Legacy ImageMagick Discussions Archive

Thank you very much for both valuable hints.

After having "pkg-config" installed in my $PATH the problem went away. libpng was found and PNG is now a valid delegate! :)

But I also had to set PKG_CONFIG_PATH to /tmp/install/lib/pkgconfig to avoid the use of a local and outdated /opt/X11/lib ...

MacOS X 10.11.2

I cannot build 6.9.2-8 so cannot report "convert -version"

My latest 6.8.9-10 build though gives:
Version: ImageMagick 6.8.9-10 Q16 x86_64 2015-11-11 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2014 ImageMagick Studio LLC
Features: DPC OpenCL
Delegates: jng jpeg lcms ...

I compiled from source using ImageMagick-6.9.2-8.tar.gz and libpng-1.6.19.tar.gz

roughly like this:

mkdir /tmp/install
cd libpng-1.6.19
./configure CFLAGS=-O3 --prefix=/tmp/install --enable-shared --disable-dependency-tracking
make check && make install
cd ../ImageMagick-6.9.2-8
./configure ...

Hi all,

I try to compile 6.9.2-8 but can no longer bind the libpng delegate. "./configure --with-png=yes" ends up with the report
PNG --with-png=yes no
Up to 6.8.9-10 everything works well though. The same compiled libpng is recognized. I tried libpng 1.6.18, 1.6.19 and 1.6.20, just didn't dare ...

Your tiff input 1 does not have either a path or background transparency. So there is no way to remove the alpha channels and get what you want unless there is a path and there is no path.

Correct. We're getting closer to my problem now.

I have a bag full of TIFF files and do not like to check ...

Thanks again for using so much effort on my question.
You got me wrong though.

The second example is fine for me.
It is the first example which bugs me. I want IM to ignore those extra
channels of the TIFF file. They shouldn't be considered for transparency.

If I save both TIFF files as PSD and ...

Thanks for checking this.

input1 has to alpha channels, true. But it could have only one or even more. That is not my concern.

Let me rephrase:
I want to use "-alpha remove" for all TIFF images since this is only way I know to get a good
preview from a TIFF with transparency and clip path. But if ...

Hello all,

can anyone guide me with a TIFF alpha channel/path question.

I need to convert all sorts of TIFFs to a normalized JPEG. Some of those TIFFs
have extra alpha channels (sample "logo-alpha.tif", presumably a left over from
the designer), some have transparent background and a clipping path ...

The source is Photoshop, not PDF.
http://dl.dropbox.com/u/84530/IM/lab250.psd

Hi Anthony,

thanks for taking the time to check my question.

I do not see though how you mean the application of profiles in the IM sense.

If I do convert lab250.tif -profile sRGB.icc lab250-tif.jpg the colors are ok.
If I run convert lab250.psd -profile sRGB.icc lab250-psd.jpg the colors are ...

Thanks a lot henrywho ! Your command line is a helpful workaround.

Do you have another magic spell for converting LAB PSD files?

If I use this input http://dl.dropbox.com/u/84530/IM/lab250.psd and this command line convert lab250.psd -colorspace RGB -distort resize 200x200 -alpha off +repage ...

The colorspace parameter hasn't much influence here. The JPEG automatically gets converted into RGB.

Leave out the -resize option and the result is fine.

Regards, Axel.

Hello all,

I'm converting a LAB TIFF to RGB JPEG. This looks fine without resizing but shows lots of color artifacts when resizing.

Input: http://dl.dropbox.com/u/84530/IM/lab250.tif

convert lab250.tif lab250.jpg gives
http://dl.dropbox.com/u/84530/IM/lab250.jpg

convert lab250.tif -resize ...

I found it

(from config.log)
configure:30677: checking for png.h
configure:30677: result: yes
configure:30700: checking for LIBPNG15 support
configure:30722: gcc -std=gnu99 -std=gnu99 -c -D_THREAD_SAFE -D_THREAD_SAFE -pthread -fopenmp -g -O2 -Wall -D_THREAD_SAFE -pthread -I/opt/local/include -I ...

Hello all,

"make test" stops with this message in "validate-formats-in-memory.log-t"

... (194 passing tests)
test 195: JNG/Undefined/TrueColor/8-bits... pass.
validate: Application built with libpng-1.2.44 but running with 1.5.9 `' @ warning/png.c/MagickPNGWarningHandler/1754.
validate ...