
Paint Tool SAI is a lightweight Japanese digital painting program that is popular among artists due to its simplicity and vast range of tools. The program offers a variety of selection tools, including the Dilate Selection 1px feature, which allows users to increase the size of their selection. This tool can be particularly useful when coupled with the “Increment” tool, which can help create borders and prevent colour leakage. Additionally, Paint Tool SAI provides built-in textures, transformation tools, and the ability to modify tools to suit the user's needs.
| Characteristics | Values |
|---|---|
| Name of the tool | Dilate Selection 1px |
| What it does | Increases the size of the selection |
| Opposite tool | Erode Selection 1px (shrinks the selection by 1px) |
| Other similar tools | Invert, Increment |
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What You'll Learn

Use the Dilate Selection 1px function to dilate a selection
Paint Tool SAI is a lightweight Japanese digital painting program that is popular among artists due to its simplicity and vast range of tools. The Dilate Selection 1px function is one such tool that can be used to dilate a selection.
To use the Dilate Selection 1px function in Paint Tool SAI, follow these steps:
- Make sure you have a selection to work with. You can create a selection using the various selection tools available in Paint Tool SAI, such as the Rectangle Selection tool, Lasso tool, or Magic Wand tool.
- With your selection in place, locate the "Dilate Selection 1px" option. In older versions of Paint Tool SAI, this option was found under the \"Outline\" sub-menu in the "Brush Tools" menu. However, in newer versions, it may be located under the \"Selection\" menu.
- Click on "Dilate Selection 1px" to activate the function. This will increase the size of your selection by 1 pixel.
- If needed, you can continue to select "Dilate Selection 1px" multiple times to expand the selection further. Each click will increase the size by an additional 1 pixel.
- To fine-tune your selection, you can also explore the \"Erode Selection 1px\" function. This will shrink the selection by 1 pixel, allowing for more precise adjustments.
Remember that the Dilate Selection 1px function is a useful tool for incrementally increasing the size of your selection. It can be particularly helpful when creating borders or making slight adjustments to your artwork.
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The Increment tool can be used to dilate a selection
Paint Tool SAI is a lightweight Japanese digital painting program that is popular among artists due to its simplicity and vast range of tools. One such tool is the Increment tool, which can be used to dilate a selection.
The Increment tool is used to increase the size of a selection. This can be useful if you need to make a selection bigger without having to start over. To use the Increment tool, simply make your initial selection and then click Increment a few times until you reach the desired size.
In Paint Tool SAI2, the Increment tool can be found under the name "Dilate Selection 1px" in the "Selection" menu. This tool allows you to increase the size of your selection by 1 pixel at a time. SAI2 also introduces a new tool that does the opposite of the Increment tool, shrinking the selection by 1px.
The Increment tool can be especially useful when coupled with the "Invert" tool. By selecting the outside of your artwork and then inverting it, you can use the Increment tool to slightly bleed into the line art. This can help prevent color bleeding when you invert the selection again.
Overall, the Increment tool is a handy feature in Paint Tool SAI that allows you to easily dilate a selection, making it bigger without having to start from scratch.
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The Invert tool can be used in conjunction with Increment
Paint Tool SAI has a variety of selection tools that can be used to edit images. One such tool is the "Invert" tool, which allows users to invert a selection. This tool can be used in conjunction with the "Increment" tool to create unique effects and improve the overall editing process.
The "Invert" tool is relatively straightforward, allowing users to select an area and then invert it. This means that the selected area becomes the unselected area, and vice versa. While this may seem like a simple function, it can be quite useful when combined with other tools that Paint Tool SAI offers.
One such tool that works well with "Invert" is the "Increment" tool. The "Increment" tool allows users to increase the size of their selection by 1px, as indicated by the function "Dilate Selection 1px" under the "Selection" menu. By using the "Increment" tool in conjunction with "Invert," users can create more precise and accurate selections.
For example, let's say a user wants to select the outside of a piece of lineart and then invert the selection. Without using the "Increment" tool, the color may bleed through the selection, causing an undesirable effect. However, by using the "Increment" tool a few times before inverting, the selection will bleed slightly into the lineart, and inverting it at this stage will prevent the color from bleeding through.
This technique is especially useful when creating borders or working with detailed images where precise selections are crucial. The "Increment" tool allows for better control over the selection size, ensuring that the desired areas are included or excluded from the selection.
In conclusion, the "Invert" tool in Paint Tool SAI can be effectively used alongside the "Increment" tool to create more precise and controlled selections. By increasing the selection size slightly before inverting, users can avoid issues like color bleeding and achieve their desired editing outcomes. This combination of tools showcases the versatility and power of Paint Tool SAI's selection capabilities.
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The Magic Wand tool has 3 selection modes
The Magic Wand tool is your best friend when it comes to selecting things in Paint Tool Sai. It has three selection modes, each with its own unique functionality:
Transparency (Strict)
This mode selects the transparent region surrounded by lines. If the pixel's transparency falls within the range of the "Transp diff." parameter, these pixels are treated as transparent. While this mode can be useful for roughly sketched images, it may not be effective if the image is too rough.
Transparency (Fuzzy)
Similar to the previous mode, this one selects the transparent region surrounded by lines but with a fuzzier selection. This mode is more forgiving and can be useful for selecting transparent regions in images with varying levels of transparency.
Color Difference
This mode is the most versatile and useful for most situations. It allows you to select regions based on their color. By adjusting the "Color diff." bar, you can control how strict the color selection is. This is extremely handy when you need to select a specific colored area or when you want to select all areas of a particular color.
In addition to these three selection modes, the Magic Wand tool also offers target modes: "Working Layer," "Selection Source," and "All Image." These modes determine which layers the Magic Wand tool selects from. "Working Layer" is the default mode, only selecting from the active layer. "All Image" selects from all visible layers, and "Selection Source" is a more specific mode that targets a particular layer.
The Magic Wand tool's selection modes provide a versatile and powerful way to make selections in Paint Tool Sai. With the ability to adjust sensitivity and target specific layers, users can make precise and controlled selections with ease.
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The Select and Deselect tools work like brushes
Paint Tool SAI has a range of selection tools, including the magic wand tool, the lasso tool, and the rectangle selection tool. The Select and Deselect tools are particularly useful and work like brushes. They are straightforward to use. You simply use the Select tool to brush over the areas you want to be selected, and the Deselect tool to brush over any areas you want to be deselected. You can adjust the size, opacity, and pen pressure of the Select and Deselect tools, and even add texture.
The Select tool can be used in conjunction with the Increment tool to create borders. First, you select the outside of your line art and click Increment a few times. This will make the border bleed slightly into the line art. Then, when you invert the selection, the colour won't bleed through.
The Dilate Selection 1px tool can be used to increase the size of your selection by 1px. The opposite of this tool is the Erode Selection 1px tool, which shrinks the selection by 1px.
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Frequently asked questions
To dilate a selection in Paint Tool SAI, use the "Dilate Selection 1px" function.
The "Dilate Selection 1px" function can be found under the "Selection" menu.
Yes, you can use the Increment tool in conjunction with the Invert tool to increase the size of your selection.
Yes, you can use the "Erode Selection 1px" function to undo the dilation and revert to the original selection.











































