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使用 GIMP 抓图与一些小技俩

galeki posted @ 2008年10月03日 04:49 in 桌面应用软件 with tags gimp , 9201 阅读

公示:本文是写给像我这般的 GIMP 菜鸟看的。

我一直都是将 gimp 作为抓图工具来用的,虽然 gimp 较为庞大一些,但这相对于它所提供的功能而言,是完全可以忍受的。如果是单单就抓图而言,无论是抓屏幕,还是抓窗口,还是抓特定的区域,甚至延时抓图,像 gnome-screenshot、ksnapshot、scrot 或者 Imagemagick 提供的 import 等工具都可以很轻松地做到;但是图片往往并不是抓出来就结束了,后续通常还要进行一番处理,因此我们通常到最后还是要请出 gimp。所以我干脆直接使用 gimp 来抓图,并且它还是那么地好用。

1. 抓图快捷键设置

启动 gimp 后,可使用菜单 File -> Acquire -> Screenshot 打开抓图工具,相信大家都是明白人,自会知道这个工具该如何使用。下面只讲述如何设置它的快捷键,因为 gimp 没有为这个工具赋予默认的快捷键。

菜单 File -> Acquire -> Keyboard Shortcuts 可打开 gimp 快捷键总的设置面板,在 Plug-ins 栏目中可以找到 Screenshot 项,根据自己的喜好去设置便可。如果你与我一样,希望使用键盘上的 Print 键调出 Screenshot,并且都是使用 GNOME 桌面,那么要记得取消掉 GNOME 的抓屏快捷键,因为它默认是使用了 Print 键去调用 gnome-screenshot 的。

2. 裁剪所抓取的图片

在已运行 gimp 的状态下,我摁一下 Print 键,打开了抓图工具,选取了屏幕的某个区域进行抓图。在抓图的过程中,可能难以获得准确的图像区域,但是我可以尽量把图像区域抓取得大一些,然后使用 gimp 的裁剪工具进行裁剪。

3. 画一些几何图形

gimp 不是做图工具,而且没有提供专门的几何作图工具。我们抓取的图形,有时希望在上面进行一些图形标注,譬如上图所示的情况。对于这类问题,有一个迂回的办法可以实现,那就是利用 gimp 的框选工具的 stroke 特性来实现,具体如何实现,可参考 gimp 官方网站上的小指南

我们可以将多次框选的区域组合起来,这需要你摁住 Shift 或 Ctrl 键来实现。Shift 键可将框选区域相加,而 Ctrl 则用于框选区域相减。实践一下,便可以体会到它们的用法了。

另外,在使用铅笔或画刷画线的时候,鼠标点出起点后,就摁住 Shift 键,便可以绘制直线了。

4. 背景透明的图片

对于所抓取的图像,如果想将其处理为背景透明 png 或 gif 格式的图片,首先需要为其添加 alpha 通道,菜单 Layers -> Transparency -> Add Alpha Channel 所提供了这一功能,然后可使用下图所示的这些选择工具去除背景颜色即可。

5. 还有……

没事的时候,可以多去 http://www.gimp.org/tutorials/ 看看,希望大家也多分享一下 gimp 使用的一些小经验。

  • 无匹配
shili 说:
2008年10月04日 01:58

透明图片比较实用

carlos 说:
2008年10月24日 04:05

gimp截图,奢侈的用法呀。

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