This is a very handy tool if one needs to deliver a single final image built from separate individual ones.
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The merge tool is a data fusion tool which allows one to merge multiple selected images into a single new image with a specified resolution and various option for how to merge overlapping cells from multiple surfaces. Switch RGB/Greyscale Mode Clear Transparency Channel This operation provides a tool for resampling an image to a different resolution based on several methods. If you have a selection drawn on the surface the Crop operation will create a new GeoImage object with any data outside of the selection removed. You can see the results by change the Mask By attribute to Raster which eliminates any image pixels whose alpha value is 0 (i.e transparent). This operation lets you knock a hole in the selected image based on any other surfaces that are visible in the scene by setting any overlapping pixels transparency to 100%. It will result in a new surface being produced that can be displayed in the current Scene. As images don't dynamically auto-project if you want to see this object in the current scene's CRS than one can use this option. If an object is current marked as Undisplayable in the Scene control dock this is normally because it is in a different projection than the scene is. The Reproject Object option will produce a new surface by transforming the existing one into the new projection you have chosen then adds the result to the current scene. Generally there are better ways to handle (re)projection work but if you really just want to convert this image into a new projection this will work. No projection is done here you are just telling it that this new coordinate system is what the object should have been in in the first place. While this should be very rarely needed it can be used if necessary to change the coordinate system currently applied to the object. These operations include: Change Object Coordinate System. To see the operations available for the surface object type right click the object's name and look in the Operations sub-menu or look at the Operations dropdown menu at the bottom left of the attribute panel.
The Fuzziness slider works with the mask by color option to make it so it selects similar colors to the set mask color widening the mask selection based on the slider bars value. This will bring up a dialog to select the color and a control to pick the color from the scene if desired. To set the mask color click on the Mask Color option below the Mask By control. The mask by Color makes it trivial to select the white background and remove it from the image displayed. For example you may have a chart which normally has a white background.
This is done dynamically and does not actually modify the imagery data. The final Color option allows for some simple dynamic masking where you can select a color and have any part of the image with the same color have its pixel hidden. An alpha value of zero means to mask (hide) the pixel, whereas the default 255 value means show the pixel. When Raster is selected any pixels in the image whose alpha value is zero will not be rendered allowing one to mask out portions of the image. When None is selected all the image's pixels are displayed. The Mask By option includes None, Color, and Raster options. The Height operation specifies the vertical (Z) position of the image.
The Transparency slider applies the percentage of transparency to the whole GeoImage object allowing data from objects behind the image to blend with the Image. The pixel resolution (pixels are square). The number of rows of pixels in the image. The number of columns of pixels in the image.
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