Update color.qmd

color.qmd

@@ -10,7 +10,7 @@ We'll begin our study of color by describing the physical properties of
 light that lead to the perception of different colors. Then we'll
 describe how humans and machines sense colors, and how to build a system
 to match the colors perceived by an observer. We'll briefly describe how
-to represent color--different color coordinate systems. Finally, we'll
+to represent color---different color coordinate systems. Finally, we'll
 describe how spatial resolution and color interact.
 
 ## Color Physics
@@ -88,7 +88,7 @@ Why does the sky look blue? And why does it look orange during a sunset?
 ![](figures/color/sunset_key_west.jpg){width="80%"}
 :::
 
-@fig-examples1 shows a spectrograph visualization of some light power spectra (the right image of each row) along with the image that the spectrograph was pointed toward (left images). @fig-sources shows the spectrum of a blue sky, plotted as intensity as a function of wavelength.
+@fig-examples1 shows a spectrograph visualization of some light power spectra (the bottom image of each column) along with the image that the spectrograph was pointed toward (top images). @fig-sources shows the spectrum of a blue sky, plotted as intensity as a function of wavelength.
 
 :::{#fig-sources layout-ncol="2"}
 
@@ -116,7 +116,7 @@ Light with spectral power distributed in just the 400--500 nm wavelength band wi
 White light is a mixture of all spectral colors. A spectrum of light containing power evenly distributed over 400---700 nm would appear approximately white. Light with no power in any of those three bands, that is, darkness, appears black.
 
 There are three other spectral classes left in this simplified grouping of spectra: spectral power present in two of the spectral bands, but missing in the third. Cyan is a combination of both blue and green, or roughly spectral power between 400 and 600 nm. In printing and color film applications, this is sometimes called *minus red*, since it is the spectrum of white light, minus the spectrum of red light. The blue and
-red color blocks, or light in the 400--500 nm band, and in the 600--700nm band, is called magenta, or minus green. Red and green together, with spectral power from 500--700 nm, make yellow, or minus blue @fig-names.
+red color blocks, or light in the 400--500 nm band, and in the 600--700nm band, is called magenta, or *minus green*. Red and green together, with spectral power from 500--700 nm, make yellow, or *minus blue* @fig-names.
 
 ![For coarse orientation only, this cartoon model gives the color appearance of different spectral bands of the spectrum of visible light.](figures/color/cartoonColor2.png){#fig-names}
 
@@ -189,7 +189,7 @@ black and white.
 :::
 
 The human visual system analyzes the incident light power spectrum with
-only three different classes photoreceptors, called the L, M, and S
+only three different classes of photoreceptors, called the L, M, and S
 cones because they sample at the long, medium, and short wavelengths.
 This gives the human visual system a three-dimensional (3D) description
 of light, with each photoreceptor class taking a different weighted
@@ -332,7 +332,7 @@ given set of three primary lights, the strengths of each primary light
 can be adjusted to obtain a visual match to a desired color. There is
 one exception to this: because primary lights can only be combined in
 positive values, some input colors are outside the **gamut**---the range
-of colors that can be produced---of a the positive combination of a
+of colors that can be produced---of the positive combination of a
 given set of primary lights.
 
 The color reproduction system is then defined by two sets of spectral