Legacy ImageMagick Discussions Archive

That's right, because I don't want to fill the color (0,0,0,3) using antialias. Afterwards scaling the image it's turned on again to have smooth edges.

This one finally solved all issues (tested with IM 6.9 on Ubuntu 18.04)
convert -quiet -density 1200 -depth 8 -colorspace SRGB +antialias eps:"test02.eps" -colorspace CMYK -transparent 'cmyk(0,0,0,3)' -antialias -resize 1700x1700 -repage 0x0 -density 300 -strip -alpha Extract -negate +write mpr ...

I'm on the right track, but there's still an issue taking the colorspace cmyk into the second conversion.
Running the command without works like a charm.

convert -quiet -density 300 -background None -colorspace sRGB "test02.eps" -alpha Extract +write mpr:MASK +delete -density 300 -colorspace CMYK ...

... what gave me a clue about using a mask (see below). Now the only issue is to get this one running as an one-liner-command as decribed before.
Is it possible to concat those separate commands into one and use some sort of temporary file instead of a physical one (here mask02.png)?

convert -quiet ...

You're right, the only way would be to use the RGB colorspace. The problem is thtat the colours are mixed up converting it back to a CMYK image. Even if I use the right color profiles I'm not able to get the correct color back.

Here's one of my tries having already using density.

convert -quiet -density 1200 -colorspace CMYK -channel RGBA -alpha on +antialias eps:"test01.eps" -background 'cmyk(0,0,0,0)' -fill transparent -opaque 'cmyk(0,0,0,1)' -antialias -resize 1700x1700 -repage 0x0 -density 300 -depth 8 -compress lzw ...

We're using ImageMagick 6.8.9-9 Q16 x86_64 2018-09-28 on a Ubuntu 18.04 LTS.
There can always be only one image submitted to the convert function through the frontend.
Those values are from 0 to 100 with substractive color mixing. Therefore CMYK(0,0,0,1) is near to white and should be transparent as ...

Maybe one more important note.
Our endpoint only only allows us to use "one-liner convert commands". So it might be not possible to reuse images etc.

Should be CMYK

Hi there,

I'm almost finished reading all posts about this issue and I've also tried dozens of tipps to convert my images precisely to a transparent tiff. :?
- transparent #000 > drops the required white areas
- floodfill +0+0 > corrupts the image
- colorspace RGB & and RGBA > distorts the colors ...