Possible composite bug [solved]

[Firzen]

Hello,

I need to watermark some grayscale images with composite utility. I am using following command:

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composite -compose atop -gravity SouthEast watermark.png butterfly.jpg output.jpg

Problem is that created output image is brighter and maybe more contrast than original. Images just does not look same. With color (RGB) images is everything ok, only grayscales are the problem. My sample images are here:

watermark.png - https://www.dropbox.com/s/xo5lxzbua6e7t ... k.png?dl=0
butterfly.jpg - https://www.dropbox.com/s/2zj6n5tg7ou6h ... y.jpg?dl=0
output.jpg - https://www.dropbox.com/s/v16im3ld79xcd ... t.jpg?dl=0

Information about my system:

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firzen@phoenix:~$ composite --version
Version: ImageMagick 6.7.7-10 2014-03-08 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2012 ImageMagick Studio LLC
Features: OpenMP    

firzen@phoenix:~$ uname -r
3.16.0-4-686-pae
firzen@phoenix:~$ arch
i686
firzen@phoenix:~$ lsb_release -a | grep Desc
Description:    Debian GNU/Linux 7.7 (wheezy)

Is there something wrong with my command, or this is bug? Thanks in advance.

[snibgo]

ImageMagick 6.7.7-10

That's the problem. I suggest you upgrade to a more recent version.

[Firzen]

Thanks for your answer, but I finally found solution that works even with my version of ImageMagick, which is important for me.

Working command is:

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composite -compose atop -gravity SouthEast -colorspace RGB watermark.png butterfly.jpg output.jpg

It is a bit slower, and so I use it only with grayscale images.