black Expansion 3
Contrast Enhancment Off"
Bob
----------------------------------------------------------------------------------------
"2. Not really a separate step, but easier to discuss separately. I further increase contrast ratio by letting the green and blue DLP elements run further open (green and blue contrast turned up). Normally, you have to restrict the green and blue output to compensate for the blue-green light which the lamp produces. That correction to D65 robs the projector of about 30 to 40% of its actual potential contrast range. By letting the green and blue contrast run higher than will produce D65 I allow the DLP modulation to have a larger difference between its on state for 100 IRE and its off state. More contrast is achieved and but grayscale becomes blue green. Here's is where the magic of step 3 comes into play.
3. Add a Hoya FL Day filter in front of the projector. This cuts green and blue back down to allow D65 to be achieved with the green and blue DLP gains to be wider open. The overall light output is also dropped by the filter, but there is plenty of light anyway. The combination of FLD filter + recalibration to d65 with the filter in place drastically darkens blacks and bootst contrast ratio. There may be other filters which more efficiently white balance the lamp, but this is the one I am using. I taped it to the front of the lens, but tilt the top of the filter out to allow air circulation.
After that, a lot of work needs to be done to calibrate the projector. I'm still working on my own. The correct settings will vary from unit to unit. Fed via S-video I am using the following.
User Setting based on Movie
Picture
brightness -18
contrast 30
color 38
hue 30
sharpness 9
Gamma correction : Dynamic
Color correction:
red 0, green 0, blue -1, yellow 6, magenta 0, cyan 0, color gain -4
White balance
Brightness red -14, green -1, blue 0
Contrast red 158, green 128, blue 149
Picture Enhancements
SweetVision Low
Black Expansion 3
Contrast Enhancment Off"