Page 1 of 1
Help with clip path and tif
Posted: 2017-06-29T05:47:54-07:00
by gent99
Hi,
i've a problem here with clip path in tif-files. According to this site here.
http://www.imagemagick.org/Usage/masking/#clip-path
this should work to use the clip path for removing the background:
Code: Select all
convert input.tiff -alpha transparent -clip -alpha opaque -strip out.tiff
in my case i'm using this command here to do the same
Code: Select all
convert -colorspace sRGB 3960666_TRIO_H_00.tif -alpha transparent -clip -alpha opaque -strip tmp1.jpg
The source image is a cmyk-tif with a clip path. It's available here for testing:
https://www.dropbox.com/s/5hxxbybyi01ho ... 0.tif?dl=0
The resulting jpg is here:
https://www.dropbox.com/s/xht8u24wj60yyit/tmp1.jpg?dl=0
Unfortunately i'm not able to remove the image's background.
I've tested this with the following versions and os:
7.0.5-5 Q16 x86_64 2017-04-25 on macOS
7.0.5-6 Q16 x86_64 2017-05-14 on RHEL7
6.7.2-7 2015-07-23 on CentOS
Is there an IM evangelist around who could see, what i'm doing wrong? Is it even possible to do what i want?
Kind regards
Re: Help with clip path and tif
Posted: 2017-06-29T09:10:13-07:00
by fmw42
It is a very simple problem. JPEG does not support transparency. Change your output to PNG. Your image also has a CMYK profile, so using profiles to convert to sRGB is better than using -colorspace. Change the path to your profiles as needed
Code: Select all
convert -quiet 3960666_TRIO_H_00.tif -profile /Users/fred/images/profiles/sRGB.icc -alpha transparent -clip -alpha opaque -strip 3960666_TRIO_H_00.png
Or if you want to use JPG, then you must change the transparency to some color, say white:
Code: Select all
convert -quiet 3960666_TRIO_H_00.tif -profile /Users/fred/images/profiles/sRGB.icc -alpha transparent -clip -alpha opaque -alpha opaque -strip PNG:- | convert - -background white -alpha background -alpha off 3960666_TRIO_H_00.jpg
Re: Help with clip path and tif
Posted: 2017-07-11T06:54:12-07:00
by gent99
Hello Fred,
I tried
Code: Select all
convert -quiet 3960666_TRIO_H_00.tif -profile /usr/local/share/colors/icc/AppleRGB.icc -alpha transparent -clip -alpha opaque -strip 3960666_TRIO_H_00.png
unfortunately this does not work so well. My resulting png looks like this:
https://www.dropbox.com/s/75gc422pmc7v2 ... 0.png?dl=0
The jpeg version looks the same...
Re: Help with clip path and tif
Posted: 2017-07-11T09:37:37-07:00
by fmw42
What version of ImageMagick produces your bad result?
You list
7.0.5-5 Q16 x86_64 2017-04-25 on macOS
7.0.5-6 Q16 x86_64 2017-05-14 on RHEL7
6.7.2-7 2015-07-23 on CentOS
Do they all fail or just the 6.7.2.7 which is ancient? Note for IM 7 versions you need to replace "convert" with "magick".
My command works fine for IM 6.9.8.10 Q16 Mac OSX and IM 7.0.6.1 Q16 Mac OSX. It also works for IM 6.7.8.9 Q16 Mac OSX. Sorry I cannot go back as far as 6.7.2.7.
IM6
Code: Select all
convert -quiet 3960666_TRIO_H_00.tif -profile /Users/fred/images/profiles/sRGB.icc -alpha transparent -clip -alpha opaque -strip 3960666_TRIO_H_00.png
IM7
Code: Select all
magick -quiet 3960666_TRIO_H_00.tif -profile /Users/fred/images/profiles/sRGB.icc -alpha transparent -clip -alpha opaque -strip 3960666_TRIO_H_00.png
I would suggest you try upgrading to more current versions of ImageMagick.
Re: Help with clip path and tif
Posted: 2017-07-12T02:03:36-07:00
by gent99
Hi Fred,
thanks again. I tested on 6.7.2-7 2015-07-23 on CentOS just because i have this version on an older VM. I did not actually use this version. I also tested the magick command instead of convert. Unfortunately the result ist still the same on mac with 7.0.5-5 Q16 x86_64. I'll try to get 7.0.6.1 (or perhaps 6.9.8.10 Q16) and will test again.
Kind regards, Holger
