So what this boils down to is the way LibreOffice handles different image formats. However since there's so much less image data, there's nothing to compress. LibreOffice will smooth the round and angular lines. You didn't put here an example of an imported SVG but if you blow it up it should show pretty much similar to the first image above. So a vector image is much simpler than a bitmap. Location is still two bytes for each pixel, but color only takes additional one byte - 4 x 2 + 1 byte = 9 bytes of image data. With these locations you define an area, and color to fill this area. If this image is a vector, you only need to specify the location of each corner. Let's assume one byte for x, one byte for y and one byte for color and we get 4 x 18 x 3 = 216 bytes of image data. If this image is a bitmap, you must specify individually the location and color of each pixel. The image above shows a simple black square, size 4x18 pixels, color black. A vector graphic will always look exactly the same whether you put it on a stamp or Hoover Dam. This is a completely different way of producing graphic, those you can upscale without any limitations. When you import an SVG, you import a vector graphic. This compression is done by LiberOffice itself. What you are pasting is a bitmap image, and compression causes loss of image data you lose grey values.
What causes the pixelation in paste is basically what TheKB says: compression. Because a pixel is a square, you cannot have any other smooth lines but perfectly horizontal and perfectly vertical, so font smoothing is used to trick viewer's brain. Sharing Documents With Microsoft Office Users A Comparable and (Mostly) Compatible Suite LibreOffice is the premier open-source office suite, and it's the default office package on most Linux distributions. This kind of font smoothing happens everywhere, it's a necessity. Collabora Onlines text document editor provides a true WYSIWYG. Because of this the image is not uniformly black and white, but some pixels have grey values. offers the most powerful Cloud, Mobile and Desktop Enterprise Office Suite. If the first one is an image in the first place, it's originally text data and the font has been smoothed. Blowing it up more with a graphic tool shows it more clearly: You can see clearly that if this is an image in the first place, it's low quality. Here's a blowup of the original image, ripped from here:
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