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Adjusting the display settings seems to work.


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The trick here is to increase the density(resolution) of the original image before doing any other processing like resizing or rotating. % convert -density 300 inputfile.png inputfile.png Normally, it would be necessary to specify the units (-units PixelsPerInch or -units PixelsPerCentimeter) along with density, but since PNG files only use the pixels /cm ...


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Probably the easiest sequence of steps: Copy masked image in Keynote Cmd+N in Preview Cmd+C Paste in Keynote


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I find that exporting as jpeg keeps sufficient quality and reduces the size markedly. I usually crop using the screen editor / grab (cmnd shift 4) then open in preview and export as jpeg.


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You can achieve this using the sips command. First, store your icon as follows: In an image file of size 1024 x 1024 pixels In png format In a file named Icon1024.png Then execute the following commands mkdir MyIcon.iconset sips -z 16 16 Icon1024.png --out MyIcon.iconset/icon_16x16.png sips -z 32 32 Icon1024.png --out MyIcon.iconset/icon_16x16@2x....


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