推荐你使用 onsee 图片转换工具，操作简单，支持"JPEG","JP2","JPC","PNG","BMP","GIF","PCX","PGX","RAS","TGA","TIFF","PPM","PGM","PBM","ICO","CUR","WMF"17种图片格式的互转，安装后只要对要转换的图片点右键，就出现转换格式的菜单，操作流程类似winrar工具。
如果想批量转换，那么只要对图片文件进行多选，然后右键就可以了新浪的下载地址：
http://down.tech.sina.com.cn/content/39737.html
选择“图像”-“模式”-把“16位/通道”改成“8位/通道”就能另存为TGA格式了
PS另存就行啊！
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