GIMP


 
GIMP is a cross-platform image editor available for GNU/Linux, OS X, Windows and more operating systems. It is free software, you can change its source code and distribute your changes.

Whether you are a graphic designer, photographer, illustrator, or scientist, GIMP provides you with sophisticated tools to get your job done. You can further enhance your productivity with GIMP thanks to many customization options and 3rd party plugins.

GIMP (GNU Image Manipulation Program) is a free and open-source raster graphics editor used for image retouching and editing, free-form drawing, converting between different image formats, and more specialized tasks.

GIMP is released under GPLv3+ licenses and is available
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GIMP
GIMP(名稱由GNU Image Manipulation Program(GNU圖像處理程式)的首字母組成)是一個自由及開放源碼的點陣圖圖像編輯器,用於圖像相片潤飾及編輯、自由繪圖、調整大小、裁剪、相片蒙太奇、裝換圖像格式以及其他專業任務。

GIMP始於1995年,使用GPLv3+,可執行於GNU/Linux、MS Windows、Mac OS X等平台,其原生檔案格式的副檔名是.xcf。
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How to Batch Process Files in Gimp
如何在 GIMP, 作 “批量” 處理文件