There are some infrequent situations that still can lead to problematic results unless the user takes some action. Some modules in Lab color space rely on the fact that the L channels carries all lightness information, with the a and b channels purely representing chroma and hue. Unbounded colors with negative L values are especially problematic to these modules and can lead to black pixel artifacts.
E’ stato riscontrato che sorgenti di luce blu altamente saturate nell’immagine sono giuste candidate per pixel con valori negativi di L. Se sei coinvolto in fotografia da palcoscenico dovresti portare grande attenzione a queste luci nell’immagine.
In order to mitigate this issue the input color profile module has a gamut clipping option. This option is switched off by default but can be activated if artifacts are observed. Depending on the settings, colors will be confined to one of the available RGB gamuts. In effect black pixel artifacts are prevented at the costs of losing some color dynamics.