JAL-3594 New Jalview Test logos and .icns/.ico creation helper script

[jalview.git] / utils / install4j / README_convert_PNG_to_ICNS_and_ICO

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-## Creating the .ico (Windows) and .icns (macOS) files from PNG images in linux
-
-Create multiple square versions of your icon at the following resolutions:
-16x16, 32x32, 48x48, 64x64, 128x128, 256x256, 512x512
-
-> A quick way to do this with ImageMagick is create the 512x512 logo first, saved as logo-512.png, and run
-> `for n in 16 32 48 64 128 256; do convert -geometry ${n}x${n} logo-512.png logo-${n}.png; done`
-> but note that anitaliasing can make a logo look quite blurry, especially for small resolutions.  These should
-> then be hand edited (with e.g. gimp) to neaten the edges.  A nice trick in gimp is to use the Colours->Curves->Alpha
-> and create a curve that makes mostly transparent pixels completely transparent, and slightly transparent pixels
-> completely opaque.
-
-Then use the script `jalview/utils/create_iconfiles.sh` like this:
-```
-create_iconfiles.sh logo-*.png
-```
-and it will create both `logo.ico` and `logo.icns` containing the appropriate different resolution logos.
-It is then up to the OS to display the correct one in different circumstances.
-
-This script uses the utilities convert (ImageMagick) and png2icns (icnsutils) which should be installed and in the path.
-Note that for some reason ICNS files should not contain a 64x64 pixel version of a logo, so the script removes this
-as png2icns complains if it finds one!
-
-### Rotatable icon with white background
-
-This icon is used by the web services progress window, with the rotating Jalview logo.
-It requires some small margin of white pixels around the logo to enable antialiasing around the edge of the logo.
-You can make one form a 38x38 transparent logo with
-```
-convert jalview_logo-38.png -gravity center -background white -extent 60x60 rotatable_jalview_logo-38.png
-```