[solved] Re: How to get rid of a biased colour profile?
Ralf Mardorf
silver.bullet at zoho.com
Mon May 27 15:11:02 BST 2019
On Mon, 2019-05-27 at 15:32 +0200, Boudewijn Rempt wrote:
> If you use that profile, you're using something really weird, because
> that's a very special profile meant for use with HDR images. In your
> earlier mail, you omitted to tell us which color model/channel
> depth/profile you were using for the image, and what the color
> management settings in Krita's settings dialog were.
>
> If your image is 8 bit / rgba / sRGB with srgbtrc and your display
> profile is srgb as well, and you save as srgb png, and your monitor is
> set to sRGB then the image on the wallpaper and in Krita must look the
> same.
Let's keep it short, I already wasted to much time with this issue, to
get a broken artwork. The artwork is broken on it's own, no export
needed, since Krita's default view profile was broken and I wasn't aware
of it.
If I display a picture with Krita, then by default I expect that it
looks the same as when viewed with any other app, such as a simple
viewer such as feh or mirage, a web browser such as Firefox or Chrome,
as well as with other pixel manipulating software, such as Gimp. Krita
didn't, by using the defaults. I mentioned the used default somewhere by
the provided links.
My EIZO monitor does run with user defined settings, not with EIZO's
sRGB profile, but without taking a look to the details, if I switch
between my user profile and the EIZO default sRGB mode, it makes no
visible difference.
Krita's default was sRGB-elle-V2-srgbtrc.icc.
What ever is chosen by the
color general tab doesn't make a difference.
Not my artwork, but as a reference I loaded a photo done with an iPad
with several apps:
$ exiftool /home/rocketmouse/Pictures/cornflower_wall_plain-2019-may/IMG_2788.JPG
ExifTool Version Number : 11.30
File Name : IMG_2788.JPG
Directory : /home/rocketmouse/Pictures/cornflower_wall_plain-2019-may
File Size : 3.9 MB
File Modification Date/Time : 2019:05:25 08:58:44+02:00
File Access Date/Time : 2019:05:27 15:54:10+02:00
File Inode Change Date/Time : 2019:05:26 15:40:22+02:00
File Permissions : rw-r--r--
File Type : JPEG
File Type Extension : jpg
MIME Type : image/jpeg
Exif Byte Order : Big-endian (Motorola, MM)
Make : Apple
Camera Model Name : iPad Pro (12.9-inch) (3rd generation)
Orientation : Horizontal (normal)
X Resolution : 72
Y Resolution : 72
Resolution Unit : inches
Software : 12.3
Modify Date : 2019:05:24 12:46:45
Y Cb Cr Positioning : Centered
Exposure Time : 1/168
F Number : 1.8
Exposure Program : Program AE
ISO : 16
Exif Version : 0221
Date/Time Original : 2019:05:24 12:46:45
Create Date : 2019:05:24 12:46:45
Components Configuration : Y, Cb, Cr, -
Shutter Speed Value : 1/168
Aperture Value : 1.8
Brightness Value : 6.60319106
Exposure Compensation : 0
Metering Mode : Spot
Flash : Auto, Did not fire
Focal Length : 3.0 mm
Subject Area : 3649 2641 751 753
Run Time Flags : Valid
Run Time Value : 770375864504541
Run Time Scale : 1000000000
Run Time Epoch : 0
Acceleration Vector : -0.9236037728 -0.02263331227 -0.3712795378
Sub Sec Time Original : 650
Sub Sec Time Digitized : 650
Flashpix Version : 0100
Color Space : Uncalibrated
Exif Image Width : 4032
Exif Image Height : 3024
Sensing Method : One-chip color area
Scene Type : Directly photographed
Exposure Mode : Auto
White Balance : Auto
Focal Length In 35mm Format : 29 mm
Scene Capture Type : Standard
Lens Info : 3mm f/1.8
Lens Make : Apple
Lens Model : iPad Pro (12.9-inch) (3rd generation) back camera 3mm f/1.8
Compression : JPEG (old-style)
Thumbnail Offset : 1916
Thumbnail Length : 11610
Profile CMM Type : Apple Computer Inc.
Profile Version : 4.0.0
Profile Class : Display Device Profile
Color Space Data : RGB
Profile Connection Space : XYZ
Profile Date Time : 2017:07:07 13:22:32
Profile File Signature : acsp
Primary Platform : Apple Computer Inc.
CMM Flags : Not Embedded, Independent
Device Manufacturer : Apple Computer Inc.
Device Model :
Device Attributes : Reflective, Glossy, Positive, Color
Rendering Intent : Perceptual
Connection Space Illuminant : 0.9642 1 0.82491
Profile Creator : Apple Computer Inc.
Profile ID : ca1a9582257f104d389913d5d1ea1582
Profile Description : Display P3
Profile Copyright : Copyright Apple Inc., 2017
Media White Point : 0.95045 1 1.08905
Red Matrix Column : 0.51512 0.2412 -0.00105
Green Matrix Column : 0.29198 0.69225 0.04189
Blue Matrix Column : 0.1571 0.06657 0.78407
Red Tone Reproduction Curve : (Binary data 32 bytes, use -b option to extract)
Chromatic Adaptation : 1.04788 0.02292 -0.0502 0.02959 0.99048 -0.01706 -0.00923 0.01508 0.75168
Blue Tone Reproduction Curve : (Binary data 32 bytes, use -b option to extract)
Green Tone Reproduction Curve : (Binary data 32 bytes, use -b option to extract)
Image Width : 4032
Image Height : 3024
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:2:0 (2 2)
Aperture : 1.8
Image Size : 4032x3024
Megapixels : 12.2
Run Time Since Power Up : 8 days 21:59:36
Scale Factor To 35 mm Equivalent: 9.7
Shutter Speed : 1/168
Create Date : 2019:05:24 12:46:45.650
Date/Time Original : 2019:05:24 12:46:45.650
Thumbnail Image : (Binary data 11610 bytes, use -b option to extract)
Circle Of Confusion : 0.003 mm
Field Of View : 63.7 deg
Focal Length : 3.0 mm (35 mm equivalent: 29.0 mm)
Hyperfocal Distance : 1.61 m
Light Value : 11.7
Regards,
Ralf
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