Important LUTCalc Update

Hi All, I've just uploaded a new version of LUTCalc (v1.9RC11). There is one big change under the hood which should barely be apparent to a user, and one of my annoying little (but important) bugs fixed. Links:  LUTCalc main page (with web app version)  LUTCalc For Mac releases page on GitHub  First the good. I have overhauled the maths behind the colourspace (gamut) side of things, to be more robust and flexible. As a consequence, I have simplified the Fluorescent control. Previously, it would include a colour temperature adjustment to compensate for a fluori's temperature, so could be magenta to green or yellow to cyan. I now realise that it is better to keep the colour temperature and the magenta / green adjustment totally separate. For normal use, I would suggest just using the slider in conjuntion with correcting for a fluori's nominal temperature with the colour temperature control. I have left the bulb temperature settings under 'advanced' and added a camera white balance option to better calculate the hue of green or magenta, but the variation now is very subtle, so as I say, the slider alone is the best bet, as with most grading software. The colour stuff is a fairly substantial change; I haven't yet seen any breakages, but they may well be there so please do keep me posted if you find anything behaving strangely. Now the bug. Changing to a non-log output gamma should change the output range to 'legal' for some formats (notably Davinci Resolve). The last version let in a bug which meant that this wasn't being checked for. Sony MLUT (which fixes to legal out for all gammas) and Speedgrade (which wants data in to data out) would be fine, but the result for a Resolve LUT (unless you manually changed output range to legal for non-log gammas) would be noticably higher blacks on the waveform. Personally I have been using it for MLUTs so managed to miss this until now. If anyone has wondered about this, sorry! ** A bit more detail (if you want it! :-) ): On another thread a prominent figure around these parts suggested I was expressing an opinion about log gammas and in particular the maths behind shifting EI exposure (and by extension going between gammas). I do have strong opinions on many things, but the beauty of (pure) maths is that when you stick to just the results of equations you can be pretty confident that something is a fact - provided you don't have a '+' sign in the wrong place! ;-) Still, I went back to check through the workings and I'm as happy now as I was then about the gamma side of things - it's actually pretty straightforward, just hard (for me) to explain. On the colour side however, I decided that it was time to make that more comprehensive. Previously, I have used a colourspace shortcut of manufacturer's published matrices between gamuts, and then calculated the passage to a consistent working colour space. Now, I have written up a system which calculates all these matrices at (as the manufacturer has done) at startup from chromacities and white points. The funny thing is that all going well, the results should be identical to before. The main reasons for doing this have been to tech me more about the mathematics of colour, and to make it easier to add gamuts. I have added DCI-P3 variants and Adobe RGB and Wide Gamut RGB. **

Yet another version, bugfix and potential bug prevention:  LUTCalc web page  LUTCalc For Mac GitHub releases page Very sorry about your problem Lenny; I haven't managed to replicate it, but I have gone through the code working on any potential culprits. I have found one definite bug though, where changing from 'grading LUT' to 'MLUT' wasn't setting the correct clip levels for a Sony camera LUT. The camera should ignore out-of-range values, but to be on the safe side, I would recommend updating and rebuilding any LUTs which are likely to exceed extended range (if you open a cube file in a text editor and see negative values or numbers above about 1.0947, then it's best to rebake it). As a carrot, I have added one tiny extra at the suggestion of Art Adams - at the top of the preview window there is now the option to click between 'legal' (the default) and 'data', which scales the preview values to show the whole of data / extended range. On the subject of Art Adams, I've seen the article - thought the comments seem to have grown since then ;-). Thanks Lenny for the replay and actually I've been in email contact with him (hence the preview suggestion). It's great to hear about people productively playing with my little app! Ben

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