Testae Posted June 14, 2014 Report Share Posted June 14, 2014 Hello everybody, at the moment I am working on my master's thesis with a RTI-related topic ("Reflectance Transformation Imaging of Transparent Materials") and therefore I of course have to think a lot about the results and information one can obtain with this technique. I came across this earlier but in the last days the following question crossed my mind again and again, especially as the new viewer is able to generate a normal map that can be viewed and examined: So imagine if you have a plain paper with text on it. Pictures are taken with a regular camera and you do your best lighting the whole thing equally or even use some kind of dome. And then you check the normals visualization in the viewer. What you will end up is a display of the paper, its wrinkles (if there are any) and structure (if your camera is good enough). But what you will also see is the text printed onto the paper. But the paint would have sunk into the paper when you printed it. And even if not, it should not build normals in the way they are visualized in the normal map. So this shows that the color sometimes affects the normals in quite anextensive way. Question is: If this is obviously the case, how do I know that an RTI of a painting for example really shows the paint layers and not the differences in color darkness in the normal visualization and the specular enhancement? I discussed the normals-and-color-problem a while ago with George already and then thought that it was due to the fact that I did not use a dome. But now I built a dome and especially contrasts of bright and dark colors still lead to the described issues. So I wonder what to think about this phenomenon? Best, Alex Link to comment Share on other sites More sharing options...
This topic is now archived and is closed to further replies.