「Raster Properties Dialog:Symbology」の版間の差分
(ページの作成: <H3> Symbology Tab </H3> <P> QGIS can render raster layers in two different ways :<A NAME="63"></A> <P> <UL> <LI>Single band - one band of the image will be rendered as gray o…) |
([Raster Properties Dialog:Symbology]箇所のタグ調整、Tip 23追加(Tipは暫定対処、要Template化)) |
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| − | + | ==Symbology Tab== | |
| − | Symbology Tab | + | |
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| − | + | QGIS can render raster layers in two different ways : | |
| − | QGIS can render raster layers in two different ways : | + | |
| − | + | *Single band - one band of the image will be rendered as gray or in pseudocolors. | |
| + | *Three band color - three bands from the image will be rendered, each band representing the red, green or blue component that will be used to create a color image. | ||
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Within both render types you can invert the color output using the | Within both render types you can invert the color output using the | ||
| − | Invert color map checkbox. | + | {{Template:CheckBox|Invert color map}} checkbox. |
| − | + | ===Single Band Rendering=== | |
| − | Single Band Rendering | + | |
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This selection offers you two possibilites to choose. At first you can | This selection offers you two possibilites to choose. At first you can | ||
select which band you like to use for rendering (if the dataset has more than | select which band you like to use for rendering (if the dataset has more than | ||
one band). | one band). | ||
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The second option offers a selection of available colortables for rendering. | The second option offers a selection of available colortables for rendering. | ||
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The following settings are available through the dropdownbox | The following settings are available through the dropdownbox | ||
| − | color | + | {{Template:SelectString|color map|Grayscale}}, where grayscale is the default |
setting. | setting. | ||
Also available are | Also available are | ||
| − | + | *Pseudocolor | |
| − | + | *Freak Out | |
| − | + | *Colormap | |
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| − | + | When selecting the entry {{Template:SelectString|color map|Colormap}}, the tab | |
| − | When selecting the entry color | + | {{Template:Tab|Colormap}} becomes available. See more on that at chapter |
| − | Colormap becomes available. See more on that at chapter | + | [[Raster Properties Dialog:Colormap|6.3.3]]. |
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QGIS can restrict the data displayed to only show cells whose values are | QGIS can restrict the data displayed to only show cells whose values are | ||
within a given number of standard deviations of the mean for the | within a given number of standard deviations of the mean for the | ||
| − | layer. | + | layer. This is useful when you have one or |
two cells with abnormally high values in a raster grid that are having a | two cells with abnormally high values in a raster grid that are having a | ||
negative impact on the rendering of the raster. This option is only available | negative impact on the rendering of the raster. This option is only available | ||
for pseudocolor images. | for pseudocolor images. | ||
| − | + | ===Three band color=== | |
| − | Three band color | + | |
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This selection offers you a wide range of options to modify the appereance | This selection offers you a wide range of options to modify the appereance | ||
of your rasterlayer. For example you could switch color-bands from the | of your rasterlayer. For example you could switch color-bands from the | ||
standard RGB-order to something else. | standard RGB-order to something else. | ||
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Also scaling of colors are available. | Also scaling of colors are available. | ||
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| + | ---- | ||
| + | Tip 23 VIEWING A SINGLE BAND OF A MULTIBAND RASTER | ||
| + | ---- | ||
| + | If you want to view a single band (for example Red) of a multiband image, you might think you would set the | ||
| + | Green and Blue bands to “Not Set”. But this is not the correct way. To display the Red band, set the image | ||
| + | type to grayscale, then select Red as the band to use for Gray. | ||
| + | ---- | ||
2009年9月9日 (水) 00:38時点における版
Symbology Tab
QGIS can render raster layers in two different ways :
- Single band - one band of the image will be rendered as gray or in pseudocolors.
- Three band color - three bands from the image will be rendered, each band representing the red, green or blue component that will be used to create a color image.
Within both render types you can invert the color output using the
Invert color map checkbox.
Single Band Rendering
This selection offers you two possibilites to choose. At first you can select which band you like to use for rendering (if the dataset has more than one band).
The second option offers a selection of available colortables for rendering.
The following settings are available through the dropdownbox
color map Grayscale 
, where grayscale is the default
setting.
Also available are
- Pseudocolor
- Freak Out
- Colormap
When selecting the entry color map Colormap , the tab
Colormap becomes available. See more on that at chapter
6.3.3.
QGIS can restrict the data displayed to only show cells whose values are within a given number of standard deviations of the mean for the layer. This is useful when you have one or two cells with abnormally high values in a raster grid that are having a negative impact on the rendering of the raster. This option is only available for pseudocolor images.
Three band color
This selection offers you a wide range of options to modify the appereance of your rasterlayer. For example you could switch color-bands from the standard RGB-order to something else.
Also scaling of colors are available.
Tip 23 VIEWING A SINGLE BAND OF A MULTIBAND RASTER
If you want to view a single band (for example Red) of a multiband image, you might think you would set the Green and Blue bands to “Not Set”. But this is not the correct way. To display the Red band, set the image type to grayscale, then select Red as the band to use for Gray.
