Hi,
I want to create a button with rounded corners in Qooxdoo but I'm having some problems. I guess it's a problem with ImageMagick and not my Qooxdoo code, but I'll post it anyway.
So in order to create rounded corners I'm following this guide 
Guide
this is what my image.json contains:
    {
 "jobs" :
 {
  "common" :
  {
   "let" :
   {
    "RESPATH" : "source/resource/custom"
   },
   "cache" :
   {
    "compile" : "../cache"
   }
  },
  "image-clipping" :
  {
     "extend" : ["common"],
     "slice-images" :
     {
     "images" :
     {
     "${RESPATH}/image/source/groupBox.png" :
     {
     "prefix" : "../clipped/groupBox",
     "border-width" : 4
     }
     } 
     }
  },
  "image-combine" :
  {
     "extend" : ["common"],
     "combine-images" :
     {
     "images" :
     {
     "${RESPATH}/image-combined/combined.png":
     {
     "prefix" : [ "${RESPATH}" ],
     "layout" : "vertical",
     "input"  :
     [
      {
         "prefix" : [ "${RESPATH}" ],
         "files" : [ "${RESPATH}/image/clipped/groupBox*.png" ]
      }
     ]
     }
     }
     }
  }
 } 
}
Here's what happens when I run image-clipping and image-combine:
  
    C:\customgenerate.py -c image.json image-clipping
  
INITIALIZING: CUSTOM
  
  Configuration: image.json
  
  Jobs: image-clipping
  
  Resolving config includes...
  
  Resolving jobs...
  
  Incorporating job defaults...
  
  Resolving macros...
  
  Resolving libs/manifests...
EXECUTING: IMAGE-CLIPPING
  
  
    
      
        Initializing cache...
        
        Done
      
    
  
  
  C:\customgenerate.py -c image.json
  image-combine
INITIALIZING: CUSTOM
  
  
    
      
        Configuration: image.json
        
        Jobs: image-combine
        
        Resolving config includes...
        
        Resolving jobs...
        
        Incorporating job defaults...
        
        Resolving macros...
        
        Resolving libs/manifests...
      
    
  
EXECUTING: IMAGE-COMBINE
  
  
    
      
        Initializing cache...
        
        Combining images...
      
    
  
  
  
  Creating image C:\custom\source\resource\custom\image-combined\combined.png
  Magick: no decode delegate for this
  image format
  \docume~1\lomme\lokala~1\ tmpql73hk'
  @ error/constitute.c/ReadImage/532.
  Magick: missing an image filename
  C:\custom\source\resource\custom\image-combined\combined.png' @
  error/montage.c/MontageImageCommand/1707.
  The montage command (montage -geometry
  +0+0 -gravity NorthWest -tile 1x -background None
  @c:\docume~1\lomme\lokala~1\temp\tmpql73hk
  C:\custom\source\resources\custom\image-combined\combined.png)
  failed with the following return code:1
  
The image-clipping works like a charm but I get some kinda error message when I try to run image-combine. When I google the error messages it says ImageMagick is lacking PNG support but I can use other commands like "convert a.jpg b.png" so there must be some kinda png support?
here's what "identify -list format" returns:
PNG* PNG rw-   Portable Network Graphics (libpng 1.2.43)
                      See http://www.libpng.org/ for details 
                      about the PNG format.
  
  PNG24* PNG rw-   opaque 24-bit RGB (zlib 1.2.3)
  
  PNG32* PNG rw-   opaque or transparent 32-bit RGBA
PNG8* PNG rw-   8-bit indexed with optional binary
                      transparency
So why do i get this error message: 
Magick: no decode delegate for this image format
Looks to me like there's png support? I've never used ImageMagick before so I'm completely lost :D
Thanks in advance