Linux command
ppmgamma 命令
文本
涉及管道、覆盖或删除，执行前请先确认路径和参数。
常用示例
Apply gamma correction
ppmgamma [2.2] [input.ppm] > [output.ppm]
Lighten image
ppmgamma [0.5] [input.ppm] > [output.ppm]
Darken image
ppmgamma [2.0] [input.ppm] > [output.ppm]
Per-channel gamma
ppmgamma [1.0] [1.2] [1.0] [input.ppm] > [output.ppm]
说明
ppmgamma applies gamma correction to a PPM image. Gamma < 1 lightens the image, gamma > 1 darkens it. Each pixel value is raised to the power of 1/gamma. Part of Netpbm toolkit.
参数
- gamma
- Gamma value for all channels.
- rgamma, ggamma, bgamma
- Per-channel gamma values.
FAQ
What is the ppmgamma command used for?
ppmgamma applies gamma correction to a PPM image. Gamma < 1 lightens the image, gamma > 1 darkens it. Each pixel value is raised to the power of 1/gamma. Part of Netpbm toolkit.
How do I run a basic ppmgamma example?
Run `ppmgamma [2.2] [input.ppm] > [output.ppm]` in a terminal, then adjust file names, paths, flags, or remote targets for your system.
What does gamma do in ppmgamma?
Gamma value for all channels.