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If you want to convert raster graphics (bitmap) to vector on Inkscape, you need to sharpen (also known as remap) the image. Fortunately, Inkscape has a built-in autofocus tool, so it won’t require any skill or huge chunks of time. For more fine-grained control over the strokes you take, you can use Inkscape’s built-in drawing tools to map by hand. No matter what you choose, Inkscape will also make the process of “vectorizing” bitmap images simpler.
Steps
Auto focus
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Import photos. Click “File” in the menu bar, then select “Import”.
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Open the stroke tool. To open Inkscape’s tracing tool, click “Path” in the menu bar and select “Trace Bitmap”. [1] X Research Source
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Choose between multiline and single stroke. Select “single” if you want to map a single stroke or “multiple” to make multiple overlaps on the image. [1] X Research Source
- Single stroke options:
- Brightness cutoff uses the hue of a pixel (pixel) to decide whether a stroke should be black or white. The higher the threshold setting, the darker the image will be. [1] X Research Source
- Edge detection creates focus based on the difference in brightness of pixels. Setting the threshold will determine the darkness of the output image. Again, the higher the threshold, the darker the output image will be.
- Cpor quantization creates strokes based on color differences. Setting “number of cpors” will give you the opportunity to specify the desired number of colors (if possible) in the output image. An algorithm is then used to turn those theoretical colors black or white.
- Multi-line options:
- Brightness steps allows you to specify the total number of ramps. [2] X Research Source
- Cpours (Colors) uses the number in the “Scans” box to determine the number of colors for the output image.
- Grays are like colors, but have shades based on grayscale.
- Additional options: The “Smooth” option will apply a Gaussian blur filter before mapping, and “Stack scans” will remove holes in the stroke coverage. [2] X Research Source Check “Remove background” to remove the background (usually the lightest color).
- Other options:
- “Suppress speckles” removes all spots, dust, distortion or other unwanted bits. [2] X Research Source
- “Optimize paths” merges Bezier curves.
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Click “Update” to see a preview. If the stroke is too bold or not prominent enough, it seems that you have selected the map mode that is not suitable for this type of image. Inkscape recommends that we use the three-stroke tool to determine the option that best suits our individual needs. [1] X Research Source
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Click OK to create the stroke. The bitmap image will be kept in the SVG file.
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Edit and refine the output image: Click the “Edit paths by nodes” button on the left (or press F2) to adjust the intersections and curves.
Manual stroke
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Import photos. Click “File” in the menu bar, then select “Import”.
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Open the Layers dialog box. While it’s technically not required to stroke the new layer, it will help you see what you’re doing through the options for adjusting the image’s transparency settings (or re-map) . Click “Layer” in the menu bar and select “Layers”. [3] X Research Sources
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Add new class. Click the “+” sign to add a new layer. Enter a name for the layer (such as “tracing layer”) and move it to the “Above current” position. Click “Add” to add. [4] X Research Sources
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Select the stroke tool. Inkscape has a variety of tools available to suit different needs.
- Press the F6 key on your keyboard (or click the pencil icon in the menu bar) to select the pencil/freehand tool. This tool will allow you to draw freely anywhere on the image. If you’re using a tablet, have solid skills, or your photos don’t have a lot of detail to trace, this tool is quite suitable.
- Press Shift+F6 simultaneously (or click the pen icon in the tools menu) to open the pen/Bezier tool. This tool allows you to create short, easy-to-manipulate strokes. If you have a lot of tracing or use the mouse, this tool will give the most detailed results. Finally, double-click the end of each line to end the stroke.
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Using a tablet or mouse, go back and forth in the image. If you choose the pen tool, you can use short strokes instead of a long continuous line. This makes the graphic easier to edit because you don’t have to draw long strokes over and over if you make a small mistake at the last minute.
- You can switch between layers in the Layers dialog box. Just double click on the class name that needs to be manipulated and you will switch to the view of that layer.
- When in focus, you can control how much or how little the bitmap blurs. With the layer selected in the dialog box, you can move the slider below the “Opacity” heading to see which setting works best.
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Open the “Edit Node” tool. In the tools menu, click the second down arrow button (the “edit” arrow) to activate edit mode. In this mode you will be able to click and drag the intersections to fine tune.
- If there are too many intersections and it takes time for you to get them in place, you can simplify the number of intersections. This will slightly change the shape of the line, but not by much. Use Ctrl + L ( Cmd + L on Mac) to reduce the number of intersections. [5] X Research Sources
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Review the graphic map without the bottom layer. To make sure you have traced all the lines you want in the vector image, click on the first layer (raster image) and reduce the opacity until only the lines you traced are left. If you find yourself missing a stroke, you can go back to the layer tool and increase the opacity so that the lines you need to trace appear.
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Remove the bottom layer and save the image. In the layer tool, you click on the first layer (the layer containing the original image) and delete it by clicking the minus icon. To save your graphic, click File and select Save As.
Advice
- Removing the background from the bitmap image before converting to vector will increase the quality of the stroke. [6] X Research Source Experts recommend that we use SIOX to remove fonts on bitmap images before starting to sharpen. [7] X Research Sources
- In general, bitmap images with multiple colors and gradients will require more precision than what the autofocus tool can do.
X
This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This article has been viewed 7,746 times.
If you want to convert raster graphics (bitmap) to vector on Inkscape, you need to sharpen (also known as remap) the image. Fortunately, Inkscape has a built-in autofocus tool, so it won’t require any skill or huge chunks of time. For more fine-grained control over the strokes you take, you can use Inkscape’s built-in drawing tools to map by hand. No matter what you choose, Inkscape will also make the process of “vectorizing” bitmap images simpler.
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