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pages.zh/common/pnmgamma.md
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pages.zh/common/pnmgamma.md
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# pnmgamma
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> 对PNM图像执行伽玛校正。
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> 更多信息:<https://netpbm.sourceforge.net/doc/pnmgamma.html>。
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- 将图像从BT.709亮度转换为辐射或sRGB亮度:
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`pnmgamma -{{bt709tolinear|bt709tosrgb}} {{path/to/image.pnm}} > {{path/to/output.pnm}}`
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- 将图像从辐射或sRGB亮度转换为BT.709亮度:
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`pnmgamma -{{lineartobt709|srgbtobt709}} {{path/to/image.pnm}} > {{path/to/output.pnm}}`
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- 指定用于伽玛转换函数的伽玛值:
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`pnmgamma -gamma {{value}} {{path/to/image.pnm}} > {{path/to/output.pnm}}`
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- 指定每个颜色分量用于伽玛转换函数的伽玛值:
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`pnmgamma -rgamma {{value}} -ggamma {{value}} -bgamma {{value}} {{path/to/image.pnm}} > {{path/to/output.pnm}}`
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