Installation

sudo aptitude install gimp

Common usage

change color image to B&W

• ‘Image/Mode/Grayscale’, or
• ‘Colors/Desaturate’

auto adjust colors

• ‘Colors/Auto [White Balance

  Normalize

  Stretch Contrast

  HSV]’ or

• ‘Colors/Levels’, click ‘Auto’

Why filters are not available

好多图片刚打开时是在’indexed color mode’, 所以很多效果都不支持. 解决办法很简单, click menu ‘Image/Mode’, choose ‘RGB’.

Find Info About Your Image

• “Image/image properties”

blur an image

• make a selection
• /Filters/Blur/Gaussian blur... at 5px as a start

Bump Map

• select the background
• Filters/Map/Bump map
• in “Bump map”, select text layer

using layer mask

1. right click background layer, ‘Add layer mask’, choose white background
2. click text layer, Ctrl-C (Edit/Copy)
3. click background layer, Ctrl-V (Edit/Past)
4. Anchor Layer

给图像加一个soft fade 边框

详解

最省事的一种方法, 用人家定制好的

1. Decor/Fuzzy Border

上述方法产生的是不规则边框, 如果想生成整齐的边框, 则

1. Select/Shrink 10px
2. Select/Feather 10px
3. Select/Invert
4. Edit/Clear ctrl-K

在Gimp 2.4以后有一种更简便的方法

1. Select/Border, choose
2. 根据图片大小选一个边框, 例如80px, 选中”Feather border”
3. Edit/Clear ctrl-K

如果想做更复杂的效果, 可以用”Quick Mask”方法

1. make a rectangular selection around the edge of the image.
2. click “Quick Mask” button on the bottom left corner of the image window
3. right-click the image, select Filters/Distorts/Waves
4. Filters/Blur/Gaussian Blur
5. click “Quick Mask” again to convert mask back to selection
6. Selection/Invert, then Edit/Fill with BG Color

Drawing

make a background

• Filters/Render/Clouds plasma to make a pretty background

Web related

place guidelines

• enable rulers on the top and left,
• click and drag to generate guide lines
• use zoom in/out to adjust details

use Guillotine tool

menu/Image/Transform/Guillotine

save for web plug-in

Filters

How to make an image to sphere/fisheye/circle

我摸索出三种方法, 不过没找到最满意的效果, 先记下来吧.

1. ‘Filters/Map/Map object…’, 在option里选’sphere’.
2. ‘Filters/Distorts/Lens distrotion’, 换换’Main/Edge/Zoom’的数值来制造fisheye 效果.
3. 这个plugin能制作出Amazing circles效果, 不过不是我想要的.
4. GMIC里有fisheye和sphere效果.

Plugins

save the plugin to .gimp-2.x/plug-ins

• G’MIC有很多很漂亮的filter

References

• Official tutorials
• GIMP guru