For a pipeline production of true color images it seems to be more adequate to use the same scaling and cuts in all images, instead of trying to optimize for every particular case. This approach may result in color saturation for very bright sources and/or missing the weakest sources. Also it permits a direct comparison between different images, independently on their effective exposure time.
Currently proposed limits correspond to 2.25 and 675
counts/ks/arcmin
and the scaling is logarithmic. This limits
correspond to 0.01 and 3 counts/ks/pixel (assuming an image scale of 4
arcsec/pixel).
