Ok, my first feedback on this updated script is:

After trying it on the 97 SE TB version and 2004 SE DVD of ANH, this time it does indeed lock black and white level it seems, but the saturation comes out way too strong at times.

Could it be that the difference in gamma between the two versions is confusing this script? Or is it that the resulting chroma of this script is matched to a luma difference which is now ignored since the black/white levels are locked?

I'm going to try it on some sources that match a bit better in luma.

Interesting You_Too. Can you post examples of the inputs and output when the saturation is too strong?

-G

Here's a good example, though when looking at it like this I think it might've been my mistake after all. I had to re-encode the 04 SE that I got from DJ to mpeg2 and it made it darker for some reason. Maybe that's what makes this harder for the script to match it.

97 SE on top, 04 SE in middle and result on bottom.

Gamma difference isn't the issue, You_Too. The 2004 SE (B reference) frame is massively clipped which is causing problems when redistributing the 97 SE RGB luma.

I've equalised the RGB luma in your A & B reference frames to illustrate the extent of the clipping in the 2004 SE. The only way this script might work with the 2004 SE/Blu-ray is if it's modified to affect hue only.

You_Too, I've modified the Blu-ray to remove most of the clipping from that frame. Would you mind running g-force's script on the following image? Should be a much better result. I've also included an untouched Blu-ray frame (bottom) if you feel like doing a comparison.

edit: added untouched (clipped) Blu-ray frame for comparison.

snicker said:

You_Too, I've modified the Blu-ray to remove most of the clipping from that frame. Would you mind running g-force's script on the following image? Should be a much better result.

Yeah, I know the 04 SE is clipped a lot, and got clipped even more when converted back to mpeg2 it seems. I've had better results with some other experiments but I won't post anything just yet.

Anyway, here's that frame of yours run through the script:

Much better! Though if there was a way to make this script also change hues that would be awesome. In the 97 SE Greedo's face and jacket is incorrectly tinted blue, yet they still appear green/teal here after applying the script.

Thanks for helping out snicker! So, You_Too, you might have better results with the average only (as opposed to the average/min/max) script I posted yesterday, and then doing a MergeLuma so the results don't affect the brightness at all.

I don't think this approach is going to get you a Blue Greedo however, as this is pretty much just a first-order approximation.

I'll wait to hear back on your results from experimenting before updating the script.

-G

Hue maps (top to bottom) - Blu (source), 97 SE (reference), color match result (g-force's script):

Blu-ray matched using 'Match Color' in Photoshop: Photoshop result (top) and hue map (middle), 97 SE hue map (bottom).

You_Too, this seems to be a fairly accurate translation of your reference colours.

snicker said:

You_Too, this seems to be a fairly accurate translation of your reference colours.

I don't know, it looks quite off. The wall light is yellow for example.

Anyway, let's not get stuck in this bad example, using that mpeg2 encode I made just for frame matching. I think g-force's new script can be useful for other things. I'm looking into some possibilities.

You_Too said:

Much better!

Indeed, it now resembles a shot from Star Trek (the original series). Which is, really, closer.

You_Too said:

snicker said:

You_Too, this seems to be a fairly accurate translation of your reference colours.

I don't know, it looks quite off. The wall light is yellow for example.

Reds in both sources have lost subtle highlight detail due to clipping. I've found that once the Blu-ray colour clipping is dealt with, these yellow/orange highlight details show up quite often. They're exaggerated here but not inaccurate.

The hue translation through Photoshop's colour matching is pretty much spot on. If used as a hue adjustment layer for the output from g-force's script (which exhibits less clipping) it should produce quite good results, especially considering the limitations of both sources.

It will be interesting to watch the development of g-force's script. I think we could be on to a winner here.

Hey Moth3r,

I wondered that as well, but I vote that it stays here for the following reasons:

1. It is stemming from a result of SW restoration specific challenges

2. I'm lazy, and don't visit the other thread often

3. We've had less relavent or simular threads here

Ultimately, your call. Of course we could always move it if and when it starts to be used for other purposes.

-G