Set Raster/Image Layer Properties

Usage

The Raster/Image group in the Layer Properties panel organizes functions related to property settings for raster and image layers, used to adjust the display effect of raster/image data. Relevant parameter settings can be performed only when the currently selected layer in the Layer Manager is an image or raster layer.

Function Entry

  • Scene tab -> Properties group -> Layer Properties button -> Layer Properties panel -> Raster/Image section
  • Layer Manager -> Image/Raster Layer context menu -> Layer Properties button -> Layer Properties panel -> Raster/Image section

Operation Steps

  1. In the Layer Manager, select a raster/image layer as the current layer.
  2. Click the Layer Properties button in the Properties group on the Scene tab, or right-click the current layer and select the Layer Properties button in the context menu. The Layer Properties setting panel pops up. In the Raster/Image section, set relevant parameters as needed.
  3. No-value settings can be performed only when the selected layer is an image dataset:
    • No Value (R,G,B): No value refers to pixel values in the image that have no actual meaning. You can directly enter RGB values in the text box to set the specified color as no value.
    • No Value Transparent: Used to set whether no-value areas are displayed transparently. After checking, no-value areas will be displayed transparently.
    • No Value Color: When "No Value Transparent" is not checked, you can check this item to specify the display color of no values. Click the drop-down button on the right, select a color from the color panel, and no-value pixels will be displayed in that color.
  4. Transparent Color Settings: Set a certain color of a raster/image layer in the scene as a transparent color, so that the area covered by that color becomes transparent. This effect needs to be used together with the two parameters "Transparent Color" and "Transparent Color Tolerance".

    • Transparent Color: Specify the color in the layer to be made transparent. After checking the Transparent Color checkbox, click the drop-down button on the right and select a color in the pop-up color panel as the color to be made transparent in the layer.

    • Transparent Color Tolerance: Set the color range close to the transparent color (0-255). For example, if the RGB value of the transparent color is (53, 99, 20) and the tolerance is set to 3, all pixels with RGB values between (50, 96, 17) and (56, 102, 23) will become transparent.
  5. Layer Transparency: Adjust layer transparency by directly entering a value or clicking the up and down arrows. The transparency value range is an integer from 0 to 100. The default value is 0 (completely opaque). The larger the value, the more transparent the layer; at 100, it is completely transparent.
  6. Multi-resolution Rendering: Check the Multi-resolution Rendering checkbox as needed. This function only takes effect for map tile or image tile layers, and is checked by default.
    • After checking, the system will use multi-resolution rendering to make the layer display smooth; if not checked, the system will use only one resolution to render the layer in the scene, and blank areas may appear at tile seams during browsing..
  7. Color Table Settings: When a raster dataset layer is selected, clicking the Settings button pops up the color table dialog box, in which you can adjust the hypsometric display effect of raster data. For color table setting operations, see the Color Table Settings Dialog Box document.
  8. Multi-band Display: Available only when the layer is an image dataset and the number of bands is ≥3. It is used to specify corresponding bands for red, green, blue, and optional transparent channels, thereby adjusting the color display effect of the image.
    • Color Mode: The drop-down list provides optional color modes, including RGB and RGBA. In RGB mode, display is performed by assigning appropriate bands to the R (red), G (green), and B (blue) channels; RGBA mode additionally adds an A (transparency) channel to control the transparency effect of the image. The intensity value range of each channel is 0–255
    • R/G/B/A: According to the selected color mode, select the band number corresponding to each channel in the drop-down box.
  9. The "Auto Apply" checkbox is checked by default: After settings are completed, the current layer displays the effect in real time. If not checked, you need to click the "Apply" button for the settings to take effect.
Notes:
  • The layer transparency setting button is available only when the selected layer is an image layer or a raster layer loaded as an image.
  • The Multi-resolution Rendering checkbox can be checked only when the selected layer is map tile or image tile data.
  • The Settings button is available only when the selected layer is a raster dataset.