Legacy ImageMagick Discussions Archive

This is the Ghostscript command used by ImageMagick:

"gs" -q -dQUIET -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dMaxBitmap=500000000 -dAlignToPixels=0 -dGridFitTT=2 "-sDEVICE=pngalpha" -dTextAlphaBits=4 -dGraphicsAlphaBits=4 "-r150x150" "-sOutputFile=/tmp/magick-IW9e6gXg-%08d" "-f/tmp/magick-eHVqVwOS ...

Anthony,

Thanks for your reply.
However, to be honest, I have no idea how to do so. Would you be so kind and assist me in this case?

So is this a bug in ImageMagick, since the results using GhostScript directly are correct?

Anthony,

Thanks for your reply.

Obviously, there's no issue when running GhostScript directly.
Here's what I've tried:


gs -dBATCH -dNOPAUSE -sDEVICE=tiff48nc -r300x300 -sOutputFile=gs_file1.tif logo.pdf
gs -dBATCH -dNOPAUSE -sDEVICE=tiff48nc -r300x300 -sOutputFile=gs_file2.tif logo.pdf
compare ...

Problem
When comparing an image with itself the result using the option -metric AE is expected to be 0 . However, the result in case of the file below is (most frequently a value around) 487 .

File
Download file

Commands

convert -density 300 testfile.pdf testfile_1.tif
convert -density ...

Anthony,

Thanks a lot for your explanations.

Unfortunately, it does not seem to be current practice to actually consider the direction of paths when drawing. At least, for Adobe Photoshop it does not seem to matter at all. You can draw a path starting anywhere and tell whether this path is to be ...

First of all, I used the following two versions of ImageMagick to verify the problem described below.

Versions

ImageMagick 6.7.2-6 2011-09-16 Q16
ImageMagick 6.5.4-7 2010-12-13 Q16 OpenMP

Moreover, here are the results of calling convert -list format for each of the two versions ...

Hi magick,

I would like to change the background of an image by applying its clipping path. That is to say that the current image has a white background and a clipping path which describes a part of this image.
The resulting image should be the same image containing the image part with the clipping ...

Hi Anthony,

Thank you very much for your reply!
I will try your solution. However, I wonder whether this is considerably slower than the current solution...

Kind regards,
Sven

Actually it is overlays with red not magenta. As as of some more recent version of IM the overlay tint percentage was change from 90% to 70%. I am not sure when that change however happened as I did not log it at the time (my bad).

Hi Anthony,

would it be possible to keep this value variable ...

Hello anthony,

Thanks for your reply!


Actually it is overlays with red not magenta. As as of some more recent version of IM the overlay tint percentage was change from 90% to 70%. I am not sure when that change however happened as I did not log it at the time (my bad).
Oh, I haven't noticed ...

Hi magick,

I'd like to make a suggestion concerning the compare utility.
Currently, the comparison of two images works as follows:

If all color channels of pixel (x,y) of image A are equal to all color channels of pixel (x,y) of image B, this pixel is overlayed with 90 % white. If only one color ...

Hi magick,

We're using the compare utility intensively and it works flawlessly. If a certain pixel in image A is different from the corresponding pixel in image B, the resulting pixel in image C will be overlayed with 90% magenta.

Now, we're wondering, if it is possible to consider a certain ...

Hi magick,

the documentation says (http://www.imagemagick.org/script/command-line-options.php#metric) that the option -metric AE outputs to STDERR. I wonder, why it does not output to STDOUT. Well, of course it's the error count of the number of different pixels, but it makes it difficult to only ...

Thank you very much for your answer!

Kind regards
Sven