Hi, I ask again in the hope that someone has a better understanding of the file formats used in Argyll... > Well this is a way to try now. I do not have a description file of the > chart I use (Macbeth Colorchecker, not the one included) and tried to > write the two files (.cht and .txt for the actual values). I did not > get what to write in the XLIST / YLIST definitions. I just do not > understand the documentation of the cht-format here. The reference > edges - is it the borders between the color patches? The chart has > 6x4 patches, so should I write the centerline of the 5 vertical and > 3 horizontal edges here? If someone can give me hint I would really like to try if using such a basic scanner-based profile would help. But I am stuck in creating that file right now. TIA&CU, Lars.