This is what you should look on reviews or test with your own monitors. DeltaE color distance deals with color diferences, so that number is influences by brightness diference. Look for any areas that are lighter or darker than the rest. Use a photometer if measurements are required. The so-called "5 percent gray test" is a standard that many videophiles use to judge TV screen uniformity. Use one of the DisplayMate Screen Uniformity test patterns to check the uniformity. Uniformity testing in computed radiography serves two purposes: evaluating the global uniformity index and detection of artifacts on the photostimulable phosphor screen. You can load this one via YouTube and test your own TV, but be forewarned, once you see quality issues with your TV, you may not be able to unsee them. Uniformity Each of the above backlighting methods has the potential to have poor brightness uniformity in a unique way. First, we establish a baseline measurement at the center of each screen. As the IDMS points out, a 20% change in brightness from one side of the image to the other will be hard to see if the change is gradual going across the screen. When it opens, hit F11 to send your browser to full screen mode, then move your chair back a bit and watch the screen as it cycles through the colours. Screen Uniformity: Luminance To measure screen uniformity, we use 0 and 100% full-field patterns and sample 9 points. For example, a side edge-lit LED could look like this, with a black screen: In addition to the benefits of the currently recommended large-area uniformity, a small-area uniformity test can help identify sudden changes in luminance and also identify problematic areas and patterns. Also, cycle through Red, Green and Blue to look for intensity variations in the primary colors. Uniformity of CR processing looks at each cassette’s imaging plate – fed independently in the CR reader. 12. These patterns are used to check for color and gray uniformity across the screen, and for blemishes or imperfect pixels in the display. Blur Busters UFO Motion Tests with ghosting test, 30fps vs 60fps, 120hz vs 144hz vs 240hz, PWM test, motion blur test, judder test, benchmarks, and more. Full Field Test Patterns Click on any pattern to view the full screen. Use the F11 key to fill more of the screen on your browser. The actual problem is COLOR uniformity, pink or greenish tints in several zones of the screen. Look at both bright and dim intensities using a White screen color. To address the need for a more exhaustive luminance uniformity test for video displays, this article proposes a small-area uniformity method. It might be a good idea to do this in a dark room if possible. We evaluated 35 measurement spots (in 5 rows with 7 measurement spots each) and in each measurement spot we ran a Lightspace profile with a custom patch set of 98 patches - totalling in 3,430 patch reads. Here is the result data of the screen uniformity test done on the Qnix QX2710 LCD display with the settings from above. This is arguably more important than the brightness uniformity number itself to both image quality and your ability to detect a lack of uniformity. Click here to visit my Screen Uniformity Test Page.
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