Hi @Thanatomanic ,
many thanks for your time I’ll shot the images as claimed in Rawpedia but one question 
Can you direct or explain me what is raw scaling for (I googled but I didn’t find a clear explanation for men as me 
)?
Cheers
Gabriele
I am not very familiar with the details. The only explanation I know is here: RawTherapee/camconst.json at dev · Beep6581/RawTherapee · GitHub
Somewhere in the paragraph titled ‘How to Measure White Levels’. Hope it helps, and thanks for providing the shots!
Thanks, I didn’t read it (camconst.json) ever…but …
what does it mean if my camera ( Nikon D300) isn’t there??
How RT can decode my raw 
if D300 isn’t there?
Decoding a raw file is a totally different beast. The NEF format for the D300 is well-supported, so RT can decode the image data correctly. However, it needs a little more guidance to display that data properly. That’s where camconst.json comes in.
Thanks… Than We’ll try to give more guidance for D300 decoding… When I have time ( soon) I’ll send the images 
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Hey,
The Nikon D300 is supported for many years. There is no need for changes for this camera.
Find attached a pp3 file with the elements that tackle your problem.
_DSC4330_1.NEF.pp3 (14.1 KB)
Here a screenshot of the result
Hi Reginald,
your PP3 solves magenta but not completely for color propagation… however good for now
Thanks
Hi @Thanatomanic,
I made some photos as here but there is something I do not understand.
When I shoot for LENR=yes I enable the option in the menu but I have no LongExposureNoiseReduction tag in exif… I have only Noise Reduction which is OFF for ever even if I enable and disable the option… However I upload the images to Filebin | ukggmx9z2smbttw7 and I’m here for other informations.
@dafrasaga Thank you for uploading. I don’t know why the LENR didn’t work. I also don’t see any usual differences between the longer exposure shots and the short exposure shots, so I think it is safe to assume that no LENR has been applied.
Some of your lower ISO shots were not fully overexposed. I also see that the G-channels seem to be slightly non-unform, but nothing to worry about. More troubling is that after I enter the white level values obtained from my analysis, I still get a purple look in your original image. I need to look into this a bit further…
It might help if you could redo the shots at lower ISO and use an even brighter scene. In particular I would like shots of ISO 200, 250, 320 and 400. If possible, could you addtionally supply these at intermediate f-values of f/4.0 and f/2.8?
The fact that they are not in the exif should not worry you, as not all cameras write the tag in exif.
But a hint here: when the camera performs LENR, it will take 2 exposures. So if you hear your shutter go on twice that all is fine.
Also, most cameras will do LENR only if your exposure time is bigger than a specific value. So have a look in the manual to check for what values you should set.
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Hi Daniel,
Yes, the exposure time have to be bigger than 8s…
Thanks for the tip 
Hi @dafrasaga the additional shots were helpful, thank you! I have now also seen the ‘aperture scaling’ effect in action for the first time 
I am a little stumped though, because even though I think I did my analysis right, and even with the additional samples, I still cannot get rid of the purple highlight in your original image. Somehow the whitelevels are still off…
But there are still a few tricks we can pull for which I hope you can oblige. Could you also provide the following shots:
- Fully overexposed, f/11, ISO200, no LENR, please three shots like these for averaging (these are basically the conditions in which you shot your original image)
- Fully overexposed, all intermediate f-stops from the lowest you have available up until f/6.3 at ISO200, no LENR (for more information on aperature scaling)
- Same as above, but for ISO2000 (from this ISO onwards the camera scales the raw differently)
- Shot with lens cap on (so completely dark), aperture irrelevant, focus irrelevant, but please two identical shots for all available ISOs.
I know I’m asking a lot, but I kinda like these analyses and it bugs me that the problem isn’t resolved yet 
FWIW, this is my current change for camconst.json if you want to try it out yourself:
{ // Quality B, samples provided by dasafraga (pixls.us), intermediate aperture scaling not available
"make_model": "Nikon D300",
"dcraw_matrix": [ 9000, -1966, -711, -7030, 14976, 2185, -2354, 2959, 7990 ], // DNG_v13 (Neutral v4)
//"dcraw_matrix": [ 9030, -1992, -716, -8465, 16302, 2256, -2689, 3217, 8068 ], // DNG_v13 (Neutral)
"ranges": {
"white": [
{ "iso": [ 200, 250, 320, 400, 500, 640, 800, 1000, 1250, 1600 ], "levels": [ 16383, 15292, 16383, 15317 ] }, // R, G1, B, G2 - R G typically saturate, G1 G2 differ slightly
{ "iso": [ 2000, 2500, 3200 ], "levels": [ 16383, 16323, 16383, 16347 ] }
],
"aperture_scaling": [
{ "aperture": 2.8, "scale_factor": 1.025 },
{ "aperture": 4.0, "scale_factor": 1.011 }
]
}
},
Maybe I am just not understanding something right, so ping @heckflosse or @jdc.
If I look at the overexposed area in the sky in the provided raw image of the boat, and set demosaicing to ‘None’, I readout R = 16383, G1 = 15340 (or slightly different), G2 = 15351 (or slightly different), B = 16383. I now set these levels as white levels in camconst.json. If I then reload the image and set demosaicing to ‘Mono’ I get consistent values of RGB = 1. I interpret this as a confirmation that the white levels are set properly. But when I then switch to any other demosaicing method, the readout shows that the G channel is less than 100%.
I cannot understand why, so I hope someone can enlighten me
Hi @Thanatomanic thanks for your time…actually I Am busy but I will make new shot soon… Many thanks for now
Hi @Thanatomanic,
I made the shots …I used gofile because filebin got network error 
I hope it’s the same…
Ask me whatever you need 
If I’m correct… Do I have to make a camconst.json file where I have options file ??
Would it be as
/home/gabriele/.config/RawTherapee5-dev ??
I don’t know if it’s of value but if I disable Clip out-of-gamut colors and I decrease the Exposure the magenta is more evident
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To update your own camconst.json, just edit the file in the installation folder of RawTherapee. Look for the D500 and just add the D300 entry above it. I am not sure if it would work if you create your own file… Never tried
The updated version of the camconst.json entry looks like this:
{ // Quality B, samples provided by dasafraga (pixls.us)
"make_model": "Nikon D300",
"dcraw_matrix": [ 9000, -1966, -711, -7030, 14976, 2185, -2354, 2959, 7990 ], // DNG_v13 (Neutral v4)
//"dcraw_matrix": [ 9030, -1992, -716, -8465, 16302, 2256, -2689, 3217, 8068 ], // DNG_v13 (Neutral)
"ranges": {
"white": [
{ "iso": [ 200, 250, 320, 400, 500, 640, 800, 1000, 1250, 1600 ], "levels": [ 16383, 15292, 16383, 15317 ] }, // R, G1, B, G2 - R G typically saturate, G1 G2 differ slightly
{ "iso": [ 2000, 2500, 3200 ], "levels": [ 16383, 16323, 16383, 16347 ] }
],
"white_max": 16383,
"aperture_scaling": [ // There seems to be no aperture scaling at ISO2000+, but we cannot deal with that
{ "aperture": 2.8, "scale_factor": 1.0246 },
{ "aperture": 3.2, "scale_factor": 1.0214 },
{ "aperture": 3.5, "scale_factor": 1.0140 },
{ "aperture": 4.0, "scale_factor": 1.0106 },
{ "aperture": 4.5, "scale_factor": 1.0076 },
{ "aperture": 5.0, "scale_factor": 1.0024 }
]
}
},
I’m sorry to say that this does not solve the purple issue, and I am really out of my depth to answer the question “why?”. I expect I am missing some essential information on how these entries actually influence the processing, but currently I have no desire to dive into the code. I hope somebody else can take a look. Maybe it would be good to report this as an issue on the GitHub tracker…
To be continued, I hope.
I wonder why some camconst.json entries have only one white level, while the comment mentions different ones, for example
{ "iso": [ 100, 125, 160, 200, 250, 320, 400, 500 ], "levels": 15520 }, // typical G1,G2 15520-15800 R,B 16383
When I use the lowest WL from your entry for all channels, the purple issue goes away.
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Hi,
I created a camconst.json file next my options file into .config
“camera_constants”: [
{ // Quality B, samples provided by dasafraga (pixls.us)
“make_model”: “Nikon D300”,
“dcraw_matrix”: [ 9000, -1966, -711, -7030, 14976, 2185, -2354, 2959, 7990 ], // DNG_v13 (Neutral v4)
//“dcraw_matrix”: [ 9030, -1992, -716, -8465, 16302, 2256, -2689, 3217, 8068 ], // DNG_v13 (Neutral)
“ranges”: {
“white”: [
{ “iso”: [ 200, 250, 320, 400, 500, 640, 800, 1000, 1250, 1600 ], “levels”: [ 16383, 15292, 16383, 15317 ] }, // R, G1, B, G2 - R G typically saturate, G1 G2 differ slightly
{ “iso”: [ 2000, 2500, 3200 ], “levels”: [ 16383, 16323, 16383, 16347 ] }
],
“white_max”: 16383,
“aperture_scaling”: [ // There seems to be no aperture scaling at ISO2000+, but we cannot deal with that
{ “aperture”: 2.8, “scale_factor”: 1.0246 },
{ “aperture”: 3.2, “scale_factor”: 1.0214 },
{ “aperture”: 3.5, “scale_factor”: 1.0140 },
{ “aperture”: 4.0, “scale_factor”: 1.0106 },
{ “aperture”: 4.5, “scale_factor”: 1.0076 },
{ “aperture”: 5.0, “scale_factor”: 1.0024 }
]
}
}
]}
and it works 