[Nexus 4 Q&A, Help & Troubleshooting] Whosdaman:
I've killed my phone three times over the past two days working on new color settings. There are so many possible combinations of color settings with these newly introduced abilities that allow us to manipulate the neutral tones of each RGB color separately. It has become so complex and tricky that I've started taking notes while I mess with the values. One thing I've discovered while playing around are these things I like to call sweet-spots.

Sweet-spots are values that hold true no matter what color setting combination you are using. These sweet-spots are unique values for each individual setting, but there is a chance that these sweet-spots are similar, possibly identical, over a widespread of devices. The sweet-spots can potentially provide us a way to place constraints on particular settings that facilitate the calibration process, thus allowing anyone the opportunity easily calibrate their own displays. Folks, it's no longer a mystery that one man's calibrated color settings simply won't work for the majority. If you want perfect display calibration, it is going to require some amount of effort from you. No worries though, I'm going to provide you with instructions that will help assist you with establishing a solid starting place that you can build off of so you aren't working blind.

Sweet-spots are possible values that hold true no matter what settings you are running. For example, whites must be between 0-3 for each color. It is a generalization, but I have reviewed it on both a rev10 N4 and rev11 N4. I can't help but believe that this could hold true for every display.

Whites cannot be any higher due to improper calibration of image 4 found within FKU. Referring to image 4, the only time the gradients are equally distributed throughout the entire image is when white is set within these values. For my rev10 N4 display, white must be either 1 or 2 depending on the effects, influences, and variables of the different combinations of color settings I happen to be using. This same policy applies to the black color settings. I've found blacks must be set at an absolute minimum value of 87, and that's using the same exact method of obtainment I used to discover the sweet-spot for the white attribute. There should be literally no need or reason to set these certain color categories to any other values no matter the what display you have. I'll thoroughly explain why in just a second. In fact, I'll go ahead and describe my method for calibrating N4 displays that way everyone can prove to themselves that what I'm discussing isn't just a bunch of hot air.

My theory for capturing the precise white and black values for the displays is extremely simple and is mainly based on the stock Nexus values. A few of you might be able to take advantage of this information and expand on it. This process is identical to what I do when starting from scratch to calibrate the N4 display.

First off, set main RGB values to 255 each. After that, lower every gray and mid value found within the sub-RGB settings to 0. Next, open "Misc Gamma Settings" and set the contrast & brightness values to 15. . Ensure your device's display brightness is set at 50%. Then reopen the sub-RGB settings one at a time and begin slowly and incrementally tweaking the white & black values until the correct values are discovered. Once satisfied with the results, write down the values that way you will always have a place to start from.

Now here's the most important question that most of y'all are probably wanting to ask me. "How exactly do we know when we have obtained the correct and accurate white and black values?" Great question, thankfully it isn't hard to do, but does require some level of subjective input on your end.

When adjusting the white and black values, have image 1 up on your screen. You'll have found the perfect white and black settings for your device observing a clear and consistent transition between each box on image 1. As well, box 2 will be basically pure black and box 254 will be essentially pure white. That is the first check for proper white and black value obtainment. There is one other calibration image that we must check before confirming the values are the right ones.

Image 4 is used to ensure proper balancing between loud and neutral colors. If you are using the settings I specified above, the image will contain color banding throughout. This is usually a major problem since professionally calibrated devices will only reveal neutral colors while viewing image 4. Nonetheless, perfect image 4 calibration is not critical for what we are doing. With that cleared up, take a look at image 4. When the correct white and blacks value are selected, each gradient will appear to be smooth even transition from black to white going left to right and top to bottom. As well, the gradients should be complete to the edges. This is the most important calibration image for this scenario.

After that you will have your base the begin with and start tweaking away! Be sure to save your favorite settings!!