Which iphone 4 color is better

The only way that a display will deliver good color and gray scale accuracy is if it is accurately calibrated to an industry standard specification, which for computers, digital cameras, and HDTVs is sRGB or Rec. If the Color Gamut is smaller than the standard then the image colors will appear too weak and under-saturated.

If the Color Gamut is greater than the standard then the image colors will appear too strong and over-saturated.

The important point here is that a Color Gamut larger than the standard is also bad, not better. Wider color gamuts simply distort and decrease color accuracy and should be avoided, except for some special applications. The dots in the center are the measured White Points for the phones along with the D Standard, which is marked as a white circle. The outermost curve are the pure spectral colors and the diagonal line on the bottom right is the line of purples.

A given display can only reproduce the colors that lie inside of the triangle formed by its primary colors. Figure 2. Both the iPhone 4 and Galaxy S perform poorly with reference to the standard Color Gamut, which is the black triangle in Figure 2. As a result the iPhone produces images that have significantly too little color saturation and the Galaxy S produces images that have significantly too much color saturation.

This applies to all external content viewed on the displays, including web content, such as images, photos and videos. This was easy to see in the viewing tests where we compared the displays side-by-side to a calibrated Professional Sony High Definition Studio Monitor using a large set of DisplayMate Calibration and Test Photographs. Galaxy S photos had too much color, to the point of appearing gaudy, particularly faces, and well known objects such as fruits, vegetables, flowers, grass, and even a Coca-Cola can.

The iPhone had the reverse problem, all of the photos looked somewhat pale, flat, washed-out and under-saturated. The standard intensity scale is not linear but rather follows a mathematical power-law, so it is a straight line on a log-log graph. Its slope is called Gamma, which is 2. In order to deliver accurate color and intensity scales a display must closely match the standard.

Figure 3. Intensity Scale for the Apple iPhone 4. The iPhone 4 is too steep with respect to the Standard intensity scale, which is needed in order to accurately reproduce images and pictures for most content. Gamma is the slope of the intensity scale, which should be a constant 2. The Gamma for the iPhone 4 is 2. A major problem with many displays, especially LCDs, is that the image changes with the viewing angle, sometimes dramatically.

Some display technologies are much better than others. This behavior is typical for LCDs. At a moderate 30 degree viewing angle the Black Level Brightness decreased somewhat to 0. Colors generally shift with viewing angle whenever the brightness shifts with viewing angle because the Red, Green and Blue sub-pixels each shift independently and vary with intensity level.

These values are so low that the Apple iPhone 4 barely shows any detectable color shift with angle. The power consumed by LCD displays is independent of the brightness and color distribution of the images — it only depends on the Brightness setting of the backlight that illuminates the LCD from behind.

The Automatic Brightness option allows the ambient light sensor on the Apple iPhone 4 to adjust the backlight brightness and power setting as the ambient light changes. This not only improves visual comfort but can also increase the battery run time. We turned off Automatic Brightness for the tests. It is possible to indirectly determine the power used by the display by measuring the AC power used by the iPhone 4 with different backlight settings. Table 1. Peak Red. Peak Green. Peak Blue.

Peak White. Measured Luminance. Relative Luminous Efficiency. The spectra of an LCD display is just the spectrum of the backlight filtered through the individual Red, Green and Blue sub-pixel filters within the panel.

OLEDs are emissive devices so the spectra of the Samsung Galaxy S is just the sum of the individual Red, Green and Blue OLED spectra, modified slightly by the touchscreen layer and anti-reflection absorption layer through which their light must pass. We thought it would be very useful and interesting to compare the spectra of the Galaxy S with the spectra of the Apple iPhone 4, so we asked Konica Minolta to loan us their flagship CS Spectroradiometer to perform the measurements.

By Jason D. Remember the company that was selling white iPhone parts out of Brooklyn that were drop-shipped from Shenzhen? Well, WhiteiPhone4Now. Focus Supply is selling iPhone 4 parts in six colors including white, purple, red, blue, green and my favorite, transparent. Quantum computing skills are hard to find.

Here's how companies are tackling the shortage. To keep up with this news follow me, Kit Eaton , on Twitter.

That QR code on the left will take your smartphone to my Twitter feed too. AWS Deloitte Genpact. Events Innovation Festival. Follow us:. By Kit Eaton 3 minute Read. The metal is stainless steel. That mysterious back is glass too, scratch resistant and drop-resistant like the front. The motion sensors are joined by a gyroscope, for more accurate positional sensing. The front-facing camera is there, for much-anticipated video calls and VoIP video.