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Run the 279 CIAT author corrections on CGSpace


2017-03-02


Filed an issue on DSpace issue tracker for the filter-media bug that causes it to process JPGs even when limiting to the PDF thumbnail plugin: DS-3516
Discovered that the ImageMagic filter-media plugin creates JPG thumbnails with the CMYK colorspace when the source PDF is using CMYK
Interestingly, it seems DSpace 4.x&rsquo;s thumbnails were sRGB, but forcing regeneration using DSpace 5.x&rsquo;s ImageMagick plugin creates CMYK JPGs if the source PDF was CMYK (see 10568&frasl;51999):


$ identify ~/Desktop/alc_contrastes_desafios.jpg
/Users/aorth/Desktop/alc_contrastes_desafios.jpg JPEG 464x600 464x600&#43;0&#43;0 8-bit CMYK 168KB 0.000u 0:00.000


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Run the 279 CIAT author corrections on CGSpace


2017-03-02


Filed an issue on DSpace issue tracker for the filter-media bug that causes it to process JPGs even when limiting to the PDF thumbnail plugin: DS-3516
Discovered that the ImageMagic filter-media plugin creates JPG thumbnails with the CMYK colorspace when the source PDF is using CMYK
Interestingly, it seems DSpace 4.x&rsquo;s thumbnails were sRGB, but forcing regeneration using DSpace 5.x&rsquo;s ImageMagick plugin creates CMYK JPGs if the source PDF was CMYK (see 10568&frasl;51999):


$ identify ~/Desktop/alc_contrastes_desafios.jpg
/Users/aorth/Desktop/alc_contrastes_desafios.jpg JPEG 464x600 464x600&#43;0&#43;0 8-bit CMYK 168KB 0.000u 0:00.000


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    <p class="blog-post-meta"><time datetime="2017-03-01T17:08:52&#43;02:00">Wed Mar 01, 2017</time> by Alan Orth in 

<i class="fa fa-tag" aria-hidden="true"></i>&nbsp;<a href="/cgspace-notes/tags/notes" rel="tag">Notes</a>

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  </header>
  <h2 id="2017-03-01">2017-03-01</h2>

<ul>
<li>Run the 279 CIAT author corrections on CGSpace</li>
</ul>

<h2 id="2017-03-02">2017-03-02</h2>

<ul>
<li>Filed an issue on DSpace issue tracker for the <code>filter-media</code> bug that causes it to process JPGs even when limiting to the PDF thumbnail plugin: <a href="https://jira.duraspace.org/browse/DS-3516">DS-3516</a></li>
<li>Discovered that the ImageMagic <code>filter-media</code> plugin creates JPG thumbnails with the CMYK colorspace when the source PDF is using CMYK</li>
<li>Interestingly, it seems DSpace 4.x&rsquo;s thumbnails were sRGB, but forcing regeneration using DSpace 5.x&rsquo;s ImageMagick plugin creates CMYK JPGs if the source PDF was CMYK (see <a href="https://cgspace.cgiar.org/handle/10568/51999"><sup>10568</sup>&frasl;<sub>51999</sub></a>):</li>
</ul>

<pre><code>$ identify ~/Desktop/alc_contrastes_desafios.jpg
/Users/aorth/Desktop/alc_contrastes_desafios.jpg JPEG 464x600 464x600+0+0 8-bit CMYK 168KB 0.000u 0:00.000
</code></pre>

<p></p>

<ul>
<li>This results in discolored thumbnails when compared to the original PDF, for example sRGB and CMYK:</li>
</ul>

<p><img src="/cgspace-notes/2017/03/thumbnail-srgb.jpg" alt="Thumbnail in sRGB colorspace" /></p>

<p><img src="/cgspace-notes/2017/03/thumbnail-cmyk.jpg" alt="Thumbnial in CMYK colorspace" /></p>

<ul>
<li>I filed an issue for the color space thing: <a href="https://jira.duraspace.org/browse/DS-3517">DS-3517</a></li>
</ul>

<h2 id="2017-03-03">2017-03-03</h2>

<ul>
<li>I created a patch for DS-3517 and made a pull request against upstream <code>dspace-5_x</code>: <a href="https://github.com/DSpace/DSpace/pull/1669">https://github.com/DSpace/DSpace/pull/1669</a></li>
<li>Looks like <code>-colorspace sRGB</code> alone isn&rsquo;t enough, we need to use profiles:</li>
</ul>

<pre><code>$ convert -thumbnail 300x300 -flatten -profile /opt/brew/Cellar/ghostscript/9.20/share/ghostscript/9.20/iccprofiles/default_cmyk.icc -profile /opt/brew/Cellar/ghostscript/9.20/share/ghostscript/9.20/iccprofiles/default_rgb.icc alc_contrastes_desafios.pdf\[0\] alc_contrastes_desafios.pdf.jpg
</code></pre>

<ul>
<li>This is a great resource describing the color stuff: <a href="http://www.imagemagick.org/Usage/formats/#profiles">http://www.imagemagick.org/Usage/formats/#profiles</a></li>
<li>Somehow we need to detect the color system being used by the input file and handle each case differently</li>
<li>This is trivial with <code>identify</code> (even by the <a href="http://im4java.sourceforge.net/api/org/im4java/core/IMOps.html#identify">Java ImageMagick API</a>):</li>
</ul>

<pre><code>$ identify -format '%r\n' alc_contrastes_desafios.pdf\[0\]
DirectClass CMYK
$ identify -format '%r\n' Africa\ group\ of\ negotiators.pdf\[0\]
DirectClass sRGB Alpha
</code></pre>

  
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Add notes for 2017-03-01 2017-03-01 16:10:08 +01:00			`<!DOCTYPE html>`
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			`Run the 279 CIAT author corrections on CGSpace`


Add notes for 2017-03-02 2017-03-02 18:26:39 +01:00			`2017-03-02`


			`Filed an issue on DSpace issue tracker for the filter-media bug that causes it to process JPGs even when limiting to the PDF thumbnail plugin: DS-3516`
			`Discovered that the ImageMagic filter-media plugin creates JPG thumbnails with the CMYK colorspace when the source PDF is using CMYK`
			`Interestingly, it seems DSpace 4.x’s thumbnails were sRGB, but forcing regeneration using DSpace 5.x’s ImageMagick plugin creates CMYK JPGs if the source PDF was CMYK (see 10568&frasl;51999):`


			`$ identify ~/Desktop/alc_contrastes_desafios.jpg`
			`/Users/aorth/Desktop/alc_contrastes_desafios.jpg JPEG 464x600 464x600+0+0 8-bit CMYK 168KB 0.000u 0:00.000`


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			`Run the 279 CIAT author corrections on CGSpace`


Add notes for 2017-03-02 2017-03-02 18:26:39 +01:00			`2017-03-02`


			`Filed an issue on DSpace issue tracker for the filter-media bug that causes it to process JPGs even when limiting to the PDF thumbnail plugin: DS-3516`
			`Discovered that the ImageMagic filter-media plugin creates JPG thumbnails with the CMYK colorspace when the source PDF is using CMYK`
			`Interestingly, it seems DSpace 4.x’s thumbnails were sRGB, but forcing regeneration using DSpace 5.x’s ImageMagick plugin creates CMYK JPGs if the source PDF was CMYK (see 10568&frasl;51999):`


			`$ identify ~/Desktop/alc_contrastes_desafios.jpg`
			`/Users/aorth/Desktop/alc_contrastes_desafios.jpg JPEG 464x600 464x600+0+0 8-bit CMYK 168KB 0.000u 0:00.000`


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			`<p class="blog-post-meta"><time datetime="2017-03-01T17:08:52+02:00">Wed Mar 01, 2017</time> by Alan Orth in`

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			`<h2 id="2017-03-01">2017-03-01</h2>`

			`<ul>`
			`<li>Run the 279 CIAT author corrections on CGSpace</li>`
			`</ul>`

Add notes for 2017-03-02 2017-03-02 18:26:39 +01:00			`<h2 id="2017-03-02">2017-03-02</h2>`

			`<ul>`
			`<li>Filed an issue on DSpace issue tracker for the <code>filter-media</code> bug that causes it to process JPGs even when limiting to the PDF thumbnail plugin: <a href="https://jira.duraspace.org/browse/DS-3516">DS-3516</a></li>`
			`<li>Discovered that the ImageMagic <code>filter-media</code> plugin creates JPG thumbnails with the CMYK colorspace when the source PDF is using CMYK</li>`
			`<li>Interestingly, it seems DSpace 4.x’s thumbnails were sRGB, but forcing regeneration using DSpace 5.x’s ImageMagick plugin creates CMYK JPGs if the source PDF was CMYK (see <a href="https://cgspace.cgiar.org/handle/10568/51999"><sup>10568</sup>&frasl;<sub>51999</sub></a>):</li>`
			`</ul>`

			`<pre><code>$ identify ~/Desktop/alc_contrastes_desafios.jpg`
			`/Users/aorth/Desktop/alc_contrastes_desafios.jpg JPEG 464x600 464x600+0+0 8-bit CMYK 168KB 0.000u 0:00.000`
			`</code></pre>`

Update notes for 2017-03-02 2017-03-02 19:00:18 +01:00			`<p></p>`

Add notes for 2017-03-02 2017-03-02 18:26:39 +01:00			`<ul>`
Update notes for 2017-03-03 2017-03-03 17:40:38 +01:00			`<li>This results in discolored thumbnails when compared to the original PDF, for example sRGB and CMYK:</li>`
Add notes for 2017-03-02 2017-03-02 18:26:39 +01:00			`</ul>`

Update notes for 2017-03-02 2017-03-02 19:00:18 +01:00			`<p><img src="/cgspace-notes/2017/03/thumbnail-srgb.jpg" alt="Thumbnail in sRGB colorspace" /></p>`

Update notes for 2017-03-02 2017-03-02 23:57:37 +01:00			`<p><img src="/cgspace-notes/2017/03/thumbnail-cmyk.jpg" alt="Thumbnial in CMYK colorspace" /></p>`
Add notes for 2017-03-01 2017-03-01 16:10:08 +01:00
Update notes for 2017-03-02 2017-03-03 00:32:54 +01:00			`<ul>`
			`<li>I filed an issue for the color space thing: <a href="https://jira.duraspace.org/browse/DS-3517">DS-3517</a></li>`
			`</ul>`

Update notes for 2017-03-03 2017-03-03 17:40:38 +01:00			`<h2 id="2017-03-03">2017-03-03</h2>`

			`<ul>`
			`<li>I created a patch for DS-3517 and made a pull request against upstream <code>dspace-5_x</code>: <a href="https://github.com/DSpace/DSpace/pull/1669">https://github.com/DSpace/DSpace/pull/1669</a></li>`
			`<li>Looks like <code>-colorspace sRGB</code> alone isn’t enough, we need to use profiles:</li>`
			`</ul>`

			`<pre><code>$ convert -thumbnail 300x300 -flatten -profile /opt/brew/Cellar/ghostscript/9.20/share/ghostscript/9.20/iccprofiles/default_cmyk.icc -profile /opt/brew/Cellar/ghostscript/9.20/share/ghostscript/9.20/iccprofiles/default_rgb.icc alc_contrastes_desafios.pdf\[0\] alc_contrastes_desafios.pdf.jpg`
			`</code></pre>`

			`<ul>`
			`<li>This is a great resource describing the color stuff: <a href="http://www.imagemagick.org/Usage/formats/#profiles">http://www.imagemagick.org/Usage/formats/#profiles</a></li>`
			`<li>Somehow we need to detect the color system being used by the input file and handle each case differently</li>`
			`<li>This is trivial with <code>identify</code> (even by the <a href="http://im4java.sourceforge.net/api/org/im4java/core/IMOps.html#identify">Java ImageMagick API</a>):</li>`
			`</ul>`

			`<pre><code>$ identify -format '%r\n' alc_contrastes_desafios.pdf\[0\]`
			`DirectClass CMYK`
			`$ identify -format '%r\n' Africa\ group\ of\ negotiators.pdf\[0\]`
			`DirectClass sRGB Alpha`
			`</code></pre>`

Add notes for 2017-03-01 2017-03-01 16:10:08 +01:00



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