Help with clip path and tif

[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

[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

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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:

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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

[gent99]

Hello Fred,

I tried

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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...

[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

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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.

[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