Clip path problem when saving TIFF as a transparent PNG

[cva]

Hi,

I've searched the forums for a solution but cannot find one, so sorry if I am repeating a question. I would really appreciate your help to fix my problem.

ImageMagick version: ImageMagick 6.8.9-0 Q16 x64 2014-04-06
Sample file: http://www.conceiva.com/_tmp/watch.tif

I want to create a transparent PNG from the above TIFF file. In Photoshop, I can see there are clip paths and I can use the first clip path to remove the background and then save as a PNG. This works great in Photoshop.
In ImageMagick, I am trying to do the same via the ImageMagick command line. I've tries all sorts of command lines such as:

Code: Select all

convert.exe watch.tif -clip -alpha transparent +clip -channel A -negate im.png

The problem I am always seeing is the clip path is not quite right. Below are the results from Photoshop and ImageMagick (please ignore color differences; that's a separate issue that I can handle):
Photoshop output: http://www.conceiva.com/_tmp/ps.png
ImageMagick output: http://www.conceiva.com/_tmp/im.png

You can see that on the top left near the "ADJUST" text, the edge is indented in the ImageMagick PNG but not the Photoshop PNG. Also on the bottom right under the "SEARCH" text, the edge is cut off.

I have 1000s of these images that all seem to have the same clip path problem and that I need to convert into PNG. What am I doing wrong? Is there a solution?

Many thanks in advance!

Best regards,

Paul.

[fmw42]

This seems to work better than using -clip for me. Extract the clip path as an svg file and put it into the alpha channel. I am not sure why using -clip is giving a bad outline. It may be a bug. I am using IM 6.8.9.1 Q16 Mac OSX with RSVG. The following is unix syntax. Using profiles gets better color in the PNG rather than -colorspace. PNG does not support CMYK, which is the colorspace of your tiff file.

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identify -format '%[8BIM:1999,2998:#1]' watch.tif > clip.svg

convert watch.tif -alpha off \
-profile /Users/fred/images/Profiles/USWebCoatedSWOP.icc \
-profile /Users/fred/images/Profiles/sRGB.icc \
clip.svg -compose copy_opacity -composite watch.png

for windows, replace the ending \ with ^

[cva]

Many thanks for the quick reply.

Just tried it on my Windows 7 computer. I am getting this error:

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convert.exe: no decode delegate for this image format `clip.svg' @ error/svg.c/ReadSVGImage/2955.

I assume that means I don't have RSVG delegate support.

"convert -list format" outputs the following:

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      SVG  rw+   Scalable Vector Graphics (RSVG 2.40.1)
     SVGZ  rw+   Compressed Scalable Vector Graphics (RSVG 2.40.1)

"convert - list configure" outputs the following:

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DELEGATES      bzlib freetype jpeg jp2 lcms png tiff x11 xml wmf zlib

I have simply installed ImageMagick from http://www.imagemagick.org/script/binar ... hp#windows. I have not installed anything else. Do I have to install other components?

Best regards,

Paul.

[fmw42]

I do not know much about Windows. Did this line work?

Code: Select all

identify -format '%[8BIM:1999,2998:#1]' watch.tif > clip.svg

This will be a simple text file that you should be able to open in any text editor.

If it did not get created or does not look correct, then just run

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identify -format '%[8BIM:1999,2998:#1]' watch.tif

The svg text will go to the terminal (CMD window) and you can copy and paste it into a text file with .svg for the suffix.

If it did get created and the other command failed, then post your command line here and I will look to see if it is correct.

The fact that convert -list format shows SVG as rw+ with RSVG should indicate that you have RSVG installed and IM can find it. I have heard from others that some delegates do not show in the list from convert -list configure in Windows. So that may not be a bad indicator.

My RSVG is 2.40.2, so not much newer than yours. So I would expect that is OK.

Do you have installed the profiles that I used? You have to use your own path to them, not mine.

Check your delegates.xml file and see what command is being used for svg. Mine shows

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  <delegate decode="svg" command=""rsvg-convert" -o "%o" "%i""/>
  <delegate decode="svg:decode" stealth="True" command=""inkscape" "%s" --export-png="%s" --export-dpi="%s" --export-background="%s" --export-background-opacity="%s" > "%s" 2>&1"/>

[cva]

Just uninstalled ImageMagick and re-downloaded and installed the latest Windows ImageMagick binary to make sure I did not have install problems. Unfortunately, the problem still occurs.

Command line I am using is basically what you have suggested (except I just stripped off color profiles for simplicity)

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identify.exe -format '%[8BIM:1999,2998:#1]' watch.tif > clip.svg

- works fine. no errors. clip.svg text file created (~15KB).

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convert.exe watch.tif -alpha off  clip.svg -compose copy_opacity -composite watch.png

- error message produced:

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convert.exe: no decode delegate for this image format `clip.svg' @ error/svg.c/ReadSVGImage/2955.

Any ideas?

[fmw42]

That command works fine for me, except the colors are off because you did not use profiles.

Not sure why you are getting that message. Did you check your delegates.xml file for the lines with SVG? See my last comments in the previous message.

Post the text in the clip.svg file here inside "code" using the Code button above. Perhaps it is not getting created correctly.

[cva]

Thanks - that was a good hint.

My delegate.xml had:

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  <delegate decode="svg" command=""rsvg-convert" -o "%o" "%i""/>
  <!-- Remove the extra space in - -export in the line below when you want to use inkscape -->
  <!--<delegate decode="svg:decode" stealth="True" command=""inkscape" "%s" - -export-png="%s" - -export-dpi="%s" - -export-background="%s" - -export-background-opacity="%s" > "%s" 2>&1"/>-->

So, I uncommented the inkscape decode line and removed spaces in - -export:

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  <delegate decode="svg" command=""rsvg-convert" -o "%o" "%i""/>
  <!-- Remove the extra space in - -export in the line below when you want to use inkscape -->
  <delegate decode="svg:decode" stealth="True" command=""inkscape" "%s" --export-png="%s" --export-dpi="%s" --export-background="%s" --export-background-opacity="%s" > "%s" 2>&1"/>

Next, I downloaded and installed inkscape. Added it to the PATH system variable. Now, no error message now when processing the convert command line , but after 15 secs of processing the convert command line, ImageMagick crashes .

I'll double-check my installs & PATH to make sure they are OK.

[cva]

clip.svg:

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'<?xml version="1.0" encoding="iso-8859-1"?>
<svg width="1654" height="2205">
<g>
<path style="fill:#00000000;stroke:#00000000;stroke-width:0;stroke-antialiasing:false" d="
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"/>
</g>
</svg>
'

[fmw42]

I do not know if this is significant, but your file has a single quote at the start and end that mine does not have. Try removing them.

[cva]

Single quotes certainly are significant. Without them in clip.svg, the convert command line works fine (no crash & watch.png is created). Not sure why the single quotes are there. The following command line has single quotes in the ImageMagick output (i.e. first char & last char):

Code: Select all

identify.exe -format '%[8BIM:1999,2998:#1]' watch.tif

[dlemstra]

Under Windows you can just do this, you don't need the quotes:

Code: Select all

identify -format %[8BIM:1999,2998:#1] watch.tif > clip.svg

I was able to run the commands without Inkscape installed.

[cva]

You're right. Without quotes works fine and fixes the problem. Thanks!

So, I'm down to these two commands:

Code: Select all

identify.exe -format %[8BIM:1999,2998:#1] watch.tif > clip.svg
convert.exe watch.tif -alpha off clip.svg -compose copy_opacity -composite watch.png

I get a resulting watch.png - but it does not contain transparency that I am after (see original post - i.e. the negated clip path should be transparent). What I am doing wrong?

[fmw42]

Nothing. My mistake. Sorry. I did not note the transparency, since your PS png output showed none when displayed in my browser, only a white background. However, when I download it and view it another tool, it does show transparency. If I correct my command it comes out looking just like using -clip.

Code: Select all

convert watch.tif \
-profile /Users/fred/images/Profiles/USWebCoatedSWOP.icc \
-profile /Users/fred/images/Profiles/sRGB.icc \
\( clip.svg -negate \) -alpha off -compose copy_opacity -composite watch4.png

It is interesting, but the clip path seems to show the same bad outline.

Code: Select all

convert clip.svg -negate clip.png

If I open your file in PS, I see several paths, but none of them match the clip path that IM sees. Perhaps PS has its paths somewhere else and IM is not accessing the same paths.

I do not know enough about PS paths to suggest what might be going on. Perhaps another user may be able to advise further.

[cva]

Many thanks - transparency is working better now.

As you point out, the original problem still remains regarding the difference between the clip paths that Photoshop sees and what ImageMagick sees. Hopefully someone can provide some insight or alternative method.

[fmw42]

The only other thing I can think of is to install Inkscape and have IM use that rather than RSVG.

Perhaps user snibgo can test tomorrow on his Windows platform where I think he has Inkscape. He knows more about clip paths and SVG than I do.