Technical Notes about these images

version 1.01, 1 February 1996

Disclaimer: The National Aeronautics and Space Administration, the Jet Propulsion Laboratory, and the California Institute of Technology do not endorse or recommend any commercial products mentioned in this document.

Pseudo Natural Color Composite

These images were produced using Thematic Mapper bands 1, 2, 3, and 4. Band 1 was used as blue and band 3 as red. They were contrast enhanced using a gaussian stretch with a 2.5 sigma value. Green was made from a combination of bands 2 and 4. They were added together taking only 15% of band 4 and 85% of band 3. (This process "pumps up" the green in vegetation just a bit to make it look a little more realistic (a very subjective opinion for which I take total responsibility)). The file was then imported into Adobe Photoshop where the saturation of magenta was changed to -50 and a "sharpen more" filter applied. The file was then converted from 24-bit true color to an 8-bit GIF file. This conversion results in very little loss of information when using landsat imagery. (Note: as of this date, only Camarillo and Fillmore have the Photoshop enhancements applied. The other to follow soon, as well as a full res version of the whole Oxnard Plain (1920 lines by 2560 samples).

False Color Infrared Composite

This image was produced using Thematic Mapper bands 3, 4, and 7. Band 4 was used as red, band 3 as green, and band 7 as blue. The image was contrast enhanced using a gaussian stretch with a 2.5 sigma value. The file was then imported into Adobe Photoshop where a sharpen more filter was applied. Then the file was then converted from a 24-bit image to an 8-bit GIF file.

Note: More information to come regarding these images.

This file is http://www-dial.jpl.nasa.gov/~steven/ventura/notes.html
Last updated on 1 February 1996.
Comments to steven@dial.jpl.nasa.gov