Legacy ImageMagick Discussions Archive

Trying to install imagemagick and I got an error.

ImageMagick Version: 7.0.6-0.


/usr/bin/ld: /usr/local/lib/libjbig.a(jbig.o): relocation R_X86_64_32S against `.text' can not be used when making a shared object; recompile with -fPIC
/usr/local/lib/libjbig.a: error adding symbols: Bad value ...

You are seeing overhead associated with setting up the OpenMP parallel environment. We can't control that, its part of the libgomp library, not ImageMagick. Or perhaps libgomp has a destructor we can call, but we are not aware of an destructor API call. You can build ImageMagick without OpenMP ...

Oh thanks!

int main(int argc, char const *argv[]) {
MagickWand * wand0;

MagickWandGenesis();

wand0 = NewMagickWand();
MagickReadImage(wand0, "logo:");

MagickTransformImageColorspace(wand0, GRAYColorspace);

MagickShadeImage(wand0, MagickTrue, 125.0, 130.0);


MagickWriteImage(wand0 ...

Thanks @magick,

In my system it shows error, is it because of IM version?
It sows weird error. I couldn't able to understood it. Please look at the below output of valgrind.
==5701== Memcheck, a memory error detector
==5701== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==5701 ...

Version: ImageMagick 7.0.6-0 Q16 x86_64 2017-06-14 http://www.imagemagick.org
Copyright: © 1999-2017 ImageMagick Studio LLC
License: http://www.imagemagick.org/script/license.php
Features: Cipher DPC HDRI OpenMP
Delegates (built-in): bzlib djvu fontconfig freetype gvc jbig jng jpeg lcms lqr lzma ...

@snigbo, you are right. I tested with higher resolution image and IM used 70% to 80% of RAM.

It works fine with smaller images.

@snibgo, could you give a recommendation about hardware?
As I have a similar configuration except RAM. I've only 512 MB RAM. I'm using wand C API.

I have tested just with normal resize operation on image.
And when I perform multiple HTTP request continuously, my CPU usage goes to 100% and if I ...

I have been writing few custom image effects using MagickWand C, and later on use that effects.

Some effects are slow as they contains so many operations. I have written Clone and Destroy wands on many places so I guess it might affect on speed. There is a memory pool but I think it might be very ...

Thank you for consider it.

I checked the output. It gives me the perfect output.
Could you notice, there is a HDRI in features.
So as @snibgo said, I think the HDRI might causes the differences.

And I have installed ImageMagick from source for Linux.

Version: ImageMagick 7.0.5-9 Q16 x86_64 2017-06-01 http://www ...

Is this a bug?
I'm trying to change colour of an image. All colours should be changed except transparent.
Please look at the command.


convert single_color.png -fuzz 20% -fill red +opaque "#00000000" output.png
#or
convert single_color.png -fuzz 20% -fill red +opaque transparent output.png


It ...

Thank you @snibgo, I understood. I was saving image as jpeg using first CLI so it would remove transparency.

convert one.jpg two.jpg -compose over \
-alpha off -compose copy_opacity -composite three.jpg \
+swap +repage -gravity center -compose over -composite output.jpg


I'm trying to convert above CLI into C. But I don't understand the meaning of it. Can anyone please explain about it?
This is what I ...

Thanks a lot @snibgo, it's working

Check below code, you will get the sparse colours from it. This is the first part, double sparse_args hold all sparse colours, now you just need to pass sparse_args to second part. Check my previous post for second part. Let me know if you still not get the expected output.


MagickWand * wand ...