Biancoand Posted June 18, 2015 Report Share Posted June 18, 2015 Hello everybody, I was reading Malzbender-Gelb-Wolters 2001 article "polynomial texture maps", and at page 3 I found this phrase: " We prefer this simple but redundat representation over color spaces such as LUV and YCbCr due to the low cost of evalutation although we have implemented the method in these color space as well", this is also confirmed by Malzbender HP Labs Technical Report of 2001 that reports as possible format also PTM_FORMAT_LUM (color space CrYCb). I didn't found the possibility to select this color space in the PTMFitter anyway, and also in the rtiviewer there is no function to load this kind of file. This question arises since the PTM paper describes what they mean by LRGB but not how to compute the values for the R G and B components ( this http://users.csc.calpoly.edu/~zwood/teaching/csc570/final06/jrickwal/ maybe descirbes the problem in a more articulated way ). Could it be possible to calculate a LRGB components using a different colorspace like LUV or YCbCr, extracting the luminance component and use the other two as cromacity? Another point: LRGB is known in astrophotograpy as: http://www.astro-imaging.com/Tutorial/LRGB.html, and is the combination of 4 different photos taken whit different filters. Maybe this could be the source of misinterpretation? Link to comment Share on other sites More sharing options...
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