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Add notes for 2022-10-09

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Alan Orth
2022-10-09 21:19:38 +03:00
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@ -452,4 +452,20 @@ $ wc -l /tmp/*mappings.csv
- I ran both `FixJpgJpgThumbnails` and `FixLowQualityThumbnails` on a dozen or so large collections on CGSpace and processed about 1,200 low-quality thumbnails
- I did a complete re-sync of CGSpace to DSpace Test
## 2022-10-08
- Start a harvest on AReS
- Experiment with PDF thumbnails in ImageMagick again, I found an [interesting reference on their legacy website](https://legacy.imagemagick.org/Usage/thumbnails/) saying we can use `-unsharp` after `-thumbnail` to make them less blurry
- There are a few examples for unsharp values (starting from a DSpace default of a flattened JPEG from the PDF, then the thumbnail in a second operation:
```console
$ convert '10568-103447.pdf[0]' -flatten 10568-103447-dspace-step1.pdf.jpg
$ convert 10568-103447-dspace-step1.pdf.jpg -thumbnail 600x600 -unsharp 0x.5 10568-103447-dspace-step2-600-unsharp.pdf.jpg
$ convert 10568-103447-dspace-step1.pdf.jpg -thumbnail 600x600 -unsharp 2x0.5+0.7+0 10568-103447-dspace-step2-600-unsharp2.pdf.jpg
$ convert 10568-103447-dspace-step1.pdf.jpg -thumbnail 600x600 -unsharp 0x0.75+0.75+0.008 10568-103447-dspace-step2-600-unsharp3.pdf.jpg
$ convert 10568-103447-dspace-step1.pdf.jpg -thumbnail 600x600 -unsharp 1.5x1+0.7+0.02 10568-103447-dspace-step2-600-unsharp4.pdf.jpg
```
- I merged all the changes from `6_x-dev` to `6_x-prod` after having run them on DSpace Test for the last ten days
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