10-21-2017, 10:51 PM
Quality of image is a problem. There are compression artifacts (chroma subsampling quartered means that black isn't black), and it has been rescaled. If you really want a clean result it has to be redone, but even though there is no silver bullet it is not such a daunting task. So IHMO you best course of action:
If you use paths, once you have rescaled the picture to a multiple of 49x49 you can also use Inkscape to create a SVG file.
- Rescale the image to a multiple of 49x49 (for instance, 588x588 (12*49), but if you need a bigger image, go for it...)
- Using Image>Configure grid create a 12x12 grid that marks the intersections. Make the grid "snappy" using View>Snap to grid.
- Using either the freehand selection (
) in "polygon mode" (ie, click, move, click....) or the path tool ( 
), make selection around the yellow and orange shapes. The grid will make it very to click on the corners of the squares. You can work without stress if you follow these hints.
- Create a layer that you fill with the purple.
- Add (see link above) the selections for each color and bucket-fill
- Using paths instead of a plain selection allows you to resize the picture and still get sharp shapes. Resize the picture and repeat step 4 and 5.
If you use paths, once you have rescaled the picture to a multiple of 49x49 you can also use Inkscape to create a SVG file.