레스터 속성 대화창¶

Layer Info¶

The General tab displays basic information about the selected raster, including the layer source path, the display name in the legend (which can be modified), and the number of columns, rows and no-data values of the raster.

Coordinate Reference System¶

Displays the layer’s Coordinate Reference System (CRS) as a PROJ.4 string. You can change the layer’s CRS, selecting a recently used one in the drop-down list or clicking on ^{Select CRS} button (see 좌표계 선택기). Use this process only if the CRS applied to the layer is a wrong one or if none was applied. If you wish to reproject your data into another CRS, rather use layer reprojection algorithms from Processing or Save it into another layer.

밴드 렌더링¶

QGIS는 서로 다른 Render types 4개를 제공하고 있습니다. 데이터 유형에 따라 렌더링 작업자가 선택됩니다.

1. Multiband color - if the file comes as a multiband with several bands (e.g., used with a satellite image with several bands)
2. Paletted - if a single band file comes with an indexed palette (e.g., used with a digital topographic map)
3. Singleband gray - (one band of) the image will be rendered as gray; QGIS will choose this renderer if the file has neither multibands nor an indexed palette nor a continuous palette (e.g., used with a shaded relief map)
4. Singleband pseudocolor - this renderer is possible for files with a continuous palette, or color map (e.g., used with an elevation map)

Multiband color

With the multiband color renderer, three selected 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. You can choose several Contrast enhancement methods: ‘No enhancement’, ‘Stretch to MinMax’, ‘Stretch and clip to MinMax’ and ‘Clip to min max’.

Raster Style - Multiband color rendering

This selection offers you a wide range of options to modify the appearance of your raster layer. First of all, you have to get the data range from your image. This can be done by choosing the Extent and pressing [Load]. QGIS can Estimate (faster) the Min and Max values of the bands or use the Actual (slower) Accuracy.

Now you can scale the colors with the help of the Load min/max values section. A lot of images have a few very low and high data. These outliers can be eliminated using the Cumulative count cut setting. The standard data range is set from 2% to 98% of the data values and can be adapted manually. With this setting, the gray character of the image can disappear. With the scaling option Min/max, QGIS creates a color table with all of the data included in the original image (e.g., QGIS creates a color table with 256 values, given the fact that you have 8 bit bands). You can also calculate your color table using the Mean +/- standard deviation x . Then, only the values within the standard deviation or within multiple standard deviations are considered for the color table. 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.

All calculations can also be made for the Current extent.

Paletted

팔레트 렌더링 작업자는 이미 색상표를 포함하고 있는 단일 밴드 파일을 위한 표준 렌더링 옵션입니다. 이 색상표는 각 픽셀 값을 특정 색상에 할당한 표입니다. 이런 경우, 팔레트를 자동적으로 렌더링합니다. 특정 값에 할당된 색상을 변경하고 싶다면, 해당 색상을 더블클릭하면 Select color 대화창이 열립니다. 또한, QGIS는 색상값에 라벨을 적용할 수도 있습니다. 이 라벨은 래스터 레이어 범례에 표시됩니다.

Raster Style - Paletted Rendering

대조 개선

Singleband gray

This renderer allows you to render a single band layer with a Color gradient: ‘Black to white’ or ‘White to black’. You can define a Min and a Max value by choosing the Extent first and then pressing [Load]. QGIS can Estimate (faster) the Min and Max values of the bands or use the Actual (slower) Accuracy.

Raster Style - Singleband gray rendering

With the Load min/max values section, scaling of the color table is possible. Outliers can be eliminated using the Cumulative count cut setting. The standard data range is set from 2% to 98% of the data values and can be adapted manually. With this setting, the gray character of the image can disappear. Further settings can be made with Min/max and Mean +/- standard deviation x . While the first one creates a color table with all of the data included in the original image, the second creates a color table that only considers values within the standard deviation or within multiple standard deviations. 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.

Singleband pseudocolor

이 렌더링 작업자는 연속적인 팔레트를 포함하는 단일 밴드 파일 용 렌더링 옵션입니다. 이 작업자는 단일 밴드에 대한 개별 색상 맵을 생성할 수도 있습니다.

Raster Style - Singleband pseudocolor rendering

Three types of color interpolation are available:

1. Discrete

2. 선형(Linear)

3. Exact

In the left block, the button ^{Add values manually} adds a value to the individual color table. The button ^{Remove selected row} deletes a value from the individual color table, and the ^{Sort colormap items} button sorts the color table according to the pixel values in the value column. Double clicking on the value column lets you insert a specific value. Double clicking on the color column opens the dialog Change color, where you can select a color to apply on that value. Further, you can also add labels for each color, but this value won’t be displayed when you use the identify feature tool. You can also click on the button ^{Load color map from band}, which tries to load the table from the band (if it has any). And you can use the buttons ^{Load color map from file} or ^{Export color map to file} to load an existing color table or to save the defined color table for other sessions.

In the right block, Generate new color map allows you to create newly categorized color maps. For the Classification mode ‘Equal interval’, you only need to select the number of classes and press the button Classify. You can invert the colors of the color map by clicking the Invert checkbox. In the case of the Mode ‘Continuous’, QGIS creates classes automatically depending on the Min and Max. Defining Min/Max values can be done with the help of the Load min/max values section. A lot of images have a few very low and high data. These outliers can be eliminated using the Cumulative count cut setting. The standard data range is set from 2% to 98% of the data values and can be adapted manually. With this setting, the gray character of the image can disappear. With the scaling option Min/max, QGIS creates a color table with all of the data included in the original image (e.g., QGIS creates a color table with 256 values, given the fact that you have 8 bit bands). You can also calculate your color table using the Mean +/- standard deviation x . Then, only the values within the standard deviation or within multiple standard deviations are considered for the color table.

색상 렌더링¶

모든 Band rendering 에 대해, Color rendering 도 할 수 있습니다.

혼합 모드 가운데 하나를 사용해서 사용자 래스터 파일(들)에 특별 렌더링 효과를 줄 수도 있습니다. (혼합 모드 를 참조하세요.)

Brightness 옵션으로 명도를, Saturation 옵션으로 채도를, Contrast 옵션으로 대조를 조정해서 색상을 심화 설정할 수도 있습니다. 또 Grayscale 옵션도 사용할 수 있는데, ‘By lightness’, ‘By luminosity’ 및 ‘By average’ 가운데 하나를 선택할 수 있습니다. 색상표에 있는 색채(hue) 하나를 선택한 다음 해당 색채의 Strength 를 조정할 수 있습니다.

리샘플링¶

Resampling 옵션은 사용자가 이미지를 확대/축소하는 경우 나타납니다. 리샘플링 모드로 맵의 모습을 최적화할 수 있습니다. 리샘플링 모드들은 기하학적 변형을 통해 새 회색조 값 매트릭스를 생성합니다.

Raster Style - Color rendering and Resampling settings

‘Nearest neighbour’ 방법을 적용하면, 확대 시 맵의 픽셀이 두드러져 보일 수 있습니다. ‘Bilinear’ 또는 ‘Cubic’ 방법을 사용하면 이 모습을 향상시킬 수 있는데, 이 방법들은 뚜렷한 피처를 흐릿하게 만듭니다. 이 블러 효과로 더 부드러운 이미지를 생성할 수 있습니다. 이 방법들은, 예를 들자면 래스터 수치지형도에 적용할 수 있습니다.

At the bottom of the Style tab, you can see a thumbnail of the layer, its legend symbol, and the palette.