GraphicsMagick corrupts TIFF upon PDF conversion

GraphicsMagick corrupts TIFF upon PDF conversion

[Thangalin]

FYI, there appears to be a bug with GraphicsMagick.

gm convert -density 600x600 illustration.tif m_k_i_v_illustration.tif.pdf

Produces:

38812848 Dec 15 22:51 m_k_i_v_illustration.tif.pdf
https://i.imgur.com/EByrH6r.png

Whereas ImageMagck:

convert -density 600x600 illustration.tif m_k_i_v_illustration.tif.pdf

Produces:

42343236 Dec 15 22:52 m_k_i_v_illustration.tif.pdf
https://i.imgur.com/9DxRVW2.png

Re: https://wiki.contextgarden.net/Using_Graphics#Image_Conversion

Since GraphicsMagick is used by ConTeXt, is there a way to force
ConTeXt to use ImageMagick instead?

Thank you!
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Re: GraphicsMagick corrupts TIFF upon PDF conversion

[Hans Hagen]

On 12/16/2019 7:59 AM, Thangalin wrote:
> FYI, there appears to be a bug with GraphicsMagick.
> 
> gm convert -density 600x600 illustration.tif m_k_i_v_illustration.tif.pdf
> 
> Produces:
> 
> 38812848 Dec 15 22:51 m_k_i_v_illustration.tif.pdf
> https://i.imgur.com/EByrH6r.png
> 
> Whereas ImageMagck:
> 
> convert -density 600x600 illustration.tif m_k_i_v_illustration.tif.pdf
> 
> Produces:
> 
> 42343236 Dec 15 22:52 m_k_i_v_illustration.tif.pdf
> https://i.imgur.com/9DxRVW2.png
> 
> Re: https://wiki.contextgarden.net/Using_Graphics#Image_Conversion
> 
> Since GraphicsMagick is used by ConTeXt, is there a way to force
> ConTeXt to use ImageMagick instead?
something like this

\startluacode

figures.converters["jpg"]["lowres.jpg"] = 
function(oldname,newname,resolution)
     os.execute(string.format(
       'gm convert -density %ix%i "%s" "%s"',
       resolution,resolution,oldname,newname))
end

\stopluacode

\starttext
     \externalfigure
       [t:/sources/hacker.jpg]
       [conversion=lowres.jpg,resolution=50,width=10cm]
\stoptext

with gm replaced by whatever is needed to call imagemagick

Hans

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