Fixed writing number of layers for image with alpha channel. 
Fixed writing number of layers for image with alpha channel. 

Danack/ImageMagick,UniQP/ImageMagick,kwm81/ImageMagick,kwm81/ImageMagick,kwm81/ImageMagick,kwm81/ImageMagick,kwm81/ImageMagick,UniQP/ImageMagick,Danack/ImageMagick,Danack/ImageMagick,UniQP/ImageMagick,UniQP/ImageMagick,UniQP/ImageMagick,UniQP/ImageMagick,Danack/ImageMagick,Danack/ImageMagick,Danack/ImageMagick,kwm81/ImageMagick