I know I can get the direct image URL from Picasa Web Album in a Public Album. And I can also get a lot of image URL in Google Product, such as Google Photos, Blogger, and Play Store. And this URLs all have some parameter to Change the Size of image.For example, I get this two links in Picasahttps://lh3.googleusercontent.com/-1vVMbu8s7d8/VlVQy4J3bDI/AAAAAAAA2vo/Npd_MTH-yLc/s144-Ic42/150724-pluto-hires.jpghttps://lh3.googleusercontent.com/-1vVMbu8s7d8/VlVQy4J3bDI/AAAAAAAA2vo/Npd_MTH-yLc/s800-Ic42/150724-pluto-hires.jpgThe only difference is the size, which is controlled by the s144-Ic42 parameter. And If I manually changed the parameter, the size of image also changed.And I get the direct link of the album cover from Google Play Store.https://lh6.googleusercontent.com/qDjcC6p0mLI4ofiy8omX6Ej8Vq6uIv4iW9k27RoEPzBC8kUshG4c9rpXj7emGiZkFkXzAPuT=w300-rwI found I can change the size through changing the w300-rw to s0 to get a larger one.The question is how can I control the size of photo by changing some parameter? and another question is I can I get the same direct link in Google Photos after Picasa shut down?After a little bit search, I found this site which answered my first question.
How can I change image size using direct image url in Picasa Web Album?
google photos;picasa web albums