by Mike McNamee Published 01/09/2006
Be aware that Lab space is very big and that colours can be out of CMYK gamut and RGB gamut. If you examine the histograms of the a and b channels in Lab mode you will find only a small portion of the -128 to +128 scale is actually in use
This also means that small adjustments can be leveraged to produce quite large visual jumps in your image - so beware.
In the composite of histograms the top left is a full range RGB image (green channel), the top right is that same image converted to CMYK (cyan channel). The two middle histograms are the CMYK converted to Lab. The bottom two histograms are those from the panorama landscape showing a very narrow Lab range of values.
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