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Update notes for 2021-08-09

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Alan Orth 2021-08-09 17:34:13 +03:00
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content/posts/2021-08.md
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@ -210,5 +210,20 @@ if(cells['sherpa romeo journal title'].value == cells['crossref journal title'].
- It is faster and uses less memory than GraphicsMagick (and ImageMagick), and produces nice thumbnails from PDFs
- One drawback is that libvips uses Poppler instead of Graphicsmagick, which apparently means that it can't work in CMYK
- I tested one item (10568/51999) that uses CMYK and the thumbnail looked OK (closer to the original than GraphicsMagick), so I'm not sure...
- I did some tests of the memory used and time elapsed with libvips, GraphicsMagick, and ImageMagick:
```console
$ /usr/bin/time -f %M:%e vipsthumbnail IPCC.pdf -s 600 -o '%s-vips.jpg[Q=85,optimize_coding,strip]'
39004:0.08
$ /usr/bin/time -f %M:%e gm convert IPCC.pdf\[0\] -quality 85 -thumbnail x600 -flatten IPCC-gm.jpg
40932:0.53
$ /usr/bin/time -f %M:%e convert IPCC.pdf\[0\] -flatten -profile /usr/share/ghostscript/9.54.0/iccprofiles/default_cmyk.icc -profile /usr/share/ghostscript/9.54.0/iccprofiles/default_rgb.icc /tmp/impdfthumb2862933674765647409.pdf.jpg
41724:0.59
$ /usr/bin/time -f %M:%e convert -auto-orient /tmp/impdfthumb2862933674765647409.pdf.jpg -quality 85 -thumbnail 600x600 IPCC-im.jpg
24736:0.04
```
- The ImageMagick way is the same as how DSpace does it (first creating an intermediary image, then getting a thumbnail)
- libvips does use less time and memory... I should do more tests!
<!-- vim: set sw=2 ts=2: -->

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@ -18,7 +18,7 @@ I decided to upgrade linode20 from Ubuntu 18.04 to 20.04
<meta property="og:type" content="article" />
<meta property="og:url" content="https://alanorth.github.io/cgspace-notes/2021-08/" />
<meta property="article:published_time" content="2021-08-01T09:01:07+03:00" />
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<meta property="article:modified_time" content="2021-08-09T17:10:45+03:00" />
@ -42,9 +42,9 @@ I decided to upgrade linode20 from Ubuntu 18.04 to 20.04
"@type": "BlogPosting",
"headline": "August, 2021",
"url": "https://alanorth.github.io/cgspace-notes/2021-08/",
"wordCount": "1537",
"wordCount": "1636",
"datePublished": "2021-08-01T09:01:07+03:00",
"dateModified": "2021-08-09T08:38:44+03:00",
"dateModified": "2021-08-09T17:10:45+03:00",
"author": {
"@type": "Person",
"name": "Alan Orth"
@ -329,6 +329,22 @@ $ csvjoin -c issn /tmp/2021-08-09-journals-sherpa-romeo.csv /tmp/2021-08-09-jour
<li>I tested one item (10568/51999) that uses CMYK and the thumbnail looked OK (closer to the original than GraphicsMagick), so I&rsquo;m not sure&hellip;</li>
</ul>
</li>
<li>I did some tests of the memory used and time elapsed with libvips, GraphicsMagick, and ImageMagick:</li>
</ul>
<pre><code class="language-console" data-lang="console">$ /usr/bin/time -f %M:%e vipsthumbnail IPCC.pdf -s 600 -o '%s-vips.jpg[Q=85,optimize_coding,strip]'
39004:0.08
$ /usr/bin/time -f %M:%e gm convert IPCC.pdf\[0\] -quality 85 -thumbnail x600 -flatten IPCC-gm.jpg
40932:0.53
$ /usr/bin/time -f %M:%e convert IPCC.pdf\[0\] -flatten -profile /usr/share/ghostscript/9.54.0/iccprofiles/default_cmyk.icc -profile /usr/share/ghostscript/9.54.0/iccprofiles/default_rgb.icc /tmp/impdfthumb2862933674765647409.pdf.jpg
41724:0.59
$ /usr/bin/time -f %M:%e convert -auto-orient /tmp/impdfthumb2862933674765647409.pdf.jpg -quality 85 -thumbnail 600x600 IPCC-im.jpg
24736:0.04
</code></pre><ul>
<li>The ImageMagick way is the same as how DSpace does it (first creating an intermediary image, then getting a thumbnail)
<ul>
<li>libvips does use less time and memory&hellip; I should do more tests!</li>
</ul>
</li>
</ul>
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<meta property="og:description" content="Documenting day-to-day work on the [CGSpace](https://cgspace.cgiar.org) repository." />
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