Digital Light & Color

Version: 8-May-2018

I created a jpg within PWP7 and PWP8
700x700 Pixel, color r=102, g=204, b=102
sRGB-Profil and working space

PWP8-file PWP7-file PWP8- Color management settings Problems:
- If I open the PWP8-generated file in PWP7, PWP7 doesn't see the profile
- If I open the PWP8-generated file in Qimage, Qimage doesn't see the profile
- If I open the PWP8-generated file in Gimp 2.10, Gimp 2.10 doesn't see the profile

- If I open the PWP7-generated file in PWP8, PWP8 doesn't see the profile
- If I open the PWP7-generated file in Qimage, Qimage sees the profile
- If I open the PWP7-generated file in Gimp 2.10, Gimp 2.10 sees the profile

Exiftool shows the profile in both files. But there are differences, I cannot interprete

JFIF Version : 1.00 <---> JFIF Version : 1.01
Exif Byte Order : Little-endian (Intel, II) <---> Exif Byte Order : Big-endian (Motorola, MM)

---- output from exiftool for PWP7-file ---------
======== G:/Bearbeitung/2018/PWP8/PWP8-WIC/PWP_7_RGB_102_204_102_sRGB.jpg
ExifTool Version Number : 10.78
File Name : PWP_7_RGB_102_204_102_sRGB.jpg
Directory : G:/Bearbeitung/2018/PWP8/PWP8-WIC
File Size : 17 kB
File Modification Date/Time : 2018:05:09 10:58:29+02:00
File Access Date/Time : 2018:05:09 10:58:29+02:00
File Creation Date/Time : 2018:05:09 10:58:29+02:00
File Permissions : rw-rw-rw-
File Type : JPEG
File Type Extension : jpg
MIME Type : image/jpeg
JFIF Version : 1.00
Resolution Unit : inches
X Resolution : 100
Y Resolution : 100
Exif Byte Order : Little-endian (Intel, II)
Software : Picture Window Pro 64 v7.0.20
Profile CMM Type : Linotronic
Profile Version : 2.1.0
Profile Class : Display Device Profile
Color Space Data : RGB
Profile Connection Space : XYZ
Profile Date Time : 1998:02:09 06:49:00
Profile File Signature : acsp
Primary Platform : Microsoft Corporation
CMM Flags : Not Embedded, Independent
Device Manufacturer : Hewlett-Packard
Device Model : sRGB
Device Attributes : Reflective, Glossy, Positive, Color
Rendering Intent : Perceptual
Connection Space Illuminant : 0.9642 1 0.82491
Profile Creator : Hewlett-Packard
Profile ID : 0
Profile Copyright : Copyright (c) 1998 Hewlett-Packard Company
Profile Description : sRGB IEC61966-2.1
Media White Point : 0.95045 1 1.08905
Media Black Point : 0 0 0
Red Matrix Column : 0.43607 0.22249 0.01392
Green Matrix Column : 0.38515 0.71687 0.09708
Blue Matrix Column : 0.14307 0.06061 0.7141
Device Mfg Desc : IEC http://www.iec.ch
Device Model Desc : IEC 61966-2.1 Default RGB colour space - sRGB
Viewing Cond Desc : Reference Viewing Condition in IEC61966-2.1
Viewing Cond Illuminant : 19.6445 20.3718 16.8089
Viewing Cond Surround : 3.92889 4.07439 3.36179
Viewing Cond Illuminant Type : D50
Luminance : 76.03647 80 87.12462
Measurement Observer : CIE 1931
Measurement Backing : 0 0 0
Measurement Geometry : Unknown
Measurement Flare : 0.999%
Measurement Illuminant : D65
Technology : Cathode Ray Tube Display
Red Tone Reproduction Curve : (Binary data 2060 bytes, use -b option to extract)
Green Tone Reproduction Curve : (Binary data 2060 bytes, use -b option to extract)
Blue Tone Reproduction Curve : (Binary data 2060 bytes, use -b option to extract)
Image Width : 700
Image Height : 700
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:4:4 (1 1)
Image Size : 700x700
Megapixels : 0.490
-----------------------------------------------

------ Output from Exittool for PWP8-file --------
======== G:/Bearbeitung/2018/PWP8/PWP8-WIC/PWP_8_RGB_102_204_102_sRGB.jpg
ExifTool Version Number : 10.78
File Name : PWP_8_RGB_102_204_102_sRGB.jpg
Directory : G:/Bearbeitung/2018/PWP8/PWP8-WIC
File Size : 17 kB
File Modification Date/Time : 2018:05:09 11:01:49+02:00
File Access Date/Time : 2018:05:09 11:01:49+02:00
File Creation Date/Time : 2018:05:09 11:01:39+02:00
File Permissions : rw-rw-rw-
File Type : JPEG
File Type Extension : jpg
MIME Type : image/jpeg
JFIF Version : 1.01
Resolution Unit : inches
X Resolution : 0
Y Resolution : 0
Exif Byte Order : Big-endian (Motorola, MM)
Profile CMM Type : Linotronic
Profile Version : 2.1.0
Profile Class : Display Device Profile
Color Space Data : RGB
Profile Connection Space : XYZ
Profile Date Time : 1998:02:09 06:49:00
Profile File Signature : acsp
Primary Platform : Microsoft Corporation
CMM Flags : Not Embedded, Independent
Device Manufacturer : Hewlett-Packard
Device Model : sRGB
Device Attributes : Reflective, Glossy, Positive, Color
Rendering Intent : Perceptual
Connection Space Illuminant : 0.9642 1 0.82491
Profile Creator : Hewlett-Packard
Profile ID : 0
Profile Copyright : Copyright (c) 1998 Hewlett-Packard Company
Profile Description : sRGB IEC61966-2.1
Media White Point : 0.95045 1 1.08905
Media Black Point : 0 0 0
Red Matrix Column : 0.43607 0.22249 0.01392
Green Matrix Column : 0.38515 0.71687 0.09708
Blue Matrix Column : 0.14307 0.06061 0.7141
Device Mfg Desc : IEC http://www.iec.ch
Device Model Desc : IEC 61966-2.1 Default RGB colour space - sRGB
Viewing Cond Desc : Reference Viewing Condition in IEC61966-2.1
Viewing Cond Illuminant : 19.6445 20.3718 16.8089
Viewing Cond Surround : 3.92889 4.07439 3.36179
Viewing Cond Illuminant Type : D50
Luminance : 76.03647 80 87.12462
Measurement Observer : CIE 1931
Measurement Backing : 0 0 0
Measurement Geometry : Unknown
Measurement Flare : 0.999%
Measurement Illuminant : D65
Technology : Cathode Ray Tube Display
Red Tone Reproduction Curve : (Binary data 2060 bytes, use -b option to extract)
Green Tone Reproduction Curve : (Binary data 2060 bytes, use -b option to extract)
Blue Tone Reproduction Curve : (Binary data 2060 bytes, use -b option to extract)
Image Width : 700
Image Height : 700
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:4:4 (1 1)
Image Size : 700x700
Megapixels : 0.490
2 image files read

While profiles are saved as a normal tag in TIFF files, profiles in JPEGs have their own special area in which they are saved, separate from all the other tags. I had forgotten this and WIC apparently has no support for writing this special tag, but I had also forgotten that I had solved this problem many years ago by writing code to insert a profile in the file after writing it, so I should be able to resurrect this old solution and get JPEG profiles working again.