Raster image layer Raster configuration

• Raster image layer, used to load image maps. For details, please refer to "Background layer Background:1.2";
• Add the data source. If the data source already exists, ignore this step. For details, refer to "Cartography Prerequisite: 2";
• The "∑" button behind the parameter value can realize numerical changes at different levels. For details, please refer to "Icon Point Layer Symbol: 3.3.2";
• The "fx" button behind the parameter value can convert the parameter information into an expression. For details, please refer to "Icon Point Layer Symbol: 3.3.3";

1. Layer Properties module

The "Layer Properties" module is used to adjust the layer data source, data type, display level, etc. For details, please refer to "Background layer Background: 1".

1.1. Set layer type

• Change "Type" to "Raster", change "Source Layer", set "Min Zoom" and "Max Zoom";

2. "Filter" module

"Filter conditions" module, keep the default;

3. "Drawing Properties" module

"Drawing Properties" module, set image transparency, hue, brightness, saturation and other parameters;

3.1. "Opacity" parameter setting

• "Opacity" parameter, modify image transparency;

3.2. "Hue rotate" parameter settings

• "Hue rotate" parameter, modify the image hue;

3.3. "Brightness min" and "Brightness max" parameter settings

• "Brightness min", "Brightness max" parameters, modify the maximum brightness and minimum brightness parameter values ​​of the image, the value range is 0-1;

3.4. "Saturation" parameter setting

• "Saturation" parameter, modify the saturation of the image;

3.5. "Contrast" parameter setting

• "Contrast" parameter, modify the image contrast;

3.6. "Fade duration" parameter setting

• "Fade duration" parameter, modify the tile disappearing time;

3.7. "Resampling" parameter setting

• "Resampling" parameter, modify the tile resampling method;