In addition to what other answers are saying there is also an issue with color calibration. These cameras have been experiencing some very extreme conditions so it would not surprise anyone if there is some slight damage to them in some way. And this can throw off the calibration of them so that they do not capture the images in their right color. This have caused issues before as images from Mars have been published in full color before any exact color calibration step had been conducted. And the colors were very off from what the calibrated image showed the next day. So they want to avoid this as much as possible and does not release any color images from the rover before they have been properly calibrated so they show the true colors of the planet.
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