A true color image is an image one would see with the naked eye. Any camera you find on the market generally captures true color images. Why is NASA sending up red tinted cameras and no regular cameras?
What you are proposing is ludicrous.
You're creating a false choice. NASA did not choose between 'true color' and 'false color' when designing its camera. This is because digital cameras
do not capture 'true color' images. That is, basically all digital cameras use RGB filters in a manner similar to the pancam on Mars. The photos produced are always and necessarily only an approximation of what we would see with our eyes.
http://electronics.howstuffworks.com/cameras-photography/digital/digital-camera4.htmhttp://en.wikipedia.org/wiki/Digital_camera#Methods_of_image_capturehttp://en.wikipedia.org/wiki/Bayer_filterhttp://pancam.astro.cornell.edu/pancam_instrument/projects_1.htmlThe two Panoramic Cameras (called Pancams) on each of the Mars Exploration Rovers work somewhat like a pair of human eyes. Each camera's light sensitive "cells" are called pixels, and they are part of a light detecting "eye" called a Charge Coupled Device, or CCD. However, unlike the human eye, the Pancams only measure one single wavelength or color at a time. In front of each camera is a filter wheel with eight different filters (seven colors plus one filter for looking at the Sun), each of which allows only certain wavelengths to hit the CCD. The filter wheel in front of the camera in the left Pancam eye of each rover has six filters which span the colors that we can see, from blue to green to red. The other filters can detect colors of light that we cannot see, called "infrared." When we want to take a "true color" picture of Mars, we actually take six pictures of the same exact spot - once with each of the six filters on the Pancam's left eye. Afterwards, we use computer software to combine the separate pictures and to calculate the proportions of primary colors - red, green, and blue - that the rover was seeing. We then combine these three "RGB" images into a single picture which your computer can then display as an estimate of the actual colors that you would see if you were there on Mars. Digital cameras that you can buy in stores work in a similar way, except that the filters are bonded directly onto the CCD, and the RGB images through the different filters are combined automatically for you by the camera's electronics.
...
It's important to point out that this is only an estimate of the true color of each of these scenes from Mars. As mentioned above, everyone perceives color differently, and different computer monitors and printers display color differently. The colors also vary with time of day, and even from day to day because of different amounts of dust and clouds in the Mars atmosphere. And there are also sometimes small calibration problems with the images that can cause errors in the true color calculations.
The pancam is simply a more sophisticated version of a 'regular camera' (whatever that means). But, it wasn't designed to best approximate 'true color' because that's not the most useful thing for that camera to do.
Here are some examples:• Pancam images can be stitched together to build multispectral panoramas of the full scene around the rover, and even full three-dimensional models of the surrounding terrain.
• Panoramic imaging provides information on the morphology of the site, on the lithology, distribution, and shape of nearby rocks, and on local features like fluvial terraces, depositional bars, and dunes that may be present. This information will be relevant to understanding what processes have affected the site, particularly when merged with compositional data.
• Multispectral panoramic imaging will provide information on the mineralogy of materials to supplement and complement data obtained by other instruments.
• Images of the Martian sky, including direct images of the sun, help determine dust and aerosol opacity and composition.
• The generated digital terrain models help guide rover traverse paths.
• Pancam provides information to guide the selection of the most interesting targets to look at with other rover instruments.
And, he also describes the usefulness of false color images
here:
The purpose of these images, unlike the true color images we produce is to enhance subtle differences in color. These differences are sometimes so small that a person looking at them would not be able to see them at all - something you can see by comparing a true color image with its corresponding false color version. Images like these allow scientists to quickly asses even subtle color differences, and to choose the most interesting regions for possible study with the rover arm instruments. Subtle color changes may indicate changes in the materials making up rocks and soils, or how these materials are concentrated or deposited.
And,
here is a much more technical explanation of the scientific objectives of the pancam:
The scientific goals of the Pancam investigation are to assess the high-resolution morphology, topography, and geologic context of each MER landing site, to obtain color images to constrain the mineralogic, photometric, and physical properties of surface materials, and to determine dust and aerosol opacity and physical properties from direct imaging of the Sun and sky. Pancam also provides mission support measurements for the rovers, including Sun-finding for rover navigation, hazard identification and digital terrain modeling to help guide long-term rover traverse decisions, high-resolution imaging to help guide the selection of in situ sampling targets, and acquisition of education and public outreach products. The Pancam optical, mechanical, and electronics design were optimized to achieve these science and mission support goals.
e: Sorry to make this so long, but I noticed something else when looking at this "evidence." All of the examples of changing colors they show in the video and on Ski's website are panoramas. This is relevant for several reasons:
1. Neither Tom, nor the original authors, have made any attempt at all to investigate the optical settings used to take the photo. This make their conclusions specious.
2. It's perfectly reasonable to think that those who made the panorama choose filters that would bring out the most surface detail over displaying 'true color.' This could include preferring infrared light that pierces atmospheric dust more easily than optical light.
3. That's actually exactly what happened.
Here is a panorama that features the pink tab:
http://pancam.astro.cornell.edu/pancam_instrument/independence.htmlThis mosaic is an approximate true color rendering generated using the images acquired through Pancam's 750, 530, and 480 nm filters.
This technical manual shows that those are filters are L2, L5, and L6, respectively.
This image also shows the pink tab:
http://pancam.astro.cornell.edu/pancam_instrument/images/False/Sol001B_P2303_1_False_L256_pos_14.jpgIt comes from
this page of false color pancam images, which shows it was taken with filters L2, L5, and L6.
It's just because the people who made the panorama chose those filters. That's all.
Here is a panorama made using a different set of filters:
http://www.panoramas.dk/mars/mars-dec-2005.html