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Diffstat (limited to 'pnmnorm.html')
| -rw-r--r-- | pnmnorm.html | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/pnmnorm.html b/pnmnorm.html index 4bc2114e..b01b3f17 100644 --- a/pnmnorm.html +++ b/pnmnorm.html @@ -70,7 +70,7 @@ approximate the desired brightness. <li>saturation </ol> -In the case of saturation, "brightness" is pretty much a +In the case of saturation, "brightness" is pretty much a misnomer, but you can use the brightness analogy to see what it does. In the analogy, bright means saturated and dark means unsaturated. @@ -245,7 +245,7 @@ what property of the pixels <b>pnmnorm</b> normalizes. I.e., what kind of brightness. You cannot specify more than one of these. <P>The <B>-luminosity</B> option says to use the luminosity (i.e. the -"Y" in the YUV or YCbCr color space) as the pixel's brightness. The +"Y" in the YUV or YCbCr color space) as the pixel's brightness. The luminosity is a measure of how bright a human eye would find the color, taking into account the fact that the human eye is more sensitive to some RGB components than others. @@ -260,7 +260,7 @@ but its meaning was still the default. <P>Before Netpbm 10.28 (August 2005), there was no <B>-colorvalue</B> option. <P>The <B>-colorvalue</B> option says to use the color value (i.e. the -"V" in the HSV color space) as the pixel's brightness. The +"V" in the HSV color space) as the pixel's brightness. The color value is the gamma-adjusted intensity of the most intense RGB component. @@ -269,13 +269,13 @@ component. <P>Before Netpbm 10.28 (August 2005), there was no <B>-colorvalue</B> option. <p>The <b>-saturation</b> option says to use the saturation (i.e. the -"S" in the HSV color space) as the pixel's brightness. The +"S" in the HSV color space) as the pixel's brightness. The saturation is the ratio of the intensity of the most intense RGB component to the difference between the intensities of the most and least intense RGB component (all intensities gamma-adjusted). -<p>In this case, "brightness" is more of a metaphor than anything. -"bright" means saturated and "dark" means unsaturated. +<p>In this case, "brightness" is more of a metaphor than anything. +"bright" means saturated and "dark" means unsaturated. <p>This option is meaningless on grayscale images. |