Jorge Parra wrote: << What I refer to as "target" values are those that come in a table of RGB values along with the Chart. >> Jorge,
A while back I did some calculations comparing the XYZ and RGB values on the Macbeth chart and concluded that they were effectively using sRGB primaries or close. Sadly, I cannot find my notes. One solution to your problem would be to download the Lab version of the chart, correct the patches if they do not quite match the data for your chart, and convert to your preferred working space. You should then have RGB values which match your chart. I do not recall where I found the Lab TIFF image of the ColorChecker, but I can send you one if you need. Alternatively you can easily create your own patches in PS using the Lab data on the ColorChecker. I had a problem recently when I was asked to photograph a painting in the local cathedral, with very mixed and uneven lighting. Like you I wasI using a D60 camera. I used the Macbeth chart to get the white balance, and, together with Color Mechanic (www.colormechanic.com), to improve the colours. Given the extent of problem the results were good. Tim Mimpriss =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
