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Post #277409

Author
Desree
Parent topic
Please help me with histograms.
Link to post in topic
https://originaltrilogy.com/post/id/277409/action/topic#277409
Date created
14-Mar-2007, 6:52 PM
Back once again, and as promised, this time i have scripts. For the moment, no Star Wars, just a focus on Empire since that`s what everyone seems to be working on. First the link:

Scripts

In order to use, extract the folder to your C drive so that it has a root of "C:/Empire/". You now have two choices; either load the DVD files into DGindex and save project into the Empire folder, overwriting the D2V file within, or simply open the "ESBsevideo" script, and replace the filename within to that of an already generated D2V file. You should now be able to just load any of these scripts into VirtualDub, but the comparison script is the one you`ll want to be looking at first. All of these scripts have been level corrected.
Now a couple of notes. When using the 1990 histograms (which i notice today are mislabelled within their directory), if invoking the YV12, you must use a setting of "false,true,true"-affecting the Y,U and V levels respectively-or the Y level will be too high, and you will achieve a bloom affect- the gamma is too high! Also, if using the RGB histograms on their own, DON`T use the matrix command within "ConverttoRGB32()". The default matrix is just right for this conversion, and using "pc.709" throws both the levels and the colours all over the place. The only reason it`s used after the YUV conversions is that this keeps it within the same pallette and gives a better all round colour.
In the Histogram directory`s uploaded yesterday, you`ll notice some labelled SEDVDafter(insert ending here) These were originally intended to ease the transitions from palette to palette, but i originally found that these can have some detrimental effects (blooming, pallette change, oversaturation etc.) and don`t seem to be worth using. These are not used in the comparison script, or indeed any of the scripts, but please feel free to experiment with them, that is, after all, why they`re there.
Oh, and it was mentioned earlier about the washed out look- i do believe that it can be sorted to a degree by changing the gamma levels; either "colorYUV(Gamma_y=0.7)", before using any colourlike filters, or during levels "levels(36,0.7,230,0,255)". 0.7 is only a guess, you will need to play to get it to work correctly. Once again, i hope that these help (in fact, i hope that they work). Any questions, feel free to ask.