yotophoto YotoPhoto is an image search engine with a difference. yotophoto是一个图像搜索引擎与别不同的。 It allows you to search for free-to-use stock photographs and images.它可以让您搜索免费向使用存量的照片和图像。 These images are either in the Public Domain or released under generous Creative Commons, GNU FDL or similar licenses.这些图像无论是在公共领域或下释放的慷慨创作共用，在GNU fdl或类似的营业执照。

In short these are images you can use without paying anything.在短期内，这些都是影像，您可以使用无需缴付任何事情。 However an attribution may be required in some cases.不过一归属，可能需要在某些情况下。 They also provide a link to the type of license the image is under for convenience.他们还提供一个连接到的许可证类型的形象，是根据以方便使用。

They index various sources of free imagery on the web including Flickr, Wikipedia, Stock.Xchng, Morguefile, Pixelperfect Digital and OpenPhoto.他们指数各种来源的免费图像在互联网上，包括flickr ，维基百科， stock.xchng ， morguefile ， pixelperfect数字和openphoto 。 Only photographs are indexed at this time.只有照片是索引在这个时候。 Other image types like maps, graphics, illustrations, 3D renderings, charts and the like are not indexed currently.其他图像类型，如地图，图表，插图，三维透视图，图表和类似的是，目前没有编入索引。

You can search by tags, keywords or by color.您可以搜寻标签，关键字或彩色。 You can include stop words and specify image orientation.您可以包括停止词，并指定形象定位。 You can also combine keyword search with color attribute.您也可以结合起来，关键字搜寻与颜色属性。 So if you want to find an exit sign in green you visit:因此，如果您想要找到一个出口指示牌在绿色您访问：
http://yotophoto.com/images/exit/1?color=00ff00

Overall my impression was positive.整体给我的印象是正面的。