March, 2017

Wed Mar 01, 2017 by Alan Orth in Notes

2017-03-01

Run the 279 CIAT author corrections on CGSpace

2017-03-02

Skype with Michael and Peter, discussing moving the CGIAR Library to CGSpace
CGIAR people possibly open to moving content, redirecting library.cgiar.org to CGSpace and letting CGSpace resolve their handles
They might come in at the top level in one “CGIAR System” community, or with several communities
I need to spend a bit of time looking at the multiple handle support in DSpace and see if new content can be minted in both handles, or just one?
Need to send Peter and Michael some notes about this in a few days
Also, need to consider talking to Atmire about hiring them to bring ORCiD metadata to REST / OAI
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 ¹⁰⁵⁶⁸⁄₅₁₉₉₉):

$ 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

This results in discolored thumbnails when compared to the original PDF, for example sRGB and CMYK:

I filed an issue for the color space thing: DS-3517

2017-03-03

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

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

This reads the input file, applies the CMYK profile, applies the RGB profile, then writes the file
Note that you should set the first profile immediately after the input file
Also, it is better to use profiles than setting -colorspace
This is a great resource describing the color stuff: http://www.imagemagick.org/Usage/formats/#profiles
Somehow we need to detect the color system being used by the input file and handle each case differently (with profiles)
This is trivial with identify (even by the Java ImageMagick API):

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