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The screen-door effect (SDE) is a visual artifact of displays, where the fine lines separating pixels (or subpixels) become visible in the displayed image. This can be seen in digital projector images and regular displays under magnification or at close range, but the increases in display resolutions have made this much less significant.
The effect is more noticeable on these cases due to the saturated colors and small pixel scale details normally present on computer graphics. [ citation needed ] The opposite problem, luminance interference in chroma, is the appearance of a colored noise in image areas with high levels of detail.
These effects can occur in both analog and digital photography. Chromatic aberration due to optical dispersion through a lens, leading to color fringes at high-contrast boundaries in a photograph Purple fringing; Motion blur; Near-camera reflection, visual artifacts caused by the backscatter of light by unfocused particles
Photo demonstrating the rainbow effect present in single-chip DLP projectors. This is used in the article DLP projectors to illustrate the rainbow effect that can be seen when a single-chip projector is displaying a moving image. The photographer is waving his hand in front of a projector in a darkened room.
Test cards typically contain a set of patterns to enable television cameras and receivers to be adjusted to show the picture correctly (see SMPTE color bars).Most modern test cards include a set of calibrated color bars which will produce a characteristic pattern of "dot landings" on a vectorscope, allowing chroma and tint to be precisely adjusted between generations of videotape or network feeds.
Examples of pixel geometry, showing various arrangements of pixels and subpixels, which must be considered for subpixel rendering.LCD displays consisting of red, green, and blue subpixels (bottom right is the most typical example) are best suited to subpixel rendering.
This effect is not perceived only for the moving object, but the whole picture. Multi-color LED-based and laser-based single-chip projectors are able to eliminate the spinning wheel and minimize the rainbow effect, since the pulse rates of LEDs and lasers are not limited by physical motion.
The Rainbow Effect is significant only in DLP displays that use a single white lamp with a "color wheel" that is synchronized with the display of red, green and blue components. LED illumination systems that use discrete red, green and blue LEDs in concert with the display of red, green and blue components at high frequency reduce, or ...