[digiKam-users] Strange Editor Rendering

Tac Tacelosky tacman at gmail.com
Fri Mar 16 18:11:15 GMT 2018

Although I attempted to compile DK, I wasn't successful, so now I'm using
using appImage.  I'll make sure I have the latest version and will report
back if this happens again.



On Thu, Mar 15, 2018 at 7:10 AM, Gilles Caulier <caulier.gilles at gmail.com>

> The Impulse Denoise option give artifacts. The Exposure correction amplify
> this side effect.
> It's certainly a problem in libraw GPL3 extension pack. We do not process
> anything in DK Raw import tool while demosaicing.
> I try to reproduce the dysfunction with the libraw command line tool to
> preform demosaicing (the option are similar than dcraw CLI tool).
> If you have compiled yourself DK, all libraw CLI tools are in
> core/test/rawengine/. dcraw_emu is the tool to reproduce all operations on
> command line :
> [gilles at localhost rawengine]$ ./dcraw_emu
> dcraw_emu: almost complete dcraw emulator
> Usage:  ./dcraw_emu [OPTION]... [FILE]...
> -c float-num       Set adjust maximum threshold (default 0.75)
> -v        Verbose: print progress messages (repeated -v will add
> verbosity)
> -w        Use camera white balance, if possible
> -a        Average the whole image for white balance
> -A <x y w h> Average a grey box for white balance
> -r <r g b g> Set custom white balance
> +M/-M     Use/don't use an embedded color matrix
> -C <r b>  Correct chromatic aberration
> -P <file> Fix the dead pixels listed in this file
> -K <file> Subtract dark frame (16-bit raw PGM)
> -k <num>  Set the darkness level
> -S <num>  Set the saturation level
> -R <num>  Set raw processing options to num
> -n <num>  Set threshold for wavelet denoising
> -H [0-9]  Highlight mode (0=clip, 1=unclip, 2=blend, 3+=rebuild)
> -t [0-7]  Flip image (0=none, 3=180, 5=90CCW, 6=90CW)
> -o [0-6]  Output colorspace (raw,sRGB,Adobe,Wide,ProPhoto,XYZ,ACES)
> -j        Don't stretch or rotate raw pixels
> -W        Don't automatically brighten the image
> -b <num>  Adjust brightness (default = 1.0)
> -q N      Set the interpolation quality:
>          0 - linear, 1 - VNG, 2 - PPG, 3 - AHD, 4 - DCB
> -h        Half-size color image (twice as fast as "-q 0")
> -f        Interpolate RGGB as four colors
> -m <num>  Apply a 3x3 median filter to R-G and B-G
> -s [0..N-1] Select one raw image from input file
> -4        Linear 16-bit, same as "-6 -W -g 1 1
> -6        Write 16-bit linear instead of 8-bit with gamma
> -g pow ts Set gamma curve to gamma pow and toe slope ts (default = 2.222
> 4.5)
> -T        Write TIFF instead of PPM
> -G        Use green_matching() filter
> -B <x y w h> use cropbox
> -F        Use FILE I/O instead of streambuf API
> -timing   Detailed timing report
> -fbdd N   0 - disable FBDD noise reduction (default), 1 - light FBDD, 2 -
> full
> -dcbi N   Number of extra DCD iterations (default - 0)
> -dcbe     DCB color enhance
> -aexpo <e p> exposure correction
> -apentax4shot enables merge of 4-shot pentax files
> -apentax4shotorder 3102 sets pentax 4-shot alignment order
> -dbnd <r g b g> debanding
> -mmap     Use mmap()-ed buffer instead of plain FILE I/O
> -mem       Use memory buffer instead of FILE I/O
> -disars   Do not use RawSpeed library
> -disinterp Do not run interpolation step
> -dsrawrgb1 Disable YCbCr to RGB conversion for sRAW (Cb/Cr interpolation
> enabled)
> -dsrawrgb2 Disable YCbCr to RGB conversion for sRAW (Cb/Cr interpolation
> disabled)
> -disadcf  Do not use dcraw Foveon code even if compiled with
> demosaic-pack-GPL2
> But the impulse denoise option is not here. Only the wavelets denoise
> exists, and this one work fine in DK (as with CLI tool).
> As it said in libraw site, the libraw extra extension pack GPL2 and GPL3
> are deprecated with next libraw 0.19. So i suppose that reporting this
> problem to libraw team will be not supported as well.
> Gilles Caulier
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