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README.adoc: improve docs about screenshots

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Dietmar Maurer 2016-11-08 08:11:21 +01:00
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@ -256,6 +256,25 @@ screenshot by setting the 'thumbnail' attribute on a paragraph:
First, it should be noted ... First, it should be noted ...
---- ----
The corresponding file need to reside inside folder
`images/screenshot`, and should be in `.png` image format. We include
the screenshots in printed documentation, and 'pdftex' uses the
density (DPI) specified inside the file. So all screenshots should use
the same density. We currently require the density set to 146 DPI, so
that we can display a 1024 pixels wide image. You should not include
larger screenshots (although it is possible).
You can use the `./png-cleanup.pl` script to set the correct
density. Simply use the following command to import a screenshot
image:
----
# ./png-cleanup.pl screenshot.png images/screenshot/screenshot.png
----
TIP: You can use `identify -verbose screenshot.png` command to show
all image attributes (from debian package 'imagemagick')