Brighter screen android xda
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The Vivid profile is a color-boosted profile, which increases the saturation of colors on the screen. The white point of the profile targets D65/6500 K (with my measurements reading about ~6300 K), and its tone mapping targets a standard gamma of 2.20. The Natural profile is the phone’s color-accurate profile, and it targets the sRGB color space with color management up to the Display P3 color space. The Vivid mode was set as default on my Snapdragon unit.
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The Samsung Galaxy S21 Ultra (along with most other Android devices) maintains the same screen color mode configurations as its past two generations, with its Vivid and Natural profile.
All HDR patterns are tested at an HDR-average 20% APL with constant power test patterns. HDR sRGB and P3 patterns are spaced out evenly with sRGB/P3 primaries, an HDR reference white level of 203 cd/m 2 (ITU-R BT.2408), and a PQ signal level of 58% for all its patterns. HDR test patterns are tested against ITU-R BT.2100 using the Perceptual Quantizer (ST 2084). A color error Δ E TP less than 3.0 is an acceptable level of accuracy for a reference display (suggested from ITU-R BT.2124 Annex 4.2), and a Δ E TP value greater than 8.0 can be noticeable at a glance, which I’ve tested empirically. A measured color error Δ E TP of 1.0 denotes the smallest value for a just-noticeable-difference for the measured color, while the metric assumes the most critically-adapted state for the observer so as not to under-predict color errors. Δ E TP values are roughly 3 × the magnitude of Δ E 00 values for the same color difference. Charts and graphs are also plotted in PQ-space (if applicable) for proper representation of the actual perception of brightness. The brightness increments are spaced evenly between the maximum and minimum display brightness in PQ-space. Colors are measured at 73% stimulus, which corresponds to about 50% magnitude in luminance assuming a gamma power of 2.20.Ĭontrast, grayscale, and color accuracy are tested throughout the display’s brightness range. Our targets are spaced out roughly even throughout the ITP color space at a reference 100 cd/m 2 white level, and colors at 100%, 75%, 50%, and 25% saturation. Our color targets are based on the ITP color space, which is more perceptually-uniform than the CIE 1976 UCS with much better hue-linearity. This way, we can more thoroughly analyze and understand the performance of a display. Furthermore, it is helpful to separate the two errors when assessing a display’s performance because, just like with our visual system, they pertain to different issues with the display. However, since the human visual system interprets chromaticity and luminance separately, I hold our test patterns at a constant luminance and do not include the luminance (I/intensity) error in our Δ E ITP values. Δ E ITP normally considers luminance (intensity) error in its computation, since luminance is a necessary component to completely describe color. Those that are still using Δ E 00 for color error reporting are encouraged to use Δ E ITP. I use the latest color difference metric Δ E TP (ITU-R BT.2124), which is an overall better measure for color differences than Δ E 00 that is used in my earlier reviews and is still currently being used in many other sites’ display reviews. I use a higher average pixel level closer to 50% to capture a midpoint between both the lower pixel levels and the many apps and webpages with white backgrounds that are higher in pixel level. Additionally, a constant average pixel level does not inherently mean constant power the patterns I use satisfy both. It’s important to measure emissive displays not only with constant average pixel level but also with constant power patterns since their output is dependent on the average display luminance.
I use constant power patterns (sometimes called equal energy patterns), correlating to an average pixel level of about 42%, to measure the transfer function and grayscale precision. My measurements are typically done with display-related options disabled unless mentioned otherwise.
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The test patterns and device settings I use are corrected for various display characteristics and potential software implementations that may alter my desired measurements.
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To obtain quantitative color data from the display, I stage device-specific input test patterns to the Samsung Galaxy S21 Ultra and measure the display’s resulting emission using an X-Rite i1Display Pro metered by an X-Rite i1Pro 2 spectrophotometer in its high-resolution 3.3nm mode.