This image was 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 with Adobe Photoshop using the adjust,levels command. The green band 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). The green band was then contrast enhanced as above. The resulting triplet has the Photoshop sharpen filter applied and 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.
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 as above. The triplet was then converted from a 24-bit image to an 8-bit GIF file.
These images were produced from the first four principle components applied to the seven visible, near-infrared and thermal infrared bands of this image. The first PC color composite uses PC1 as red, PC2 as green, and PC3 as blue. The image was then contrast enhanced as above and converted to an 8-bit GIF. The second PC color composite uses PC2 as red, PC3 as green, and PC4 as blue. This image was also enhanced as above.
This file was produced from a 16-bit 3-Arc Second Digital Elevation Model. The image was first converted to 8-bit data by setting the minimum elevation value of the data set to zero and the maximum to 255. The image was then contrast enhanced as described above. Since the data is b&w, it was converted to GIF and has no loss of information (other than the 16-bit to 8-bit conversion).