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Originally Posted by Dutch
A complementary program for Unix, Windows and Linux, which is also freeware GPL, that I can recommend, is ImageMagick, which is a commandline utilty to convert among others SVG files to whatever format you like.
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I've tried it. It was an enormous pain to install, and then, finally, it ALMOST worked. It seems that ImageMagick supports almost everything in the SVG specification except the "opacity" attribute. And that's a big deal; most GPS Visualizer output looks terrible if the background map is at full strength. And overlapping waypoints would also look bad if they were all 100%. So for now, screen shots or the "Copy SVG" contextual menu item give much better results.
Another problem with me making ImageMagick available through my server is that some of the background maps come from copyrighted sources, and if I have a program on my site that actually merges those images into a new GIF or JPEG, I feel like I'm on shakier legal ground than with an SVG that just links to the image. (Of course, if people want to take their OWN screen shots or use ImageMagick, that's none of my business.) If I ever do find a workable rasterizer, I'll have to allow only certain background maps to be rasterized, and the fancy European street maps would NOT be on the list.
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Originally Posted by The Others
I can't remember what it's called, but, I was under the impression that this was already doable on the GPSvisualiser site.
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No, the "localizer" function on the GPSV site just strips out some extra JavaScript from the SVG and changes the background link to a local file name, so you can save the background once and then you don't have to pull it off the remote server anymore. The output is still an SVG.