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First of all, its most common meaning is the third letter γ of the Greek alphabet, just like other Greek letters. It often appears in mathematical and physical formulas. Such as alpha rays, beta rays and gamma rays in high-energy physics.

Broadly speaking, testing has three traditional names, alpha(α), beta(β) and gamma(γ), which are used to identify the stage and scope of testing. Alpha refers to internal testing, that is, CB now, which refers to the internal testing version of the development team or the limited user experience test version. Beta(β) refers to the public beta, that is, the open beta version for all users. Then, after some modifications, it becomes the release candidate time for official release (now called RC-Release Candidate), which is called gamma(γ).

Then, γ is the unit that reflects the change of futures price, and it is the range of change. If the value of an option is 0.6 and the value of γ is 0.05, it means that the futures price rises by 1 yuan, resulting in an increase of 0.05, from 0.6 to 0.65. The γ value of flat option is the largest, while the γ value of deep real value or deep imaginary value option approaches 0. The greater the γ value, the faster the change speed and the higher the site risk.

The calculation of option theoretical price and risk parameters is complicated, and there are ready-made dynamic calculation results in Yisheng option analysis system. For investors, it is only necessary to know its meaning and usage.

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Gamma has different meanings in different contexts. One meaning refers to the transformation of the original signal, the other meaning refers to the measurement parameters of the transformation, and it can also refer to the specific concepts of the three concepts: display gray coefficient, system gray coefficient and file gray coefficient.

Reproduce gray scale

Is the physical property of the display, which is fixed, unchangeable and uncorrectable. Display gamma has different meanings in different contexts, one meaning refers to the distortion of the output image of the display to the input signal, and the other meaning refers to the specific value of this distortion.

File gamma

For a given digital photo file, according to the relevant standards and specifications, this gamma is a fixed value and does not need to be corrected. If a digital photo file has to change the gamma value because of some special needs, this change cannot be called "correction" but only "conversion".

Systematic gamma ray

The transformation represented by system gamma is the transformation of the computer system after reading the photo digital file and before outputting it to the display. For windows system, it exists in the graphics card, and it can be adjusted and corrected.

Gamma correction is always mentioned when using computer to process digital photos. What does the gamma correction process correct here?

Because the display gamma and file gamma are fixed, the gamma correction process is to correct the computer system gamma! , so that the superposition of display gamma, system gamma and file gamma is 1.0, so that the final display image is the same as the original scene without distortion.

It's like a password exchange. File gamma is an encryption process, while system gamma and display gamma are a reaction of file gamma and a decryption process, and the final result is the same as the original information.