Darktable pink issues in Image with Panasonic Lumix G81

[BenBe3D]

Good day,

I have problems with overexposed and underexposed RAW images. For example, the highlights are displayed in pink. Even when I generate an HDR, the highlights are pink. In other programs like Lightroom and Affinity Photo I have no problems. My camera is a Panasonic Lumix DMC G81. In Lighttable, the pictures are still displayed reasonably. If I open the image in Darkroom, the errors occur. If I export the images as EXR, Darktable saves the pink highlights in the image.

It seems to be a problem with the Panasonic camera.
I just tested it with RAW images from my Samsung S9+ phone and everything seems to be OK. I also overexposed there, but there are no pink highlights.

Best regards
Ben

[BenBe3D]

ExifTool Version Number : 12.31
File Name : P1170144.RW2
Directory : K:/OneDrive/Darktable issue
File Size : 18 MiB
File Modification Date/Time : 2021:10:23 13:27:13+02:00
File Access Date/Time : 2021:11:03 14:37:52+01:00
File Creation Date/Time : 2021:10:23 14:31:07+02:00
File Permissions : -rw-rw-rw-
File Type : RW2
File Type Extension : rw2
MIME Type : image/x-panasonic-rw2
Exif Byte Order : Little-endian (Intel, II)
Panasonic Raw Version : 0360
Sensor Width : 4816
Sensor Height : 3464
Sensor Top Border : 8
Sensor Left Border : 8
Sensor Bottom Border : 3456
Sensor Right Border : 4600
Samples Per Pixel : 1
CFA Pattern : [Blue,Green][Green,Red]
Bits Per Sample : 12
Compression : Panasonic RAW 1
Linearity Limit Red : 2111
Linearity Limit Green : 2111
Linearity Limit Blue : 2111
ISO : 100
High ISO Multiplier Red : 1
High ISO Multiplier Green : 1
High ISO Multiplier Blue : 1
Noise Reduction Params : 5 100 4 4 4 200 8 8 8 400 16 16 16 800 32 32 32 1600 64 64 64
Black Level Red : 128
Black Level Green : 128
Black Level Blue : 128
WB Red Level : 620
WB Green Level : 256
WB Blue Level : 399
Num WB Entries : 7
WB Type 1 : Fine Weather
WB RGB Levels 1 : 620 256 399
WB Type 2 : Cloudy
WB RGB Levels 2 : 669 256 368
WB Type 3 : Shade
WB RGB Levels 3 : 718 256 348
WB Type 4 : Tungsten (Incandescent)
WB RGB Levels 4 : 414 256 600
WB Type 5 : Flash
WB RGB Levels 5 : 642 256 392
WB Type 6 : D55
WB RGB Levels 6 : 582 256 400
WB Type 7 : ISO Studio Tungsten
WB RGB Levels 7 : 414 256 600
Raw Format : 4
X Resolution : 180
Y Resolution : 180
Resolution Unit : inches
Software : Ver.1.5
Modify Date : 2021:10:23 13:27:13
Y Cb Cr Positioning : Co-sited
Sensitivity Type : Standard Output Sensitivity
Components Configuration : Y, Cb, Cr, -
Compressed Bits Per Pixel : 2
Light Source : Fine Weather
Image Quality : RAW
Firmware Version : 0.1.5.0
White Balance : Daylight
Focus Mode : Manual
AF Area Mode : 1-area
Image Stabilization : Off
Macro Mode : Off
Shooting Mode : Manual
Audio : No
Data Dump : (Binary data 24584 bytes, use -b option to extract)
Flash Bias : 0
Internal Serial Number : XER1710100083
Panasonic Exif Version : 0412
Color Effect : Off
Time Since Power On : 00:03:17.82
Burst Mode : Auto Exposure Bracketing (AEB)
Sequence Number : 1
Contrast Mode : Unknown (0x13)
Noise Reduction : Standard
Self Timer : Off (0)
Rotation : Horizontal (normal)
AF Assist Lamp : Disabled and Not Required
Optical Zoom Mode : Standard
Conversion Lens : Off
Travel Day : n/a
Battery Level : Medium
World Time Location : Home
Program ISO : 100
Advanced Scene Type : 1
JPEG Quality : n/a (RAW only)
Color Temp Kelvin : 5500
Bracket Settings : 7 Images, Sequence -/0/+
WB Shift AB : 0
WB Shift GM : 0
Flash Curtain : n/a
Long Exposure Noise Reduction : Off
Panasonic Image Width : 4592
Panasonic Image Height : 3448
AF Point Position : none
Num Face Positions : 0
Lens Type : NO-LENS
Lens Serial Number : 0000000
Accessory Type : NO-ACCESSORY
Accessory Serial Number : 0000000
Lens Firmware Version : 0.0.0.0
Faces Recognized : 0
Title :
Baby Name :
Location :
Country :
State :
City :
Landmark :
Intelligent Resolution : Off
HDR Shot : Off
Burst Speed : 0
Intelligent D-Range : Off
Clear Retouch : Off
City 2 :
Photo Style : Standard or Custom
Shading Compensation : Off
WB Shift Intelligent Auto : 0
Accelerometer Z : 256
Accelerometer X : 2
Accelerometer Y : 28
Camera Orientation : Normal
Roll Angle : 0.8
Pitch Angle : -0.6
WB Shift Creative Control : 0
Sweep Panorama Direction : Off
Sweep Panorama Field Of View : 0
Timer Recording : Off
Internal ND Filter : 0
HDR : Off
Shutter Type : Mechanical
Filter Effect : Expressive
Clear Retouch Value : undef
Touch AE : Off
Monochrome Filter Effect : Off
Highlight Shadow : 0 0
Time Stamp : 2021:10:23 12:27:13
Video Burst Resolution : Off or 4K
Multi Exposure : Off
Red Eye Removal : Off
Video Burst Mode : Off
Diffraction Correction : Off
Focus Bracket : 0
Post Focus Merging : Post Focus Auto Merging or None
Time Lapse Shot Number : 0
Maker Note Version : 0152
Scene Mode : Off
Highlight Warning : No
Dark Focus Environment : No
Text Stamp : Off
Baby Age : (not set)
Sub Sec Time : 499
Flashpix Version : 0100
Color Space : sRGB
Exif Image Width : 1920
Exif Image Height : 1440
Interoperability Index : R98 - DCF basic file (sRGB)
Interoperability Version : 0100
Sensing Method : One-chip color area
Scene Type : Directly photographed
Custom Rendered : Normal
Exposure Mode : Manual
Digital Zoom Ratio : 0
Scene Capture Type : Standard
Gain Control : None
Contrast : Normal
Saturation : Normal
Sharpness : Normal
PrintIM Version : 0250
Thumbnail Offset : 34304
Thumbnail Length : 3236
Encoding Process : Baseline DCT, Huffman coding
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:2:2 (2 1)
Jpg From Raw : (Binary data 252041 bytes, use -b option to extract)
Crop Top : 8
Crop Left : 8
Crop Bottom : 3456
Crop Right : 4600
Make : Panasonic
Camera Model Name : DMC-G81
Strip Offsets : 4294967295
Rows Per Strip : 3464
Strip Byte Counts : 0
Raw Data Offset : 256512
Distortion Param 02 : 0
Distortion Param 04 : 0
Distortion Scale : 1
Distortion Correction : Off
Distortion Param 08 : 0
Distortion Param 09 : 0
Distortion Param 11 : 0
Gamma : 2.32421875
Focus Step Near : 0
Focus Step Count : 0
Flash Fired : No
Zoom Position : 0
Lens Attached : No
Lens Type Make : 0
Focal Length In 35mm Format : 0 mm
Aperture Value : 1.0
Shutter Speed Value : 1/20
Sensitivity Value : 0
Faces Detected : No
WB CFA0 Level Daylight : 1603
WB CFA1 Level Daylight : 1024
WB CFA2 Level Daylight : 1024
WB CFA3 Level Daylight : 2329
White Balance Set : Daylight
WB Red Level Auto : 2483
WB Blue Level Auto : 1599
Orientation : Horizontal (normal)
White Balance Detected : Auto
Exposure Time : 1/20
F Number : 0
Exposure Program : Manual
Exif Version : 0230
Date/Time Original : 2021:10:23 13:27:13
Create Date : 2021:10:23 13:27:13
Exposure Compensation : -3
Max Aperture Value : 1.0
Metering Mode : Multi-segment
Flash : Off, Did not fire
Focal Length : 0.0 mm
Sub Sec Time Original : 499
Sub Sec Time Digitized : 499
File Source : Digital Camera
Blue Balance : 1.558594
Red Balance : 2.421875
Shutter Speed : 1/20
Create Date : 2021:10:23 13:27:13.499
Date/Time Original : 2021:10:23 13:27:13.499
Modify Date : 2021:10:23 13:27:13.499
Thumbnail Image : (Binary data 3236 bytes, use -b option to extract)
Advanced Scene Mode : Off
Image Height : 3448
Image Width : 4592
Image Size : 4592x3448
Megapixels : 15.8
Focal Length : 0.0 mm

[MStraeten]

since you didn't tell us the used darktable version - it seems to be the same issue as described in #10288 or #10008

[BenBe3D]

Sorry !

Further information is:

• darktable version : 3.6.0
• OS : Win 10 Build 19042
• Memory : 32GB
• Graphics card : Nvidia GTX 1070 Max Q Design
• Graphics driver : 27.21.14.6259
• OpenCL installed : yes
• OpenCL activated : yes

Files are uploaded: https://onedrive.live.com/?id=B9F42494FF0DCF34%21100031&cid=B9F42494FF0DCF34

[Nilvus]

It's a known issue on all Panasonic Lumix caused by a rawspeed issue. So please, check issue provided by @MStraeten. Just increase by 5 values on all 4 black levels in raw black/white point module. Then create a preset to automatically apply correct values on all new images. I so close this issue as this already known and fixed in actual rawspeed development branch (fix should come in darktable 3.8).

[Nilvus]

Now fixed in darktable master by update of rawspeed submodule. Should be so ok for 3.8.