This is a lightweight image viewer with basic image processing.
A thumbnail bar is shown at the bottom of the window with all the images in the folder. The name of the current image and the toolbar are shown at the top of the window. Use the toolbar to access basic commands like: image slideshow, adjust zoom, rotate, delete, crop or resize the image, sort the list or access the program settings. Move the mouse pointer near the left or right side of the window to show the arrows and select the next or previous image. Move the mouse over the buttons to see a short description or over the thumbnails to see more information.
By default, the viewer starts in full screen mode but it can be switched to windowed mode by pressing F11. Also, you can press Enter to hide or show the toolbars, Space to start the slideshow or Escape to exit the program. To use this program as the default viewer for any image file, right click on the file and use the "Open with" option in the context menu.
I had just sign in to recommend Xlideit, a was using picasa photo viewer, just because the photo viewer, but Xlideit now is my main image viewer. Still need some work [configurations, options] but overall ¡excelent!
Great portable viewer! But we want real speed playback for GIF files, and also would not hurt to move the exit button in the corner of the screen for quick access. And do in the future preload previous / next image.