Hi to Everyone,
I am a newbee in digital image processing, as I discovered Darktable
only a few days ago. I own a Canon EOS 600D which I bought last
december ; before that I had an old Canon Powershot G2, which RAW images
I treated with 'dcraw'.
To get the best of the CR2 raw images that I get from my EOS 600 D, I
soon realized that I needed an icc profile. I therefore attempted to
create one, following Pascal Debruijn method.
I then shot a newly bought 'CMP Digital Target 4' according to said
method, using the integrated flash set to 'manual -- ΒΌ power', 100 ISO -
1/100s, auto WB, f22 downto 1.8 in small steps, and imported the CR2s
into Darktable 1.1.3 in my 64-bit Ubuntu 13.04 system, the parameters
being set in accordance to Pascal's online document. I picked an image
which brightest white spot was as close as possible to the requirements
(L 88) and, by increasing the exposure by +0.37, I brought it to L 96.6,
which is within the gap 245 to 250 in rgb level as prescribed by CMP.
Then the image was exported to a 16-bit tiff file, which I attempted to
process through Argyll software, expecting to get what was needed to
obtain an icc profile.
But the Argyll processing failed !
True enough, in the command line, I issued a statement calling for
'CMP_Digital_Target-3.cht', while the target I shot was a Digital Target
4. But the '/usr/share/color/argyll/ref' directory that I have, does not
have any file mentioning 'Digital Target 4'. However, the Argyll
software that I just installed is that which is available through the
Ubuntu 13.04 repository... Maybe I should build a newer one from a
tarball, or just add another file to the version I get... In any case,
you can see what I got below :
# scanin -v -p -a -dipn img_0001.tiff
/usr/share/color/argyll/ref/CMP_Digital_Target-3.cht CMP_DT3.txt
TIFFReadDirectory: Warning, Unknown field with tag 18246 (0x4746)
encountered.
TIFFReadDirectory: Warning, Unknown field with tag 18249 (0x4749)
encountered.
(as far as these two warnings are concerned, I get them in many other
instances ; I think that there is a bug somewhere in the exif data
concerning the flash). Let us then see what comes next :
Input file 'img_0001.tiff': w=3436, h=2384, d = 3, bpp = 16
Data input file 'CMP_DT3.txt'
Data output file 'img_0001.ti3'
Chart reference file '/usr/share/color/argyll/ref/CMP_Digital_Target-3.cht'
Creating diagnostic tiff file 'diag.tif'
About to allocate scanrd_ object
Verbosity = 2, flags = 0x22a01
About to read input tiff file and discover groups
adivval = 1.000000
About to calculate edge lines
1791 useful edges out of 5025
About to calculate perspective correction
Perspective correction factors = 0.000000 -0.000001 1718.000000 1192.000000
About to calculate rotation
Mean angle = 0.175781
Standard deviation = 3.452119
Robust mean angle = 0.392236 from 1654 lines
About to calculate feature information
About to read reference feature information
Read of chart reference file succeeded
About to match features
Checking xx
Checking yy
Checking xy
Checking yx
Checking xix
Checking yiy
Checking xiy
Checking yix
Axis matches for each possible orientation:
0: xx = 0.719426, yy = 0.687260, xx.sc = 0.959616, yy.sc = 0.959552
90: xiy = 0.367483, yx = 0.664653, xiy.sc = 1.916317, yx.sc = 0.960715
180: xix = 0.719426, yiy = 0.687631, xix.sc = 0.959616, yiy.sc = 0.959503
270: xy = 0.367483, yix = 0.664315, xy.sc = 1.916317, yix.sc = 0.960888
r0 = 0.994871, r90 = 0.380752, r180 = 0.995077, r270 = 0.380673
There are 1 candidate rotations:
cc = 0.994871, irot = 0.392236, xoff = 48.161067, yoff = 29.737301,
xscale = 1.042084, yscale = 1.042153
About to compute final match transform
Improve match
About to setup value scanrdg boxes
About to read raster values
About to write diag file
scanin: Error - CGATS file 'CMP_DT3.txt' read error : Unable to open
file 'CMP_DT3.txt' for reading
In the end, I have a diag.tiff file, but I am unable to get any
information from it : it won't open using either Darktable, ufraw or the
GIMP. As for the above mentioned 'img_0001.ti3', it is nowhere to be found.
Thanks in advance for your help
Bernard
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