Thumbnail creation not works

[andchi]

I do not see Thumbnail for the image type ( png ) in the Document Library.

I see properly the Thumbnail of PDF and DOC

Other error when i try to change Alfresco Icon:

Unsupported transformation: transformer.ImageMagick image/png to image/png 

imagemagick version: 7.0.5-2

Configuration in global properties:

### External executable locations ###
ooo.exe=E:/alfresco-community/libreoffice/App/libreoffice/program/soffice.exe
ooo.enabled=true
ooo.port=9100
img.root=E:\\alfresco-community\\imagemagick
img.dyn=${img.root}\\lib
img.coders=${img.root}\\modules\\coders
img.config=${img.root}
img.exe=${img.root}\\convert.exe
alfresco-pdf-renderer.root=E:\\alfresco-community\\alfresco-pdf-renderer
alfresco-pdf-renderer.exe=${alfresco-pdf-renderer.root}\\alfresco-pdf-renderer.exe

Please, help

[andchi]

SOLVED

I think that the Imagemagick inside the Alfresco-community release has a bug.
Imagemagick version: 7.0.5-2
I installed last version with all flags during installation wizard ( NOT for associate files to ImageMagick )
Config in global properties:

img.root=C:\\ImageMagick-7.0.8-Q16-HDRI
img.coders=${img.root}\\modules\\coders
img.config=${img.root}
img.exe=${img.root}\\convert.exe
img.dyn=${img.root}\\lib

http://www.imagemagick.org/script/download.php#windows