Saturday, April 28, 2007

Release of very large Hubble image

NASA has released a very large image with dimensions 29566 X 14321.
Here is a the link to the page.

It opens quite well in VLIV (prefer the tiff version).

Wednesday, April 4, 2007

Fast image processing

Another side effect of using tiles for very large images is that , as you only load what is visible on the screen, you can apply special effect to a very small subset of the complete image, while maintaining real time.

A simple filter can be inverting the colors of the image, or displaying only the red component of the image.

Some filters that deal with multiple pixels are not easily applicable to single tiles, for example blurring would require data from adjacent tile maybe not in memory.

This filter could be easily implemented in VLIV by small plugins, just like Photoshop plugins.
It may even be possible to use already written plugins as the Photoshop plugin API is widely used and documented.