Undersampling
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Undersampling warnings
In the Huygens Software the sampling you enter to describe your image is compared to the Nyquist Ideal Sampling. If it is large or too large you get orange or red colors in the field entries. This is merely informative, nothing is done to your data: the image will be deconvolved anyway using the actual parameters you entered. But the further you are from the ideal sampling the less deconvolution will improve the image. Therefore, the coloring and the warnings are simply to let you know that your original data won't improve too much, and that you'd better reacquire your images again with a more correct sampling.
You can calculate the ideal sampling for your setup using the Nyquist Calculator.
See also Bleaching Vs Sampling, and the wiki page on Acquisition Pitfalls.