
The Paint Bucket Tool in Paint Tool SAI is used to fill sections of colouring. The Magic Wand tool can be used to select the area around your line art, which will then turn blue. You can then outline the section with the colour of your choice and use the Paint Bucket Tool to fill in that part. If you are experiencing issues with binding the Paint Bucket Tool to a key, you may need to create an AutoHotKey script to address incompatibilities between your tablet and Paint Tool SAI.
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What You'll Learn

Using the Magic Wand tool to select outside the line art
The Magic Wand tool in Paint Tool SAI is a versatile selection tool with various modes and settings that can be used to select areas outside the line art. It offers three detection modes: Transparency (Strict), Transparency (Fuzzy), and Color Difference. The latter is the most useful for selecting outside the line art, as it allows you to choose a specific colour area or the entire coloured area.
To start, set the Magic Wand tool to "Color Difference" and adjust the "Color diff." bar to determine how strict the selection will be. This sensitivity adjustment is crucial when you want to select a specific colour area outside the line art without accidentally selecting other areas.
Once you have made your selection, you can use the "Invert" function to invert the selection, ensuring that only the areas outside the line art are selected. This step is crucial if you want to fill the selected areas with colour without affecting the line art.
Additionally, you can use the "Increment" tool to fine-tune your selection. By selecting outside your line art and clicking "Increment" a few times, you can make the selection bleed slightly into the line art. This technique can be useful when you want to ensure a smooth transition between the selected area and the line art.
The Magic Wand tool's ability to select outside the line art makes it a valuable tool for colouring and editing images in Paint Tool SAI. With its various settings and modes, you can make precise selections and adjustments to your artwork.
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Inverting the selection
To invert the selection, first ensure you are in “select mode”. You can check this by looking for the blue selected areas, which indicate that you are in select mode. Select mode is usually activated when using selection tools such as the Magic Wand or Selection/Deselection Brushes.
Once you are in select mode, use the Magic Wand tool to select the outside of your line art. Then, go to the Toolbars, select "Selection", and choose "Invert Selection". This will invert the selected areas, allowing you to fill the piece with a single basic colour.
By following these steps, you can effectively use the Invert Selection feature in Paint Tool SAI to select the outside of your image or layer and fill it with colour without experiencing colour bleeding.
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Filling the piece with a single basic colour
To fill a piece with a single basic colour in Paint Tool SAI, you can use the paint bucket tool. There are a few ways to do this, depending on your preferred workflow and the version of Paint Tool SAI you are using.
One method is to use the magic wand tool to select outside your line art, then invert the selection. You can then use the paint bucket tool to fill the piece with your chosen basic colour. This method is suitable for users who prefer to work with one layer.
Another method is to use the Layer -> Fill shortcut, which is Ctrl+Backspace by default. This shortcut will fill the layer with the foreground colour. If you want to use the paint bucket tool with settings similar to those in Version 1 of Paint Tool SAI, you can refer to the settings provided in the Imgur link in the comments of the Reddit post.
It is also possible to lock your base colour for your piece's line art by using the Purple 'Lock' Layer. This will prevent any new strokes outside of what is already present on the layer. Additionally, you can create new layers for different elements, such as skin and hair, to make it easier to fill the voids with colour.
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Outlining the section with the desired colour
To outline a section with the desired colour in Paint Tool SAI, you can follow these steps:
- First, select the desired colour for your outline. This can be done by choosing a colour from the colour palette or customising your own colour using the colour picker.
- Next, use the linework tool or the pen tool to draw an outline around the section you want to fill. This outline will serve as a boundary for the colour fill.
- Ensure that your outline overlaps slightly with your lineart to create a seamless appearance. This step is crucial to prevent gaps between your lineart and the colour fill.
- Once you have completed the outline, select the bucket tool and choose the desired colour for filling.
- Carefully click inside the outlined section with the bucket tool to fill it with the chosen colour. The colour should now be contained within the outlined area.
- If you are working on a complex drawing with multiple sections close to each other, you may need to adjust the gap tolerance settings to prevent the colour from spilling over into other areas. Experiment with different tolerance levels to achieve the desired result.
By following these steps, you can effectively outline and colour sections in Paint Tool SAI, creating vibrant and precise artwork.
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Using the bucket tool to fill in the section
To use the bucket tool to fill in sections of your colouring in Paint Tool Sai, start by selecting the Magic Wand tool and clicking on the area around your line art. The selected area will turn blue. Next, invert the selection and bucket fill the piece with a single basic colour. Then, take the colour you need and outline the section you want to fill in with that colour. Finally, use the bucket tool to fill in that section.
If you are working with multiple layers, it may be helpful to have separate layers for each character or element in your composition. This can be especially useful for busy and populated creations.
If you are working on a detailed image, you may encounter small areas that are difficult to fill with the bucket tool. In this case, you can try raising the Fill Bucket's threshold, but this may not always work. It may be easier to use the Pen Tool for these tiny areas.
It is worth noting that there have been reports of the bucket tool functioning differently in different versions of Paint Tool Sai. For example, one user reported that in Version 2, the bucket tool filled the entire page instead of filling inside the coloured outline, as it did in Version 1.
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Frequently asked questions
To bind a bucket to a key in Paint Tool SAI, you can use the Magic Wand tool to select the area around your line art. Then, you can use the bucket fill tool to fill in the selected area with colour.
The Fill Bucket tool is used to fill in sections of your colouring. You can use it to establish a base layer for your base colour and fill up white areas in tight corners.
If you're experiencing issues with the Paint Bucket tool, try adjusting the gap tolerance settings or raising the Fill Bucket's threshold. Alternatively, you can use the Pen Tool to fill in smaller areas.











































