Hello, I have a issue with images having a green cast. The higher Iso settings 400-3200 have the problem more than 100 - 200. I have tried modifying the Cameras.xml file in the Rawspeed directory with limited success. I am seeing that the values for WB RGGB Black Levels are off for all ISO's getting worse at around + 200 over the correct value for 1600 and 3200. I have not had this problem with Rawtherapee or Lightzone which both use dcraw. I tried converting to DNG to get correct values and manually entering the corrections but this is not practical for the number of images I have. I found a much more comprehensive exif viewer called " ExifTool by Phil Harvey (phil at owl.phy.queensu.ca)" /http://owl.phy.queensu.ca/~phil/exiftool//[1] which I have used to get the correct values Here is a sample comparison from a CRW raw file
ExifTool Version Number : 10.21 File Name : CRW_1750.CRW Directory : . File Size : 8.1 MB File Modification Date/Time : 2010:05:16 13:47:54+01:00 File Access Date/Time : 2016:07:17 15:05:41+01:00 File Inode Change Date/Time : 2012:06:11 13:14:52+01:00 File Permissions : rw-r--r-- File Type : CRW File Type Extension : crw MIME Type : image/x-canon-crw Raw Data : (Binary data 7081606 bytes, use -b option to extract) Jpg From Raw : (Binary data 1413620 bytes, use -b option to extract) File Format : CRW Target Compression Ratio : 10 Image Width : 3072 Image Height : 2048 Pixel Aspect Ratio : 1 Rotation : 0 Component Bit Depth : 8 Color Bit Depth : 24 Color BW : 257 Target Image Type : Real-world Subject Record ID : 0 File Number : 117-1750 Date/Time Original : 2010:05:16 13:47:54 Time Zone Code : 0 Time Zone Info : 0 Original File Name : CRW_1750.CRW Thumbnail File Name : CRW_1750.THM User Comment : Canon File Description : EOS 300D DIGITAL CMOS RAW Canon Image Type : CRW:EOS 300D DIGITAL CMOS RAW Owner Name : Tim Rolph Make : Canon Camera Model Name : Canon EOS 300D DIGITAL Serial Number : 0670235886 Base ISO : 100 ROM Operation Mode : USA Canon Firmware Version : Firmware Version 1.1.1 Focal Length : 18 mm Focal Plane X Size : 23.22 mm Focal Plane Y Size : 15.49 mm Auto ISO : 100 Measured EV : 8.12 Target Aperture : 4.5 Target Exposure Time : 1/50 Exposure Compensation : 0 White Balance : Auto Slow Shutter : None Shot Number In Continuous Burst : 0 Optical Zoom Code : n/a Flash Guide Number : 0 Flash Exposure Compensation : 0 Auto Exposure Bracketing : Off AEB Bracket Value : 0 Control Mode : Camera Local Control Focus Distance Upper : 3.14 m Focus Distance Lower : 2.22 m F Number : 4.5 Exposure Time : 1/54 Measured EV 2 : 8.125 Bulb Duration : 0 Camera Type : EOS Mid-range Auto Rotate : None ND Filter : n/a Self Timer 2 : 0 Bracket Mode : Off Bracket Value : 0 Bracket Shot Number : 0 Macro Mode : Unknown (0) Self Timer : Off Quality : RAW Canon Flash Mode : Off Continuous Drive : Single Focus Mode : AI Focus AF Record Mode : CRW+THM Canon Image Size : Large Easy Mode : Manual Digital Zoom : Unknown (-1) Contrast : Normal Saturation : Normal Sharpness : 0 Camera ISO : n/a Metering Mode : Evaluative Focus Range : Not Known AF Point : Manual AF point selection Canon Exposure Mode : Program AE Lens Type : n/a Max Focal Length : 55 mm Min Focal Length : 18 mm Focal Units : 1/mm Max Aperture : 3.6 Min Aperture : 22 Flash Activity : 0 Flash Bits : (none) Zoom Source Width : 3072 Zoom Target Width : 3072 Manual Flash Output : n/a Color Tone : Normal Canon Model ID : EOS Digital Rebel / 300D / Kiss Digital ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to [email protected]
