Image Processing - Other Images
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Other Tricolor Images

Sometimes, you can learn more about an object by looking at different types of images. Other tricolor images can be made using images from other wavelengths of light. Another sky survey called 2MASS (the 2 Micron All Sky Survey) creates tri-color images using three different filters, called the J, H, and K filters, that all lie in the infrared.

Constructing a 2MASS Color Image of NGC5719
(courtesy the Two Micron All Sky Survey*)

The J Filter The H Filter The K Filter A Tri-Color Image


Exercise 4. Create another image of NGC 1087 using SDSS's ultraviolet, green and red images for the blue, green and red filters respectively. Adjust the color balance and max and min brightness to bring out the most detail.

Question 3. How does this image differ from the green, red and infrared image you made in Exercise 2? Which parts of the galaxy stand out more prominently? Which stand out less prominently?

Exercise 5. Repeat Exercise 4 for a different combination of filters that you have not yet attempted.

As you may have learned in the Color project, objects tend to give off more light in certain wavelengths than others. Some objects give off a lot of red light, where others might give off more ultraviolet or infrared. You can see some of the differences in the images you just observed.

*Atlas Image obtained as part of the Two Micron All Sky Survey (2MASS), a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.