Black levels increasing means the black slowly becoming gray.

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Added on January 23, 2010, 7:25 pmanfieldude - thanks for your comments.

Thanks

This post has been edited by jitbeng: Jan 23 2010, 07:25 PM

ft/l is measure of luminance not black level. U cannot measure black. U measure light. When ft/l increase means light level increase. Not black level increase.

Of course u r right. However, as u already know (I'm sure that u know), black level measurement is technically done when u send a 0% stimuli to the display. Since not many displays actually have zero luminance when sent a 0% stimuli, the reading is the actual black level reading. So far, on my meter only the 9G Kuro can actually shows up as zero luminance (however, my meter is not known to have good low light levels capabilities (lowest it reads accurately shd be in the regions of 1ft/L. However, even then, in the dark there is a slight glow for the Kuro. The 8G Ku.ro and the Sammy A950 are the next 2 lowest I have recorded. However, both of these panels are not close to zero luminance.

On the G series, the voltage change mechanism in the firmware is flawed, as such the black levels (based on measured data, again not mine rises from 0.004ft/L to 0.008ft/L or more and this happens before 1000hrs.

But then again, u already knew this....u were just trying to have fun...

Soon bro, I just wanna make sure it is calibrated at the new environment....

truly u are calibration sifu..

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Added on January 23, 2010, 10:17 pmanyway, as for the english part of it.. , when you say black levels increase, means lighter (whiter)??

I mean when blue level increase, I would expect it become more blue, not less blue, no?

This post has been edited by ar188: Jan 23 2010, 10:17 PM

With black and white, its easier.

With colours, its not, the colours have 3 measures, hue, saturation and luminance. Also hue and saturation is measured in the CIE chart, luminance isn't

So technically, when it becomes more blue, I'm not sure if u mean luminance or saturation....

If u desaturate blue, it approaches white. If we reduce the luminance of blue, it remains blue but with less intensity. If u shift the hue of blue, it's colours change to resemble a difference colour...

Complicating no?

For black and white, its supposed to be easier, u start with black, which is essentially the absence of light, then adding any light start shades of grey...intensifying grey u get white...supposedly.

Anyway, we've had our fun, let's not derail this thread.

so if black levels are increased to maximum value means it becomes white???

(nothing to derail.. we are discussing an area relevant to Plasma/LCD)..

Black (absence of light) has no x,y in the CIE chart. In the CIE chart, there is no black as black is not technically a colour, black is supposed to be the absence of light. However, the Y (Luminance) shd be theoretically zero. Increase luminance and u shd start getting shades of grey x,y shd be 0.3127, 0.330. Keep increasing Y and in the end u get white. Since no display can actually do absolute black, its used as a starting point for greyscale.

This is in the measure of greyscale. If u keep out all other colours, if u keep jacking luminance eventually u get white. Technically, not right though but practically correct thats what happens.

Send a 0% signal (black) to a display, increase only brightness (which is the control for black in displays) u start getting some readings of x,y, Y. Y being the luminance. The screen becomes more and more grey. Of course, brightness cannot be increased infinitely since it maxes out.



This post has been edited by anfieldude: Jan 23 2010, 11:04 PM

ok thanks for the info..

now i more confused than before... but it is good to know all the information although can't really digest it all...

salute bro Anfield...

Bro anfieldude,

If I calibrate now in my current crib, will it differ/affect much when I move to a new place?

I plan to make my living room darker to block the sun light if I move to a new place.

The greyscale and colour points won't move. However, since the room lighting will change a change in gamma might need to be made. Thus, it is better to verify if the new environment, touch up needs to be done. However, on ur set, I am not sure if there is a gamma toggle, though I suspect the Sammys have a setting to adjust gamma.

If the room is going to have even less ambient light, we can go for a higher gamma ie, darker image.

So i guess it is more advisable to do it in the new environment right?

It is better do it in the final environment.

Some interesting developments for the LCD camp. Improved way of suppresing backlight levels meaning better blacks and essentially better contrast ratios.

High Def Digest Zeon Story

Hope this can be somehow cross manufactured in local dimming LED backlit.

If this does what it claims, the only gripes of the LCD tech would be of course viewing angles and method of refresh.

LCD fans rejoice.

again it goes to show what you have in the market now is still not so good PQ la..

Definately, the LCD disadvantages need more work on. The black levels (even on the newer LED backlit) on mixed content is not as good as plasma. There is work to be done, however, if u notice the push this year is 3D, looks like some of these developments for performance improvements might take a back seat.

eat less. the slimmer the tummy the faster u catch up

old man i don't need to catch up...

Maybe old man need to change the avatar to this instead of Remy.