11. Use Color Fill for the Undercoat

It's convenient to color each part separately, so that you will be able to easily change selections and use them as clippings later. At that time, it's acceptable to use the Brush tool and the Eraser tool, but if there is an area enclosed by a line then you can fill it in completely with the Bucket tool.

An area like this that is enclosed in solid lines can be filled in using the Bucket tool. Next we'll add a layer for an undercoat.

Open the layer window and tap the ① "+" button to add a new layer for an undercoat. Next, tap the ② Added layer to make it active.

The undercoat layer is beneath the drawing. You may change the order of the layers by dragging the ① Thumbnail image.

Tap the Bucket button on the ① Tool Selection window and select the ② Bucket tool.

Tap the button marked to open the Bucket Settings window.
First, Set ② Bucket Easy Settings to off.
The fill will take the transparency level and color of the starting point and fill in everything within a certain range of the starting point color and transparency at the same transparency level and color. If you would to use the line drawing layer as a boundary, it is a good idea to set ③ Opacity at the boundary of your fill range. If you wish to set the Fill Layer or a part of a photo as a boundary, set Color at the boundary of your fill range. We want to use the drawn lines as a boundary in this case, so please tap ③ Opacity.
The Strength percentage bar sets the level at which the transparency has to differ from the transparency of the fill start point before a boundary is created. For example, if you set the bar to 0%, only parts of the layer with exactly the same transparency will be filled in. If you select 90%, if the transparency of the start point is 100%, parts of the layer up to 10% transparency (almost opaque) will be filled in. If you select 100%, the whole layer will be filled in regardless of transparency at the start point. In this case, we want to set the ④ Strength percentage to 20%.
Next the Reference Layer function. If you select the Current Layer, the Current Layer will be read and filled in.
In the case of selecting the Specific Layer, the Specfic Layer that is selected in ⑥ Layer Row is read, and the Current Layer is filled in. When the Canvas Layer is selected, a picture using all the layers combined is read, and the Current Layer is filled in. In this case we are using the sketch as our reference point and want to fill in the Current Layer. Therefore we want to select ⑤ Specific Layer, tap ⑥ Layer Row, and then select Line Drawing Layer.

Select a color from the Color window. Here we select the ① Hue Thumb and ② Saturation Thumb and drag them to select a skin-tone color.

Now let's fill in the skin color. Tapping inside the line drawing will fill in the entire area. If there are leaks or the entire layer is filled in then press the Undo button (Go back one step).

The figure above shows how the skin and cloth color has been changed with the Bucket tool.

The figure above shows the difference between a strength setting of 0% and 20%. You can see how a stronger setting leads to more area being filled in. If there are gaps between the fill and the lines then increase the strength as much as possible. Also, expansion it can decrease the number of gaps.
I believe it's difficult to grasp the Bucket settings. We often hear people say, "I can't use the Bucket tool because it is buggy. It always fills the entire canvas." but if you don't understand it yet, try setting the Edge to Color 10% and the Reference Layer to Canvas and you should achieve the desired results. Also, the Easy Settings often allow one to use the Bucket tool accurately, so if you don't quite understand the setting yet then turning on "Easy Settings" may help.

After successfully filling in the layer window it will look like this when opened. ① is the line drawing layer, ② is the undercoat fill layers. Once the undercoat is complete you can easily fill in that area with Clipping or select it with the Magic Wand.


  1. Introduction
  2. Start Creating an Artwork
  3. Toolbar and Tool Selection
  4. Do Your Draft Sketch by Hand
  5. About Layers
  6. Let's Trace
  7. Undo and Eraser
  8. Fine Tuning Using the Lasso tool
  9. Check by Reflecting Horizontally
  10. Select Colors in the Color window
  11. Use Color Fill for the Undercoat
  12. Turn Clipping On
  13. Making a Gradation (Shading)
  14. Quick Eyedropper Function
  15. Create Highlights and Shadows
  16. Paste a Texture
  17. Let's Merge Layers
  18. Sign Your Artwork
  19. View Your Artwork
  20. Post Your Artwork
  21. Share Your Artwork
  22. Remove-Ads Add-on
  23. Add Color to the Analog Image using Multiply
  24. Stabilizer
  25. Layer: Clipping is convenient
  26. Layer: Changing the color with Alpha Lock
  27. Layer: Let's try using Screen Tone
  28. Layer: Selection Layer
  29. Layer: Save Layer as Transparent PNG command
  30. Layer: Save Canvas as Transparent PNG command
  31. Layer: Naming your layers to manage them
  32. Layer: Rasterize
  33. Layer: Add Layer from Canvas
  34. Making a Selection with the Magic Wand
  35. Putting texture to the floor with Perspective Form
  36. Skirt with Mesh Form
  37. Entering text with Text tool
  38. Creating manga with Frame Divider tool
  39. Enlarging the canvas with Canvas Size
  40. Cutting off the canvas with Trim
  41. Canvas creation with resolution (dpi) specification
  42. Changing image resolution with Resize
  43. Texture with Material tool
  44. Cut, Copy, Paste
  45. Ruler: Straight Ruler
  46. Ruler: Circular Ruler
  47. Ruler: Elliptical Ruler
  48. Ruler: Radial Ruler
  49. Ruler: Mirror Ruler
  50. Ruler: Kaleidoscope Ruler
  51. Ruler: Array Ruler
  52. Ruler: Array Ruler for Perspective
  53. Ruler: Perspective Array Ruler
  54. Drawing Tool: Straight Line
  55. Drawing Tool: Rectangle
  56. Filter: Brightness & Contrast
  57. Filter: Hue Saturation Lightness
  58. Filter: Color Balance
  59. Filter: Extract Drawing
  60. Filter: Change Drawing Color
  61. Filter: Mono Color
  62. Filter: Gray Scale
  63. Filter: Black & White
  64. Filter: Posterize
  65. Filter: Gaussian Blur
  66. Filter: Zooming Blur
  67. Filter: Moving Blur
  68. Filter: Mosaic
  69. Filter: Stroke (Both)
  70. Filter: Stained Glass
  71. Filter: Wet Edge
  72. Filter: Glow (Inner)
  73. Filter: Stroke (Outer)
  74. Filter: Drop Shadow
  75. Filter: Parallel Gradation
  76. Filter: Concentric Gradation
  77. Filter: Radial Line Gradation
  78. Filter: Auto Paint
  79. Filter: Anime Background
  80. Filter: Manga Background
  81. Filter: Channels Shift
  82. Filter: Expansion
  83. Filter: Sphere Lens
  84. Filter: Table
  85. Filter: Blur Frame
  86. Switching devices / transferring data (with Dropbox)
  87. Switching devices / transferring data (with SD card on Android)
  88. Switching devices / transferring data (with PC on iOS)
  89. Settings window details
  90. Bucket tool details
  91. Blend mode details
  92. How to upload transparent PNG onto Twitter
  93. Notes About Tracing