Mastering the fill tool: ① Basics




Compatible with Clip Studio Paint Ver. 1.9.14


The [Fill tool] is a tool to fill in a specified area.

If the clicked area is [White], it will fill in all the white area as its range.


[1] Follow adjacent pixel

[Follow adjacent pixel] is a valid option when there is a different color around the area to fill.

*In the default settings, this option is displayed only in the [Tool Option] palette of the sub tool “Refer only to editing layer" or “Refer other layers”, and the setting is enabled.




■(1) When [Follow adjacent pixels] is enabled.


When [Follow adjacent pixel] is enabled, the selected area is colored in as the range until it becomes adjacent to areas with a different color.

For example, in the illustration below, a line drawing is drawn in black on a white background.

In this case, if [Follow adjacent pixel] is enabled, the color of the line is different from the clicked background color, and therefore, areas within the line drawing would be colored in.

If you wish to fill in only the area surrounded by a line or another color, be sure to enable [Trace adjacent pixels].




■(2) When [Follow adjacent pixels] is disabled.


If [Follow adjacent pixel] is disabled, colors of the selected position would be regarded as the range, so the entire white area would be filled in.

Conversely, even if the selected area is surrounded by lines and other colors, if [Trace adjacent pixels] is disabled, you can fill in every area with the same color that you have selected.


[POINT Utilize [Follow adjacent pixel] to maximize efficiency. ] 

  • When you wish to color in one area enable → [Follow adjacent pixel]
  • If you wish to color in areas with the same color disable → [Follow adjacent pixel]

Although [Follow adjacent pixel] is usually enabled, learn to make use of it when disabled to increase the efficiency.


[2] Multiple References to Layers

“Refer only to editing layer” as the default setting, will fill in the color by referring to the image in the selected layer.


By enabling [Multiple referring], you are able to make use of images drawn on other layers.

Within “Refer other layers”, this option is enabled in the initial settings.


You can also set which layer to refer to.


[POINT Displayed layers will be the only ones to be referred to ]

Hidden layers will not be referred to with any settings.




■(1) In case [Multiple referring] is disabled


Since the red and blue lines on another layer will not referenced, the inside of the red frame and the blue frame will also be painted in.




■(2) [Multiple referring] is enabled and [All layers] is selected


All visible images (line drawings) will be referred to and filled it.




■(3) [Multiple referring] is enabled and [Selected Layer] is selected


Only the layers (with black and blue line drawings) in the selected status in the layer palette would be referred to and filled in.


[POINT] Please note the way how layers are selected

When selecting multiple layers with the [Layer] palette and filling in, you must have the “pen mark” displayed on the layer to be filled in.

Select the layer to be filled in first (in this case the “black” layer) and then select the layer (in this case the “blue” layer) to use for reference.




■(4)[Multiple referring] is enabled and [Layer in folder] is selected.


Refer and fill only the layers in the folder. The layer to be filled and the layer to be referenced must be in the same folder.




■(5) [Multiple referring] is enabled and [Reference layer] is selected


This setting allows the layer to be used as the filling range set as the “reference layer” beforehand and used as a reference for filling.


[3] Configure a non-reference layer

While selecting reference layers, you can set layers to not be excluded.

Clicking the “+” next to the [Multiple referring] opens the menu for this.

If the draft layer, the line drawing layer and the fill layer are separate layers, setting [Multiple referring] to [All layers] will also reference the draft layer and the fill is not executed accurately.

You can hide the draft layer, but sometimes you might want to display it as a reference.

In this case, set the draft layer to [Set as Draft Layer] in advance.

Then fill by setting [Drawing Layer] to [Unreferenced Layer] from the [Multiple referring] in the [Fill] tool.

Non-reference layers can be selected as required from ① [Draft layer], ② [text Layer], ③ [Current Layer], ④ [Paper layer] and ⑤ [Locked Layer]

Especially [Drawing Layers] and [Paper Layers] are not referred to usually for filling, so they are not specified in the initial setting.


[4] Area scaling

The [Fill] tool can be expanded or shrunk with regards to the range of filling and reference.

With this option you can even fill anti-aliased lines nicely.

Anti-aliasing is a method to make the image slightly blurred so that it looks smoother at the actual size.

If you fill in lines with anti-aliasing, it may seem like it’s leaving out some portions, but this occurs because semi-transparent areas cannot be filled.

In such case, separating the layer and the line drawing to fill in colors, and placing the layer to fill below the line drawing layer is recommended. (Because the area to fill is expands inward of the line drawing, if the layer of the line drawing is underneath, or if the filling is done directly on the layer of the line drawing, the line becomes thinner.)

Turn on [Area scaling] for the [Fill] tool and specify the extended range with numerical values (①).

Set [How to zoom] to [to the darkest pixel] (②).(For [Scaling method], click the "+" left to the [Area scaling] as to open the menu.)

The [To darkest pixel] option determines to fill up until the area reaches the darkest area of the line drawing.

In case expanding the area exceeds the line with the specified value, the [to darkest pixel] of the line option stops it from extending further.


You can see this well by placing the fill layer above the line drawing.

If an option other than [to darkest pixel] is selected, it may overflow.

Particularly, if the line has strong and weak features, expanding with only a specified value may result in overflowing at thin areas.


[POINT: Make good use of area scaling]

Although “Area scaling” is useful when filling in along outlines, it may also be used when you want to intentionally have colors overflow the lines or to leave unfilled areas inside the line. Make good use of it according to the taste of the lines.


[5] Color margin

[Color margin] is used when filling and to specify the area to be filled by specifying “the color of the filling portion and how close the color has to be as to be regarded as the same color”.

When filling with anti-aliased lines or lines with shading, you can adjust the [Color margin] and paint cleanly.


[6] Close gap

■(1) Close gap


When filling inward of a line drawing, if the line is interrupted even by a little, the color will overflow.

If [Close gap] from the [Fill] tool is enabled, areas within the line can be filled in even if there are small gaps between the lines.

The numerical value represents the size of the gap, and gaps smaller than that will be considered to be closed.




■(2) Soak into narrow area


If you use the [Close gap] option, in addition to line breaks, places where lines are adjacent to each other can also be recognized as “gaps”, leaving behind some unfilled areas.

In such a case you can make use of the [Soak into narrow area] function.

Since this option is not displayed in the [Tool Property] palette by default, it can be switched ON/OFF from the [Sub Tool Detail] palette.

From the [Window] menu → [Show sub tool detail palette] → [Sub Tool Detail] palette, and turn on [Fill] → [Soak into narrow area].

  • In order to show [Soak into narrow area] in the [Tool Property] palette, change the “eye” button on the left side to show.


If [Soak into narrow area] is enabled, narrow areas where lines are adjacent to each other and have been considered “gaps” according to that [Close gap] settings, will the be filled in as well.


[7] Stop filling at the center of a vector layer path.

Since filling can not be done on the “Vector” layer, drawing the line art on the vector layer and filling it on a raster layer is a good option.

[Stop filling at center line of vector] is a useful tool when trying to reference something that is drawn on the vector layer for filling.

The center lines (called a path) of a line drawing only exist on a vector layer.

Filling these with the [Stop filling at center line of vector] function enabled, will result in filling areas up to the center of the vector line (path).

This function can be used not only for filling anti-aliased line drawings but also for filling the space between open brush tip images such as those from the [Decoration] brushes.


A line with spacing as shown in the image below may have breaks from gaps and therefore may not be filled accurately.

Even in cases where the gap between the brush tip image is enough to be covered by the [Close Gap] function, it cannot be painted accurately due to its complex shape.

Even if the space between the brush tip images is wider, you can easily fill up to the center of the drawn lines by enabling the [Stop filling at center line of vector].

  • Even if the interval of the brush tip image is open, if the start point and the end point of the line itself are not connected, the line will still be considered incomplete, and leaks occur.

When conducting this procedure, please close the lines firmly.


[8] Anti-aliasing

[Anti-aliasing] is an option to apply anti-aliasing to the tip of the fill

When [Area Scaling] is enabled, you are able to apply anti-aliasing onto the side of expanded fill area



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