[Digikam-devel] [digikam] [Bug 339801] Thumbnails are not displayed properly on 10-bit/channel monitors

[bogdan at hlevca.com]

https://bugs.kde.org/show_bug.cgi?id=339801

--- Comment #8 from bogdan at hlevca.com ---
X11 and Qt4  (not QT5, yet, will be in QT5.4 when fully released)  handle
10-bit channels. 

Here you can find a thread on the darktable flicker site where I contributed
with information about  how to enable it.  In short you need Linux :-)  a newer
Nvidia card with Display Port and a wide gamut monitor.

https://secure.flickr.com/groups/darktable/discuss/72157644287054058/#comment72157648503252685

Here there is an explanation how to prepare KDE/QT to do it. In short you need
to enable the native rendering mode and not the default raster mode. I tested
with KWin too, you don't need Compiz to make it work. 

http://www.oyranos.org/2014/05/image-editing-with-30-bit-monitors/

You can check you colour depth with this command   $xdpyinfo 

If you have 30 bit colour depth you get something like  depth of root window:  
 30 planes

Below it is a 'small' output of the xdpyinfo tool 

name of display:    :0
version number:    11.0
vendor string:    The X.Org Foundation
vendor release number:    11403901
X.Org version: 1.14.3.901
maximum request size:  16777212 bytes
motion buffer size:  256
bitmap unit, bit order, padding:    32, LSBFirst, 32
image byte order:    LSBFirst
number of supported pixmap formats:    8
supported pixmap formats:
    depth 1, bits_per_pixel 1, scanline_pad 32
    depth 4, bits_per_pixel 8, scanline_pad 32
    depth 8, bits_per_pixel 8, scanline_pad 32
    depth 15, bits_per_pixel 16, scanline_pad 32
    depth 16, bits_per_pixel 16, scanline_pad 32
    depth 24, bits_per_pixel 32, scanline_pad 32
    depth 32, bits_per_pixel 32, scanline_pad 32
    depth 30, bits_per_pixel 32, scanline_pad 32
keycode range:    minimum 8, maximum 255
focus:  window 0x4200bb6, revert to PointerRoot
number of extensions:    29
    BIG-REQUESTS
    Composite
    DAMAGE
    DOUBLE-BUFFER
    DPMS
    DRI2
    GLX
    Generic Event Extension
    MIT-SCREEN-SAVER
    MIT-SHM
    NV-CONTROL
    NV-GLX
    RANDR
    RECORD
    RENDER
    SECURITY
    SHAPE
    SYNC
    X-Resource                                                                  
    XC-MISC                                                                     
    XFIXES                                                                      
    XFree86-DGA                                                                 
    XFree86-VidModeExtension                                                    
    XINERAMA                                                                    
    XINERAMA                                                                    
    XInputExtension                                                             
    XKEYBOARD                                                                   
    XTEST                                                                       
    XVideo                                                                      
default screen number:    0                                                     
number of screens:    1  

screen #0:                                                                      
  dimensions:    2560x1440 pixels (650x366 millimeters)                         
  resolution:    100x100 dots per inch                                          
  depths (8):    30, 1, 4, 8, 15, 16, 24, 32                                    
  root window id:    0x23f                                                      
  depth of root window:    30 planes                         <===   Here i      
  number of colormaps:    minimum 1, maximum 1                                  
  default colormap:    0x20                                                     
  default number of colormap cells:    1024                                     
  preallocated pixels:    black 0, white 1073741823
  options:    backing-store NO, save-unders NO
  largest cursor:    256x256
  current input event mask:    0xfac033
    KeyPressMask             KeyReleaseMask           EnterWindowMask          
    LeaveWindowMask          KeymapStateMask          ExposureMask             
    StructureNotifyMask      SubstructureNotifyMask   SubstructureRedirectMask 
    FocusChangeMask          PropertyChangeMask       ColormapChangeMask       
  number of visuals:    168
  default visual id:  0x21
  visual:
    visual id:    0x21
    class:    TrueColor
    depth:    30 planes
    available colormap entries:    1024 per subfield
    red, green, blue masks:    0x3ff, 0xffc00, 0x3ff00000
    significant bits in color specification:    11 bits
  visual:

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