1. Red-eyed red-eye is the phenomenon in which the eyes of the human eye appear red in the photo when the index camera shoots portraits in the flash mode. It can be understood that in a dark environment, the pupil of the human eye is enlarged. At this time, if the optical axis of the flash and the optical axis of the camera lens are relatively close, a strong flash light will be reflected into the lens through the fundus of the human eye, and the fundus is rich. The capillaries, these blood vessels are red, so they form a red light spot. Red-eye reduction is a function of the flash. It is pre-flashed before the official flash to reduce the pupil of the human eye and reduce the red-eye phenomenon.
2. Contrast Contrast refers to the measurement of different brightness levels between the brightest white and the darkest black in a light and dark region of an image. The larger the difference, the greater the contrast. The smaller the difference, the smaller the contrast is. A contrast ratio of 120:1 can easily display vivid, rich colors. When the contrast ratio reaches 300:1, colors of various levels can be supported. However, since the ratio suffers from the same predicament as the brightness, there is no effective and fair standard to measure the ratio. Therefore, the best way of identification is to rely on the user's eyes.
3, white balance that is white balance. The color of the object will change due to the color of the projected light. Photographs taken under different light conditions will have different color temperatures. For example, photographs taken in a lighting environment with a tungsten lamp (light bulb) may be yellowish. Generally speaking, ccd cannot correct the change of light automatically like the human eye. Therefore, by correcting the white balance, it will immediately adjust the intensity of the red, green and blue colors of the entire image according to the image quality in the current image to correct the error caused by the external light. Some cameras also provide manual white balance adjustments in addition to the design of automatic white balance or specific color temperature white balance functions.
4. Resolution A parameter used to measure the amount of data in the bitmap image. Usually expressed as ppi (pixels per inch). The more data that is included, the larger the length of the graphics file and the more detail that can be represented. But larger files also require more computer resources, more RAM, more hard disk space, and so on. On the other hand, if the image contains insufficient data (graphical resolution is low), it will appear quite rough, especially when the image is magnified to a larger size. So during image creation, we must determine the correct resolution based on the ultimate use of the image. The trick here is to first ensure that the image contains enough data to satisfy the final output. At the same time, it must also be appropriate, taking up as few computer resources as possible.
In general, "resolution" is expressed as the number of pixels in each direction, such as 640x480. In some cases, it can also be expressed as "pixels per inch" (ppi) and the length and width of the graphics. For example, 72ppi, and 8x6 inches.
Ppi and dpi (dots per inch) often appear mixed. From a technical point of view, "pixel" (p) exists only in the field of computer display, and "dot" (d) only appears in the printing or printing field. Please pay attention to the reader.
2. Contrast Contrast refers to the measurement of different brightness levels between the brightest white and the darkest black in a light and dark region of an image. The larger the difference, the greater the contrast. The smaller the difference, the smaller the contrast is. A contrast ratio of 120:1 can easily display vivid, rich colors. When the contrast ratio reaches 300:1, colors of various levels can be supported. However, since the ratio suffers from the same predicament as the brightness, there is no effective and fair standard to measure the ratio. Therefore, the best way of identification is to rely on the user's eyes.
3, white balance that is white balance. The color of the object will change due to the color of the projected light. Photographs taken under different light conditions will have different color temperatures. For example, photographs taken in a lighting environment with a tungsten lamp (light bulb) may be yellowish. Generally speaking, ccd cannot correct the change of light automatically like the human eye. Therefore, by correcting the white balance, it will immediately adjust the intensity of the red, green and blue colors of the entire image according to the image quality in the current image to correct the error caused by the external light. Some cameras also provide manual white balance adjustments in addition to the design of automatic white balance or specific color temperature white balance functions.
4. Resolution A parameter used to measure the amount of data in the bitmap image. Usually expressed as ppi (pixels per inch). The more data that is included, the larger the length of the graphics file and the more detail that can be represented. But larger files also require more computer resources, more RAM, more hard disk space, and so on. On the other hand, if the image contains insufficient data (graphical resolution is low), it will appear quite rough, especially when the image is magnified to a larger size. So during image creation, we must determine the correct resolution based on the ultimate use of the image. The trick here is to first ensure that the image contains enough data to satisfy the final output. At the same time, it must also be appropriate, taking up as few computer resources as possible.
In general, "resolution" is expressed as the number of pixels in each direction, such as 640x480. In some cases, it can also be expressed as "pixels per inch" (ppi) and the length and width of the graphics. For example, 72ppi, and 8x6 inches.
Ppi and dpi (dots per inch) often appear mixed. From a technical point of view, "pixel" (p) exists only in the field of computer display, and "dot" (d) only appears in the printing or printing field. Please pay attention to the reader.
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