More Wikipedia links

Quote - Wikipedia:

Quote - " If images are not gamma encoded, they allocate too many bits or too much bandwidth to highlights that humans cannot differentiate, and too few bits/bandwidth to shadow values that humans are sensitive to and would require more bits/bandwidth to maintain the same visual quality."

 

http://en.wikipedia.org/wiki/Gamma_correction

Normal images have RGB with 8 bits and always use 8 bits, gamma encoding will not make it use 5 bits and without GC it will not be 10 bits. It always are 8 bits and always consume the same bandwidth, no matter if is gamma encoded or not or is black or pink color, always are used 8 bits.

Quote - Kawecki - go read something for once. Just once.

Quote - A common misconception is that gamma encoding was developed to compensate for the input–output characteristic of cathode ray tube (CRT) displays.[2] In CRT displays the electron-gun current, and thus light intensity, varies nonlinearly with the applied anode voltage. Altering the input signal by gamma compression can cancel this nonlinearity, such that the output picture has the intended luminance. But in fact, the gamma characteristics of the display device do not play a factor in the gamma encoding of images and video—they need gamma encoding to maximize the visual quality of the signal, regardless of the gamma characteristics of the display device.[1][2] The similarity of CRT physics to the inverse of gamma encoding needed for video transmission was a combination of luck and engineering which simplified the electronics in early television sets.

http://en.wikipedia.org/wiki/Gamma_correction

You are so tiresome it is mind numbing.

If you people do not POUND him into shutting up, I'm leaving.

You continue to post articles from Wikipedia, this help you nothing, because Wikipedia, even it can be useful for referrences, is full of mistakes and written by anyone many time lacking the knowledge on the subject.

In your refference there are two big mistakes:

"varies nonlinearly with the applied anode voltage" It is non-linear with the grid voltage and not the anode. Is the grid voltage that controls the intensity and not the anode that is kept more or less constant at 30,000 Volts

"they need gamma encoding to maximize the visual quality of the signal" Gamma correction has nothing to do visual quality and has no effect on signal to noise ratio. The signal is transmited inverted where the hyper-black levels have the biggest amplitude.

Do you know what is transmited in the TV signal, do you think that is RGB ? and do you know what is gamma corrected ?

Errata:  (x^1/2.2)^1.4 = x^0.63

If you have a texture gamma corrected 2.2 and you view it in a typical old CRT monitor that has a gamma 1.4 and not 2.2 you will not see the right colors

(x^1/2.2)^1.4 = x^0.8 and not x^1 = 1

CRT tubes has not a gamma 2.2 !!!!, the theorical value is 1.5, in practice due to the anode voltage are a little more linear and so, the value 1.4 is used.

You must use a texture corrected with gamma 1.4 or use a normal texture without GC and then correct the final image with a gamma 1.4

In modern LCD/LED monitors the gamma is 1.0, so they need no gamma correction. You can verify this very easily, take the same image and look it in an old CRT monitor and then look it in a LCD/LED monitor, you will see the clear difference in the dark areas of the image. You must use an old CRT monitor or a cheap one because many modern CRT monitors have built-in gamma correction electronics

Quote - Can you produce some renders, Kawecki, with settings to substantiate your views?

Renders are subjective and anyone can manipulate to prove anything. For example, the renderings posted in the gallery using GC for me looks washed, dull and without life, but other people find them excellent.

But math are not subjective and t1^g + t2^g is not the same as (t1 + t2)^g where g is not 1.0

Gamma correction should only be applied,if wanted, on the final render image. Applying GC in internal rendering stages produces unreal and not physically correct results.

For example, if you combine two textures t1^g + t2^g is not the same as (t1 + t2)^g or (t1^g + t2^g)^1/g will not give t1 + t2

Well, it was a try. This mesh create three vertices with normals 0,0,0

Copy this text and save it with an obj extension, then import it in PP2012 with all options unchecked and then export it again as obj. Look at the exported obj and see if there are more than one normals in a single line.

v -0.05 0.10 -0.05
v -0.05 0.10  0.05
v  0.05 0.07 0.05
v -0.05 0.07 0.05
v  0.05 0.10 -0.05
v  0.05 0.10  0.05
v  0.05 0.07 0.05
vt 0 0.00
vt 1 0.00
vt 1 1.00
vt 0 1.00
vt 1 0.87
vt 0 0.75
vt 1 0.75
f 2/1 6/2 5/3 1/4
f 7/5 4/6 3/7

Quote - I know this is an extremely hard bug to fix -

It is not. Once the bug is well defined it is very easy for whom made the code to fix it. There are two cases that makes very difficult to correct bugs. 1- The bug appear to happen at random and you cannot make the bug happen at your will. You tests, test, test and all is ok, you return it to the user and the bug happens again. 2- The police of the company. Many companies refuse to acknowledge that their product or service has something wrong. The user is always guilty. They turn the user around and around until he/she desist. The bug report and its details never reach the responsible for the code and is he/she that can fix. Even he is aware of what happened he is not allowed to fixed it because it would recognize that the company had a faulty product or service and it were sold hundreds or thousands of it.

Quote - I'm not defensive, but I know how kawecki behaves and I know what happens in this forum when somebody, confused by incomplete knowledge, starts a showdown with me, about the f***ing math.

If you want to learn something about cathode ray tubes (CRT) I recomend you the book "Cathode Arcs" by Andre Anders. Is good to read some serious technical books instead of repeating what someone put in some site in the internet icluding Wikipedia, even has its merits, is only one more site where anyone can write what he wants. And if maths are not your baby is good to learn them too, because without maths you go nowhere in technical subjects.