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doc/filters/histogram: copyedit for grammar
There were a few grammar and spelling mistakes in this filter description. I went through it and corrected them without changing the meaning.
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@ -4937,8 +4937,8 @@ the histogram. Possible values are @code{none}, @code{weak} or
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Compute and draw a color distribution histogram for the input video.
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Compute and draw a color distribution histogram for the input video.
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The computed histogram is a representation of distribution of color components
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The computed histogram is a representation of the color component
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in an image.
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distribution in an image.
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The filter accepts the following options:
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The filter accepts the following options:
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@ -4949,41 +4949,38 @@ Set histogram mode.
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It accepts the following values:
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It accepts the following values:
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@table @samp
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@table @samp
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@item levels
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@item levels
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standard histogram that display color components distribution in an image.
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Standard histogram that displays the color components distribution in an
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Displays color graph for each color component. Shows distribution
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image. Displays color graph for each color component. Shows distribution of
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of the Y, U, V, A or R, G, B components, depending on input format,
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the Y, U, V, A or R, G, B components, depending on input format, in the
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in current frame. Bellow each graph is color component scale meter.
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current frame. Below each graph a color component scale meter is shown.
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@item color
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@item color
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chroma values in vectorscope, if brighter more such chroma values are
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Displays chroma values (U/V color placement) in a two dimensional
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distributed in an image.
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graph (which is called a vectorscope). The brighter a pixel in the
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Displays chroma values (U/V color placement) in two dimensional graph
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vectorscope, the more pixels of the input frame correspond to that pixel
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(which is called a vectorscope). It can be used to read of the hue and
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(i.e., more pixels have this chroma value). The V component is displayed on
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saturation of the current frame. At a same time it is a histogram.
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the horizontal (X) axis, with the leftmost side being V = 0 and the rightmost
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The whiter a pixel in the vectorscope, the more pixels of the input frame
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side being V = 255. The U component is displayed on the vertical (Y) axis,
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correspond to that pixel (that is the more pixels have this chroma value).
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with the top representing U = 0 and the bottom representing U = 255.
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The V component is displayed on the horizontal (X) axis, with the leftmost
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side being V = 0 and the rightmost side being V = 255.
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The U component is displayed on the vertical (Y) axis, with the top
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representing U = 0 and the bottom representing U = 255.
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The position of a white pixel in the graph corresponds to the chroma value
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The position of a white pixel in the graph corresponds to the chroma value of
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of a pixel of the input clip. So the graph can be used to read of the
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a pixel of the input clip. The graph can therefore be used to read the hue
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hue (color flavor) and the saturation (the dominance of the hue in the color).
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(color flavor) and the saturation (the dominance of the hue in the color). As
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As the hue of a color changes, it moves around the square. At the center of
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the hue of a color changes, it moves around the square. At the center of the
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the square, the saturation is zero, which means that the corresponding pixel
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square the saturation is zero, which means that the corresponding pixel has no
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has no color. If you increase the amount of a specific color, while leaving
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color. If the amount of a specific color is increased (while leaving the other
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the other colors unchanged, the saturation increases, and you move towards
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colors unchanged) the saturation increases, and the indicator moves towards
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the edge of the square.
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the edge of the square.
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@item color2
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@item color2
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chroma values in vectorscope, similar as @code{color} but actual chroma values
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Chroma values in vectorscope, similar as @code{color} but actual chroma values
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are displayed.
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are displayed.
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@item waveform
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@item waveform
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per row/column color component graph. In row mode graph in the left side represents
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Per row/column color component graph. In row mode, the graph on the left side
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color component value 0 and right side represents value = 255. In column mode top
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represents color component value 0 and the right side represents value = 255.
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side represents color component value = 0 and bottom side represents value = 255.
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In column mode, the top side represents color component value = 0 and bottom
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side represents value = 255.
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@end table
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@end table
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Default value is @code{levels}.
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Default value is @code{levels}.
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@ -4996,8 +4993,8 @@ Set height of color scale in @code{levels}. Default value is @code{12}.
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Allowed range is [0, 40].
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Allowed range is [0, 40].
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@item step
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@item step
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Set step for @code{waveform} mode. Smaller values are useful to find out how much
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Set step for @code{waveform} mode. Smaller values are useful to find out how
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of same luminance values across input rows/columns are distributed.
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many values of the same luminance are distributed across input rows/columns.
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Default value is @code{10}. Allowed range is [1, 255].
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Default value is @code{10}. Allowed range is [1, 255].
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@item waveform_mode
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@item waveform_mode
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@ -5016,26 +5013,25 @@ It accepts the following values:
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@table @samp
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@table @samp
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@item parade
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@item parade
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Display separate graph for the color components side by side in
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Display separate graph for the color components side by side in
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@code{row} waveform mode or one below other in @code{column} waveform mode
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@code{row} waveform mode or one below the other in @code{column} waveform mode
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for @code{waveform} histogram mode. For @code{levels} histogram mode
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for @code{waveform} histogram mode. For @code{levels} histogram mode,
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per color component graphs are placed one bellow other.
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per color component graphs are placed below each other.
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This display mode in @code{waveform} histogram mode makes it easy to spot
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Using this display mode in @code{waveform} histogram mode makes it easy to
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color casts in the highlights and shadows of an image, by comparing the
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spot color casts in the highlights and shadows of an image, by comparing the
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contours of the top and the bottom of each waveform.
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contours of the top and the bottom graphs of each waveform. Since whites,
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Since whites, grays, and blacks are characterized by
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grays, and blacks are characterized by exactly equal amounts of red, green,
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exactly equal amounts of red, green, and blue, neutral areas of the
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and blue, neutral areas of the picture should display three waveforms of
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picture should display three waveforms of roughly equal width/height.
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roughly equal width/height. If not, the correction is easy to perform by
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If not, the correction is easy to make by making adjustments to level the
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making level adjustments the three waveforms.
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three waveforms.
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@item overlay
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@item overlay
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Presents information that's identical to that in the @code{parade}, except
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Presents information identical to that in the @code{parade}, except
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that the graphs representing color components are superimposed directly
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that the graphs representing color components are superimposed directly
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over one another.
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over one another.
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This display mode in @code{waveform} histogram mode can make it easier to spot
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This display mode in @code{waveform} histogram mode makes it easier to spot
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the relative differences or similarities in overlapping areas of the color
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relative differences or similarities in overlapping areas of the color
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components that are supposed to be identical, such as neutral whites, grays,
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components that are supposed to be identical, such as neutral whites, grays,
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or blacks.
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or blacks.
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@end table
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@end table
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