There's actually... six kinds of images here. Complicated much?
Anyhoo, have a program to extract the .btex files: https://dl.dropboxusercontent.com/u/3181...BTexEx.zip
(works for all but one image type, but that image doesn't look interesting anyway for the files given, and I need sleep)
Oh, and for testing image types, I usually just use http://rawpixels.net/ . Simple and gets the job done.
Anyhoo, have a program to extract the .btex files: https://dl.dropboxusercontent.com/u/3181...BTexEx.zip
(works for all but one image type, but that image doesn't look interesting anyway for the files given, and I need sleep)
Oh, and for testing image types, I usually just use http://rawpixels.net/ . Simple and gets the job done.