Legacy ImageMagick Discussions Archive

Got it: I need to exclude *both* the `date` and `time` chunks: $convert in.pdf -define png:exclude-chunk=time,date out1.png $ #No more date/time info in the PNG metadata: $exiftool -G -e -n out1.png | grep -i date [File] File Modification Date/Time : 2018:09:28 20:34:12+02:00 [File] File Access Date ...

Sorry @snibgo, I missed your answer: By default, PNG outputs contain date metadata. To exclude it, use "-define png:exclude-chunk=date". Thank you! That still requires a second pass with ExitTool since the "Modify Date" metadata remains present in the output: $ convert in.pdf -define png:exclude ...

I found a workaround: # Metadata name seems to be case-sensitive! convert in.pdf -set datecreate "" -set "Modify Date" "" -set "datemodify" "" out1.png exiftool -G -e -n out1.png [ExifTool] ExifTool Version Number : 10.40 [...] [PNG] Pixel Units : 0 [PNG] Datecreate : [PNG] Datemodify : [PNG] Modify ...

Ok, with further investigations it appears the embedded metadata are different (creation time) : diff <(hexdump -C out0.png) <(hexdump -C out1.png) 10,11c10,11 < 00000090 3e 00 00 00 07 74 49 4d 45 07 e2 09 1c 13 29 27 |>....tIME.....)'| < 000000a0 7f ab ad d6 00 00 00 0a 49 44 41 54 08 d7 63 60 ...

I noticed if I convert the same PDF to several PNG, the PNG files are different according to the `diff` tool. Steps to reproduce: convert xc:red in.pdf convert in.pdf out0.png convert in.pdf out1.png diff out?.png -->Binary files out0.png and out1.png differ In my use case, this is an issue since ...

Thank you for the reply @magick.

I regularly read the "Usage" pages since many years--and never realized they were maintained by only one person outside of the main project!

I will directly contact Anthony by mail since I spot another broken link.
-Sylvain

Thank you @snibgo!

I found a solution using FX escape sequences and `-layers merge` : convert 'bkgnd.png' \ 'legal.png' \ 'c2a827c66a5b37625c95626f8b84d07b-parts1.png' \ -set page '+%[fx:-w/2]+%[fx:-h/2]' \ '-layers merge' \ '+repage' \ 'c2a827c66a5b37625c95626f8b84d07b.png' Let me know if there are other solutions ...

the correct link should be:

https://www.imagemagick.org/Usage/basics/#page

(basics with an `s`)

I post in this section, but I'm not sure this is the right place for documentation issues. Anyway: On https://www.imagemagick.org/Usage/compose/#geometry: Layer Canvas/Page Offsets The composition of Layered Images use a very different philosophy. All the images (as many as you like) are treated ...

Hi everyone, I have N layers I would like to flatten in only one image. The layers are of various size and I would like them to be all centered in the final image. And I wasn't able to to find a solution to do that using the `-layers flatten` operator. convert 'bkgnd.png' \ 'legal.png ...

Thnaks for the idea @snibgo:

Or create another installation of IM, with its own policy.xml.

I will do that. Or maybe run the current install in a chrooted environment.

policy.xml sets limits that can't be relaxed.

I was afraid of that.

Does that mean if I need more resources to handle an exceptional use case, I must relax the policy for the whole system first?

Hi everyone, Is there a way to disable the "memory" policy for a specific instance of `convert` without affecting other applications using ImageMagick? More specifically, I have a large amount of PNG image to convert to an animated gif. This is a one-shot operation--and the workstation has more than ...

Thank you a lot for all your comments and remarks Alan.

With your help, I managed to export my images as CMYK while minimizing color differences with the original RGB design.
Now this is in the hands of the printing shop. This will be the final test--result is a week or so!