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Add notes for 2018-12-03
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@ -80,4 +80,61 @@ or(
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)
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```
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## 2018-12-03
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- I looked at the DSpace Ghostscript issue more and it seems to only affect certain PDFs...
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- I can successfully generate a thumbnail for another recent item ([10568/98394](https://hdl.handle.net/10568/98394)), but not for [10568/98930](https://hdl.handle.net/10568/98390)
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- Even manually on my Arch Linux desktop with ghostscript 9.26-1 and the `pngalpha` device, I can generate a thumbnail for the first one (10568/98394):
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```
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$ gs -q -dQUIET -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dMaxBitmap=500000000 -dAlignToPixels=0 -dGridFitTT=2 -sDEVICE=pngalpha -dTextAlphaBits=4 -dGraphicsAlphaBits=4 -r72x72 -dFirstPage=1 -dLastPage=1 -sOutputFile=/tmp/out%d -f/home/aorth/Desktop/Info\ Note\ Mainstreaming\ gender\ and\ social\ differentiation\ into\ CCAFS\ research\ activities\ in\ West\ Africa-converted.pdf
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```
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- So it seems to be something about the PDFs themselves, perhaps related to alpha support?
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- The first item (10568/98394) has the following information:
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```
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$ identify Info\ Note\ Mainstreaming\ gender\ and\ social\ differentiation\ into\ CCAFS\ research\ activities\ in\ West\ Africa-converted.pdf\[0\]
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Info Note Mainstreaming gender and social differentiation into CCAFS research activities in West Africa-converted.pdf[0]=>Info Note Mainstreaming gender and social differentiation into CCAFS research activities in West Africa-converted.pdf PDF 595x841 595x841+0+0 16-bit sRGB 107443B 0.000u 0:00.000
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identify: CorruptImageProfile `xmp' @ warning/profile.c/SetImageProfileInternal/1746.
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```
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- And wow, I can't even run ImageMagick's `identify` on the first page of the second item (10568/98930):
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```
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$ identify Food\ safety\ Kenya\ fruits.pdf\[0\]
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zsh: abort (core dumped) identify Food\ safety\ Kenya\ fruits.pdf\[0\]
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```
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- But with GraphicsMagick's `identify` it works:
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```
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$ gm identify Food\ safety\ Kenya\ fruits.pdf\[0\]
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DEBUG: FC_WEIGHT didn't match
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Food safety Kenya fruits.pdf PDF 612x792+0+0 DirectClass 8-bit 1.4Mi 0.000u 0m:0.000002s
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```
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- Interesting that ImageMagick's `identify` *does* work if you do not specify a page, perhaps as [alluded to in the recent Ghostscript bug report](https://bugs.ghostscript.com/show_bug.cgi?id=699815):
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```
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$ identify Food\ safety\ Kenya\ fruits.pdf
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Food safety Kenya fruits.pdf[0] PDF 612x792 612x792+0+0 16-bit sRGB 64626B 0.010u 0:00.009
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Food safety Kenya fruits.pdf[1] PDF 612x792 612x792+0+0 16-bit sRGB 64626B 0.010u 0:00.009
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Food safety Kenya fruits.pdf[2] PDF 612x792 612x792+0+0 16-bit sRGB 64626B 0.010u 0:00.009
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Food safety Kenya fruits.pdf[3] PDF 612x792 612x792+0+0 16-bit sRGB 64626B 0.010u 0:00.009
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Food safety Kenya fruits.pdf[4] PDF 612x792 612x792+0+0 16-bit sRGB 64626B 0.010u 0:00.009
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identify: CorruptImageProfile `xmp' @ warning/profile.c/SetImageProfileInternal/1746.
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```
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- As I expected, ImageMagick cannot generate a thumbnail, but GraphicsMagick can (though it looks like crap):
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```
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$ convert Food\ safety\ Kenya\ fruits.pdf\[0\] -thumbnail 600x600 -flatten Food\ safety\ Kenya\ fruits.pdf.jpg
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zsh: abort (core dumped) convert Food\ safety\ Kenya\ fruits.pdf\[0\] -thumbnail 600x600 -flatten
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$ gm convert Food\ safety\ Kenya\ fruits.pdf\[0\] -thumbnail 600x600 -flatten Food\ safety\ Kenya\ fruits.pdf.jpg
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DEBUG: FC_WEIGHT didn't match
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```
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- I inspected the troublesome PDF using [jhove](http://jhove.openpreservation.org/) and noticed that it is using `ISO PDF/A-1, Level B` and the other one doesn't list a profile, though I don't think this is relevant
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<!-- vim: set sw=2 ts=2: -->
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@ -21,7 +21,7 @@ I noticed that there is another issue with PDF thumbnails on CGSpace, and I see
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" />
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<meta property="og:type" content="article" />
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<meta property="og:url" content="https://alanorth.github.io/cgspace-notes/2018-12/" /><meta property="article:published_time" content="2018-12-02T02:09:30+02:00"/>
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<meta property="article:modified_time" content="2018-12-02T10:57:41+02:00"/>
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<meta property="article:modified_time" content="2018-12-02T17:55:32+02:00"/>
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<meta name="twitter:card" content="summary"/>
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<meta name="twitter:title" content="December, 2018"/>
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@ -48,9 +48,9 @@ I noticed that there is another issue with PDF thumbnails on CGSpace, and I see
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"@type": "BlogPosting",
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"headline": "December, 2018",
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"url": "https://alanorth.github.io/cgspace-notes/2018-12/",
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"wordCount": "463",
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"wordCount": "875",
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"datePublished": "2018-12-02T02:09:30+02:00",
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"dateModified": "2018-12-02T10:57:41+02:00",
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"dateModified": "2018-12-02T17:55:32+02:00",
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"author": {
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"@type": "Person",
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"name": "Alan Orth"
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@ -200,6 +200,71 @@ DEBUG: FC_WEIGHT didn't match
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)
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</code></pre>
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<h2 id="2018-12-03">2018-12-03</h2>
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<ul>
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<li>I looked at the DSpace Ghostscript issue more and it seems to only affect certain PDFs…</li>
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<li>I can successfully generate a thumbnail for another recent item (<a href="https://hdl.handle.net/10568/98394"><sup>10568</sup>⁄<sub>98394</sub></a>), but not for <a href="https://hdl.handle.net/10568/98390"><sup>10568</sup>⁄<sub>98930</sub></a></li>
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<li>Even manually on my Arch Linux desktop with ghostscript 9.26-1 and the <code>pngalpha</code> device, I can generate a thumbnail for the first one (<sup>10568</sup>⁄<sub>98394</sub>):</li>
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</ul>
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<pre><code>$ gs -q -dQUIET -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dMaxBitmap=500000000 -dAlignToPixels=0 -dGridFitTT=2 -sDEVICE=pngalpha -dTextAlphaBits=4 -dGraphicsAlphaBits=4 -r72x72 -dFirstPage=1 -dLastPage=1 -sOutputFile=/tmp/out%d -f/home/aorth/Desktop/Info\ Note\ Mainstreaming\ gender\ and\ social\ differentiation\ into\ CCAFS\ research\ activities\ in\ West\ Africa-converted.pdf
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</code></pre>
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<ul>
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<li>So it seems to be something about the PDFs themselves, perhaps related to alpha support?</li>
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<li>The first item (<sup>10568</sup>⁄<sub>98394</sub>) has the following information:</li>
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</ul>
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<pre><code>$ identify Info\ Note\ Mainstreaming\ gender\ and\ social\ differentiation\ into\ CCAFS\ research\ activities\ in\ West\ Africa-converted.pdf\[0\]
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Info Note Mainstreaming gender and social differentiation into CCAFS research activities in West Africa-converted.pdf[0]=>Info Note Mainstreaming gender and social differentiation into CCAFS research activities in West Africa-converted.pdf PDF 595x841 595x841+0+0 16-bit sRGB 107443B 0.000u 0:00.000
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identify: CorruptImageProfile `xmp' @ warning/profile.c/SetImageProfileInternal/1746.
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</code></pre>
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<ul>
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<li>And wow, I can’t even run ImageMagick’s <code>identify</code> on the first page of the second item (<sup>10568</sup>⁄<sub>98930</sub>):</li>
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</ul>
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<pre><code>$ identify Food\ safety\ Kenya\ fruits.pdf\[0\]
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zsh: abort (core dumped) identify Food\ safety\ Kenya\ fruits.pdf\[0\]
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</code></pre>
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<ul>
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<li>But with GraphicsMagick’s <code>identify</code> it works:</li>
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</ul>
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<pre><code>$ gm identify Food\ safety\ Kenya\ fruits.pdf\[0\]
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DEBUG: FC_WEIGHT didn't match
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Food safety Kenya fruits.pdf PDF 612x792+0+0 DirectClass 8-bit 1.4Mi 0.000u 0m:0.000002s
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</code></pre>
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<ul>
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<li>Interesting that ImageMagick’s <code>identify</code> <em>does</em> work if you do not specify a page, perhaps as <a href="https://bugs.ghostscript.com/show_bug.cgi?id=699815">alluded to in the recent Ghostscript bug report</a>:</li>
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</ul>
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<pre><code>$ identify Food\ safety\ Kenya\ fruits.pdf
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Food safety Kenya fruits.pdf[0] PDF 612x792 612x792+0+0 16-bit sRGB 64626B 0.010u 0:00.009
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Food safety Kenya fruits.pdf[1] PDF 612x792 612x792+0+0 16-bit sRGB 64626B 0.010u 0:00.009
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Food safety Kenya fruits.pdf[2] PDF 612x792 612x792+0+0 16-bit sRGB 64626B 0.010u 0:00.009
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Food safety Kenya fruits.pdf[3] PDF 612x792 612x792+0+0 16-bit sRGB 64626B 0.010u 0:00.009
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Food safety Kenya fruits.pdf[4] PDF 612x792 612x792+0+0 16-bit sRGB 64626B 0.010u 0:00.009
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identify: CorruptImageProfile `xmp' @ warning/profile.c/SetImageProfileInternal/1746.
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</code></pre>
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<ul>
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<li>As I expected, ImageMagick cannot generate a thumbnail, but GraphicsMagick can (though it looks like crap):</li>
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</ul>
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<pre><code>$ convert Food\ safety\ Kenya\ fruits.pdf\[0\] -thumbnail 600x600 -flatten Food\ safety\ Kenya\ fruits.pdf.jpg
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zsh: abort (core dumped) convert Food\ safety\ Kenya\ fruits.pdf\[0\] -thumbnail 600x600 -flatten
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$ gm convert Food\ safety\ Kenya\ fruits.pdf\[0\] -thumbnail 600x600 -flatten Food\ safety\ Kenya\ fruits.pdf.jpg
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DEBUG: FC_WEIGHT didn't match
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</code></pre>
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<ul>
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<li>I inspected the troublesome PDF using <a href="http://jhove.openpreservation.org/">jhove</a> and noticed that it is using <code>ISO PDF/A-1, Level B</code> and the other one doesn’t list a profile, though I don’t think this is relevant</li>
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</ul>
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<!-- vim: set sw=2 ts=2: -->
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@ -4,7 +4,7 @@
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<url>
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<loc>https://alanorth.github.io/cgspace-notes/2018-12/</loc>
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<lastmod>2018-12-02T10:57:41+02:00</lastmod>
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<lastmod>2018-12-02T17:55:32+02:00</lastmod>
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</url>
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<url>
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@ -199,7 +199,7 @@
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<url>
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<loc>https://alanorth.github.io/cgspace-notes/</loc>
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<lastmod>2018-12-02T10:57:41+02:00</lastmod>
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<lastmod>2018-12-02T17:55:32+02:00</lastmod>
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<priority>0</priority>
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</url>
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@ -210,7 +210,7 @@
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<url>
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<loc>https://alanorth.github.io/cgspace-notes/tags/notes/</loc>
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<lastmod>2018-12-02T10:57:41+02:00</lastmod>
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<lastmod>2018-12-02T17:55:32+02:00</lastmod>
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<priority>0</priority>
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</url>
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@ -222,13 +222,13 @@
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<url>
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<loc>https://alanorth.github.io/cgspace-notes/posts/</loc>
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<lastmod>2018-12-02T10:57:41+02:00</lastmod>
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<lastmod>2018-12-02T17:55:32+02:00</lastmod>
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<priority>0</priority>
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</url>
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<url>
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<loc>https://alanorth.github.io/cgspace-notes/tags/</loc>
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<lastmod>2018-12-02T10:57:41+02:00</lastmod>
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<lastmod>2018-12-02T17:55:32+02:00</lastmod>
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<priority>0</priority>
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</url>
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