Legacy ImageMagick Discussions Archive

Ok, found the reason. The geometry of the original file had an offset:
The solution was to use:
Thanks,
Thomas Mack

I found some images on our website, where the scaled version of a non-transparent image was completely transparent without any other content. Is this a possible bug or did I completely misunderstand something about it?

I placed one such image on http://th-mack.de/download/bugs/im02.tif for testing ...

Great - thank you!

Thomas Mack

Oh yes.
I tested with http://th-mack.de/download/test/in.tif .

Problems on 6.9.0-2 / FreeBSD 10.1 e.g. on -resize x135 and x303 when using convert directly.

When using in PerlMagick, many more:

#!/usr/bin/perl
use Image::Magick;

for(1..400) {
my $image = Image::Magick->new;
$image->Read("in ...

Resizing images sometimes reduces colors to just one color. This depend on the input file and the size reduction.

Running:
for f in $(seq 1 1000); do convert in.tif -verbose -resize x$f out.gif; done
produces output like this:

[...]
in.tif=>out.gif TIFF 7027x5426=>263x203 263x203+0+0 8-bit ...

Hi!

If I use convert input.tif -crop 400x300+301-143 -page 400x300+0+143 output.gif I get the desired result, which is a 400x300 pixel image with the top 143 pixel blank.

When I'm using the perlmagick version of it:

$image->Crop(geometry => "400x300+301-143");
$image->Set(page => "400x300+0+143 ...

So this resolves the problem - thank you very much!

I never found any community or developer resolving bugs or problems so fast and taking care of problems practically immediatelly - very nice.

Thomas (Mack)

Use ftp://th-mack.de with p6791371-bugs as user and bugreports as password.

Just got the idea, ImageMagick might have used existing libraries, as I didn't change LD_LIBRARY_PATH when testing with different ImageMagick versions. So maybe I will test again tomorrow.

So, just did some tests:

- ImageMagick 6.8.0-2 on Windows XP works fine on this image
- Reinstalled 6.7.9-4 from sources on FreeBSD, and it didn't work either
- Installed from same sources and identical configure options on Linux, and it did work correctly
- ImageMagick 6.6.5-8 on Linux didn't have ...

Hello,

I encounter the same problem as in http://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=20287&p=81577&hilit=TIFFWriteDirectoryTagCheckedRational#p81577 with the current ImageMagick version on FreeBSD.

On above bug report it's written, the problem should have been resolved with ...