DNG files converted from Sigma RAW files with Adobe DNG Converter are rendered with strange colors

[yanjiew1]

Short description

DNG files converted from Sigma RAW files with Adobe DNG Converter are rendered with strange colors. The original raw files are taken from https://raw.pixls.us/. Examples are:

• Sigma - Sigma SD10.X3F
• Sigma - Sigma SD9.X3F

Steps to reproduce

1. Download the file "Sigma - Sigma SD10.X3F" from https://raw.pixls.us/. (keyword to search "Sigma")
2. Convert the downloaded raw file using Adobe DNG Converter
3. Open the converted dng file using RawTherapee. You will see the strange colors.

Expected behavior

The colors in the rendered image are correct.

Additional information

• Version of RawTherapee: 5.8
• Version of your operating system: macOS 12.3.1
• Version of Adobe DNG Converted I used: 14.3

[Thanatomanic]

You don't like the colors? 🤪

But in all honesty, I don't know why the saturation explodes. You can also open the X3F file directly and that seems to work well. I don't think there is much enthusiasm to solve these issues for Foveon based camera's...

[ValZapod]

• Convert the downloaded raw file using Adobe DNG Converter

Why? Also this is a bug in DNG converter. Does Camera RAW reproduces?

[Lawrence37]

The DNG converter seems to be changing the primaries. The color matrix in camconst.json is still applied, resulting in the wrong colors.