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You can still use Dropper tool, but you would use it to set the gradient stops. If it's a gradient which includes transparency, it might be a lot harder to "fix", depending on how complex the gradient is. If it's a solid but partially transparent fill, you can use the Dropper tool. Once you identify the objects, it depends on how transparency is used. And you'll also need to check the Opacity level, which needs to be 100%. It's hard to see the checkerboard though, if it contains only a tiny bit of transparency, and in that case you can open the Fill and Stroke dialog and check the A (alpha) value. If either the Fill or Stroke show any checkerboard pattern, that indicates it contains some transparency. Or once you open the SVG, you can select each object, and look in the bottom left corner of the window. One clue for which objects contain transparency, is which objects look rasterized after saving as EPS. It's hard to know without seeing the image though. But in some, and probably many cases it could negatively impact the image. If it does contain transparency, we can tell you how to get rid of it.
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But if you want to upload the SVG somewhere and give us a link (or attach to next reply) we could look at it for you. Hhhm.I'm not quite clear how you could not know what transparency is in the image, if you created it.
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