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- M8 image and tracing tools
I need to trace part of an image in M8.0.30, but all tracing tools expect the colour selection button are greyed out. Likewise the colour selection tool when I make the image the active layer. Also, opening the image directly (as in, not in a map) in Manifold doesn't provide any tools either.
The image is stored locally within the project, and together with a drawing is the only layer in the map.
I *think* I'm doing everything as per the help doc - can anyone offer any guidance?
It is also very helpful to have the Tool Properties Pane open as well. The default value tolerance is set to 5. I find that this value should be set higher to take into account subtle changes in color values in an image. I usually accomplish my goal through trial-and-error until I find a tolerance value that allows me to trace the thing I want. Most recently, I needed a drawing layer of a very large stormwater pond. This pond is not included on any of the government GIS sites where I usually get my data. I georeferenced an image saved from Google Earth Pro and use that image to trace the area of the stormwater pond. On screen, the pond appears to be a dark brownish-green color surrounded by tan-colored vegetation. However, the pond's color at the pixel level includes many different values and chroma of dark green. I believe I set the Tolerance Value to 30 in order to capture all of the stormwater pond. I then simplified the resultant area to get rid of the edge noise.
The downside of this process is that it can take M8 quite a while to trace a large image.
Thanks for the responses - turns out I missed the help topic statement that tracing tools don't work with compressed images.