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Like other image editing software such as Gimp or Photoshop , Krita has similar tools to remove the background of an image non-destructively using transparency masks. The following steps show how: Open up an image in Krita . In the Layers pane on the right, mouse right click on the paint layer. A pop up menu appears . Choose Add | Transparency Mask . A transparency mask sub layer is created underneath the paint layer . Draw a selection polygon roughly around the foreground object in the image using the Polygonal Selection Tool , as shown below. Then in the File menu, click Select | Invert Selection . Choose Black as the foreground color. Choose a Brush e.g. Basic-1 Ink . Make sure the transparency mask layer is selected or active. Then paint over the background. Choose Select | Deselect to remove the selection polygon. The marching ants selection polygon is removed . Make the brush size smaller and zoom closer  to the background - foreground boundary. Brush over the r

I made this free colorful abstract geometrical background and published it on the OpenClipart site. Click here  https://openclipart.org/detail/318138/abstract-colorful-geometric-background  to download.

The usual way to color line art drawings in digital image manipulation software is to use a Color Fill tool to fill an area bounded by line work. Krita has a useful tool called the Colorize Mask Editing Tool which allows you to simply draw a patch inside the line work with the color you want to fill. Once all the color patches have been drawn, you could preview the color fill and if everything is to your satisfaction, you can just click a button to save the color fill permanently. The following steps illustrate: Start Krita . Open up a line work drawing e.g. christmas_tree.svg . Then in the main tool bar, click the Colorize Mask Editing Tool , as highlighted in a red circle in the screenshot above. Then click on the drawing. The line work becomes transparent . A new Colorize Mask layer is created . If a brush is not selected, then choose a brush e.g. Basic-1 . Adjust the brush size if necessary. Then use the Advanced Color Selector pane to choose the desired color for the