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--- commands-general-tools [2020/05/12 01:49]
alex [File Stuff] view contents of ZIP or TAR files without complete extracting
+++ commands-general-tools [2020/07/11 11:22] (aktuell)
alex [Conversion Stuff] add rounded corners to an image (for app icon with rounded corners in the style of iPhone‘s SpringBoard)
@@ Zeile 275: / Zeile 275: @@
 </code>
 [[https://www.freebsd.org/cgi/man.cgi?query=exiftool&sektion=1|exiftool(1)]] [[https://www.freebsd.org/cgi/man.cgi?query=mogrify&sektion=1|mogrify(1)]] [[https://www.freebsd.org/cgi/man.cgi?query=ImageMagick&sektion=1|ImageMagick(1)]]
+=== add rounded corners to an image (for app icon with rounded corners in the style of iPhone‘s SpringBoard) ===
+<code bash>
+### Adjust the corner radius (in pixel) to your needs.
+### For a 1024x1024 image a value of 128 looks good.
+RADIUS=128
+### The whole ImageMagick command is quite complex. The resulting rounded image is written to a new file.
+### The cascade of parenthesized options defines the operations to cut out the transparent arcs in the corners.
+convert AppIconRaw.png \( +clone -alpha extract \
+  \( -size ${RADIUS}x${RADIUS} xc:black -draw "fill white circle ${RADIUS},${RADIUS} ${RADIUS},0" -write mpr:arc +delete \) \
+  \( mpr:arc \) -gravity northwest -composite \
+  \( mpr:arc -flip \) -gravity southwest -composite \
+  \( mpr:arc -flop \) -gravity northeast -composite \
+  \( mpr:arc -rotate 180 \) -gravity southeast -composite \) \
+  -alpha off -compose CopyOpacity -composite AppIconRounded.png
+</code>
+[[https://www.freebsd.org/cgi/man.cgi?query=convert&sektion=1|convert(1)]] [[https://www.freebsd.org/cgi/man.cgi?query=ImageMagick&sektion=1|ImageMagick(1)]] [[https://imagemagick.org/script/command-line-processing.php|ImageMagick - Command-line Processing]] [[http://www.imagemagick.org/script/command-line-options.php|ImageMagick - Command-line Options]]
 === Unix timestamp to human readable time ===

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