笔尖

自动笔刷

The generic circle or square. These brush tips are generated by Krita through certain parameters.

蒙版类型

我们可以在笔刷的轮廓上应用三种蒙版，圆形和方形笔尖均适用：

默认

This is the ultimate generic type. The Fade parameter produces the below results. Of the three auto brushes, this is the fastest.

柔化

这种蒙版的淡化由一条响应曲线进行控制。

高斯

这种蒙版使用高斯算法来确定淡化效果，它的速度最慢。

可用选项

直径

此项参数控制笔刷的像素大小。

宽高比

此项参数控制笔刷的外形如何被拉长。

淡化

此项参数控制笔刷轮廓的淡化方式。要锁定水平和垂直淡化比例，可点击滑动条右边的“锁链”图标。淡化参数在不同的蒙版下面的效果不同，如果淡化的效果与预期不符，可以检查一下是不是选错了一种蒙版。

With fade locked.

With fade separately horizontal and vertical.

角度

此项参数控制笔刷的朝向角度。

尖峰数

此项参数控制笔尖轮廓的尖峰数量。它的效果与宽高比参数有关，宽高比越低，形状会越接近星形，尖刺感也会越明显。

密度

此项参数控制笔刷填充其轮廓的多少，可以理解为刷毛的密度，调低后会使笔迹带有噪点。下图是密度分别为 0%、50%、100% 时的效果。

随机度

此项参数控制密度的随机程度。下图是随机度分别为 0%、50%、100% 时的效果。

间距

此项参数控制笔尖在画布上留下笔迹的间距。下图是间距分别为 0、1、5 时的效果。

自动 (间距)

勾选此项后笔刷间距将会使用一种不同的算法 (二次方)，可以对间距进行更细致的控制。右下图是自动模式下间距分别为 0、1、5 时的效果。

抗锯齿

勾选此项将启用笔刷轮廓的抗锯齿平滑功能。下图的两个笔刷都是默认笔刷在淡化被设为 0 时的效果，左边是没有启用抗锯齿时的效果，右边时启用了抗锯齿时的效果。此功能对于勾线笔刷非常有用，它跟自动间距配合使用时效果最好。

精度

此参数控制笔画轮廓的精确程度。精度越低，处理速度越快，但笔画轮廓的一致性就越差。勾线笔刷最好总是把精度设为 5，而大面积铺色的笔刷对精度的要求较低，把精度设为 1 可以提高笔刷处理速度。

自动 (精度)

This allows you to set the precision linked to the size. The first value is the brush size at which precision is at last 5, and the second is the size-difference at which the precision will decrease.

以“笔刷全精度大小”为 10，“精度递减区间”为 4 的笔刷为例：

• 笔刷大小为 10 则精度为 5

• 笔刷大小为 14 则精度为 4

• 笔刷大小为 18 则精度为 3

• 笔刷大小为 22 则精度为 2

• 笔刷大小为 26以上则精度为 1

预制形状笔尖

使用一个预先制作好的图案作为笔尖。 GIMP 和 Photoshop 也使用此类笔尖， Krita 与它们的笔刷文件兼容性如下：

abr

Gimp autobrush tip definitions.

*.gbr

Gimp single bitmap brush tip. Can be black and white or colored.

*.gih

Gimp Image Hose brush tip: contains a series of brush tips that are painted randomly or in order after each other. Can be black and white or colored. Krita does not yet support all the parameters yet.

abr

Photoshop 笔刷集合文件。我们支持这种笔刷文件的大部分基本特性，但尚未支持一些相对高级的特性。

注意：Photoshop ABR 笔刷的支持是通过逆向工程实现的，因为 Adobe 并未公开这种文件的格式规范。我们强烈建议所有 Krita 使用 GBR 和 GIH 格式分享笔尖。如果笔刷比较复杂，可把笔刷预设作为 Krita 资源包导出分享。

笔尖的预制形状选项页面列出了全部可用的预制笔尖，另外还有 4 个选项可以影响笔刷的位图笔尖的初始效果：

缩放

Scales the brush tip. 1.0 is the native size of the brush tip. This can be fairly large! When painting with variable size (for instance governed by pressure), this is the base for the calculations.

旋转

Initial rotation of the brush tip.

间距

Distance between the brush tip impressions.

Brush Mode

Different modes shown with different brush tips.

Alpha Mask

For colored brushes, don’t paint the actual colors, but make a grayscale brush tip that will be colored by your selected foreground/background color. Lighter areas will be interpreted as more transparent.

Color Image

Use the brush tip image exactly as it is. Especially useful for image stamps.

Lightness Map

4.3 新版功能: Combines the features of Alpha Mask and Image Stamp modes. Transparency is preserved as it is in Image Stamp mode, but colors or gray tones in the brush are replaced by the foreground color. The Lightness values of the brush tip image (if thinking in HSL mode) are preserved, so dark parts of the image are dark, and bright parts are bright. This allows image stamps where you can choose the color, but preserve highlights and shadows, and can even create an effect of thick paint in a brush stroke by simulating the highlights and shadows caused by the texture of the paint and brush stroke (sometimes called an “impasto” effect).

There are three sliders here, to control the exact feel of the current brush tip in Lightness or Gradient mode:

• Neutral point

  This is the lightness level that will be the same as your current foreground color. Higher values than this will be lighter versions of the current foreground color, and lower, darker versions of the current color.

  Brightness

  Makes the tip as a whole brighter or darker.

  Contrast

  Increase the contrast between dark and light areas in the tip.

Gradient Map

4.4 新版功能: Use the lightness values of the brush tip image as a map to a gradient. Black maps to the left side of the gradient, and white to the right side of the gradient. The gradient used is the currently selected gradient in the main window, so you can change the gradient quickly and easily while painting. This mode allows image stamps with multiple colors that can be changed (great for flowers or other colorful vegetation), and can allow paint brushes that have multiple colors. Image adjustment sliders for Lightness Map mode can be used for this mode too. A tutorial for this mode is here: Gradient Map Brush Tips .